Articoli di riviste: "Sediment"

1

Kamiludin, Udaya, e Yudi Darlan. "KARAKTERISTIK PASIR DI PANTAI DAN LEPAS PANTAI BINUANGEUN, LEBAK-BANTEN". JURNAL GEOLOGI KELAUTAN 11, n. 2 (16 febbraio 2016): 79. http://dx.doi.org/10.32693/jgk.11.2.2013.235.

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Pasir merupakan sesuatu penomena yang menarik karena padanya tersimpan misteri bagaimana partikel itu terendapkan sesuai dengan lingkungannya, apakah merupakan pasir pada lingkungan marin, pantai atau sungai. Untuk mengetahui lingkungan pengendapan tersebut maka dilakukan identifikasi karakteristik pasirnya. Metoda penelitan meliputi pengambilan contoh, analisis besar butir, klasifikasi nomenklatur sedimen dan parameter statistik. Klasifikasi nomenklatur sedimen pada endapan sedimen permukaan dasar laut, gisik pasir, tanggul gisik dan endapan sungai aktif didapat pasir sebanyak, masing masing 19, 35, 15 dan 3 percontoh. Ke empat jenis endapan mempunyai ukuran butir rata-rata (mean) relatif seragam, yaitu pasir halus (2 Î¦ - 3 Î¦). Begitu juga ukuran pasirnya berupa pasir halus dengan kurva distribusi persen berat fluktuatif. Perbedaan terlihat pada ukuran pasir sedimen permukaan dasar laut dan sedimen sungai aktif, selain pasir halus hadir pula pasir menengah (1 Î¦ - 2 Î¦). Klasifikasi lingkungan pasir memperlihatkan bahwa ke empat endapan mempunyai kesesuaian lingkungan pengendapan disertai adanya muatan partikel yang mengkasar dan menghalus dengan bentuk kurtosis leptokurtik dan platikurtik monomodal. Sumber batuan asal sedimen diduga berasal dari hasil abrasi batugamping terumbu yang tersingkap di pantai bagian tengah daerah penelitian dan pengerjaan ulang batuan gunungapi dan batuan sedimen asal volkanik yang umum tersingkap di utara daerah penelitian. Kata Kunci : Sedimen permukaan dasar laut, gisik pasir, tanggul gisik, sedimen sungai aktif, lingkungan pengendapan pasir, sumber batuan. Sand sediment is something interesting phenomenon because the sand is stored in the mystery of how the sand particles sedimented according to the deposition environment, what is the sand that was deposited in marine, beach or river environment. The identification of sand sediment characteristic is used for the determination of depositional environment. Study methods include sediment sampling, grain size analysis of sediment, sediment nomenclature classification and computing the statistical parameters. Sediment nomenclature classification results on the seafloor surface sediment, sand beach sediment, berm sediment and active stream sediment derived as much sand sediment types, respectively 19, 35, 15 and 3 samples. The four types of sediment deposition that has mean is relatively uniform, which falls on the fine sand (Î¦ 2 - Î¦ 3). While the size of sand fall in the fine sand with fluctuating weight percent distribution curve. The difference was in the size of the sand on the sea floor sediments and active stream sediments, in addition to fine sand also present medium sand (Î¦1 - Î¦2). Sand environment classification showed that all four types of the sediments have suitability depositional environment be accompanied excess coarse and fine particles with curved kurtosis leptokurtic and platykurtic monomodal. Source rocks of the sediments probably derived from the abrasion of coralreef limestone exposed in the central coast of study area and rework volcanic rocks and sedimentary rocks of volcanic origin are commonly exposed in the northern of study area. Key words: Seafloor surface sediment, sand beach, berm, active stream sediment, sand depositional environment, source rocks.

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Ooi, Jieun Lin, Lee Woen Ean, Bashar S. Mohammed, M. A. Malek, Leong Sing Wong, Chao Wei Tang e He Qing Chua. "Study on the Properties of Compressed Bricks Using Cameron Highlands Reservoir Sediment as Primary Material". Applied Mechanics and Materials 710 (gennaio 2015): 25–29. http://dx.doi.org/10.4028/www.scientific.net/amm.710.25.

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This research is to investigate the properties of compressed building bricks producedfrom Cameron Highlands reservoir sediment. The particle size distribution of the sediments are graded as silt and sand. The sediments used were as total replacement of the normal soils used in the compressed soil bricks. This paper presents the compilation of experimental brick properties; compressive strength, water absorption, microstructure and heavy metal leachingof the compressed sediment bricks. The experimental results shows that increasing use of reservoir sediments decrease the compressive strength andincrease the water absorption. The heavy metal concentrations of the leachates from the leaching test are all within the regulatory limits. The optimum mix is derives from the compressive strength and the water absorption in which in this research is Mix 4, 70% sedimenta, 20% sedimentb and 10% cement,complying with ASTM C129 – Non Load Bearing Bricks [1].

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3

Hasteti, Mita, Tri Apriadi e Winny Retna Melani. "Komposisi dan Kepadatan Mikroplastik di Sedimen Perairan Pulau Los, Kota Tanjungpinang, Kepulauan Riau". Journal of Marine Research 12, n. 3 (23 maggio 2023): 455–64. http://dx.doi.org/10.14710/jmr.v12i3.36691.

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Penelitian ini dilatarbelakangi oleh adanya keberadaan sampah plastik di sedimen perairan Pulau Los, Kota Tanjungpinang. Tujuan dari penelitian ini adalah untuk mengetahui komposisi dan kepadatan jenis mikroplastik serta perbedaan antara nilai rata-rata kepadatan mikroplastik pada setiap jenis sedimen di Pulau Los, Kota Tanjungpinang. Penelitian ini dilaksanakan pada bulan Mei-Juli 2022. Pengambilan sampel menggunakan metode Random Sampling di 30 titik dengan satu kali pengambilan sampel. Sampel sedimen diambil menggunakan transek kuadran ukuran 0,5x0,5 m pada kedalaman 5 cm. Sampel sedimen kemudian dikeringkan dengan oven, setelah kering sampel diberi larutan H2O2 30% untuk menghancurkan bahan organik serta larutan ZnCl2 untuk memisahkan partikel mikroplastik dengan non-plastik. Selanjutnya sampel diidentifikasi di laboratorium menggunakan mikroskop stereo. Komposisi mikroplastik di sedimen berpasir dan pasir berlumpur terdiri dari jenis fiber, fragmen, dan film sedangkan untuk jenis foam dan pelet tidak dijumpai dalam penelitian ini. Kepadatan mikroplastik jenis fiber mempunyai nilai rata-rata yang lebih tinggi di sedimen pasir berlumpur yaitu sebesar 6,75 partikel/25 gram sedimen kering dibandingkan dengan sedimen berpasir yang hanya sebesar 5,83 partikel/25 gram sedimen kering. Fragmen merupakan jenis mikroplastik yang nilai rata-rata kepadatannya hampir mendekati antara sedimen pasir berlumpur yang memperoleh nilai sebesar 5,58 partikel/25 gram sedimen kering dengan sedimen berpasir sebesar 5,22 partikel/25 gram sedimen kering. Mikroplastik jenis film mempunyai nilai rata-rata kepadatan yang lebih tinggi di sedimen pasir berlumpur yaitu sebesar 5,08 partikel/25 gram sedimen kering dibandingkan dengan sedimen berpasir yang hanya sebesar 3,83 partikel/25 gram sedimen kering. Hasil uji Kruskal Wallis dan uji ANOVA menunjukkan tidak terdapat perbedaan secara nyata antara kepadatan jenis mikroplastik pada sedimen berpasir dan pasir berlumpur di Pulau Los, Kota Tanjungpinang. This research is based on the presence of plastic waste in the sediments of the waters of Los Island, Tanjungpinang City. The objective of this study was to determine the composition and density of microplastics along the differences between the average values of microplastic density in each type of sediment on Los Island, Tanjungpinang City.This research was conducted in May-July 2022. Sampling used the Random Sampling method at 30 points with one sampling. Sediment samples were taken using a 0,5x0,5 m quadrant transect at a depth of 5 cm. The sediment sample was then dried in an oven, after drying the sample was given a 30% H2O2 solution to destroy organic matter and a ZnCl2 solution to separate microplastic particles from non-microplastics. The samples were then identified in the laboratory using a stereo microscope. The composition of microplastics in sandy and muddy sand sediments consisted of fiber, fragments, and films, while foam and pellet types were not found in this study. The density of fiber-type microplastics has a higher average value in muddy sand sediments, which is 6,75 particles/25 grams of dry sediment compared to sandy sediments which are only 5,83 particles/25 grams of dry sediment. Fragments are a type of microplastic with an average density value close to that of silty sand sediments with a value of 5,58 particles/25 grams of dry sediment and sandy sediments of 5,22 particles/25 grams of dry sediment. Film-type microplastics have a higher average density value in muddy sand sediments namely 5,08 particles/25 grams of dry sediment compared to sandy sediments which are only 3,83 particles/25 grams of dry sediment. The results of the Kruskal Wallis test and the ANOVA test showed that there was no significant difference between the densities of microplastic species in sandy and muddy sand sediments on Los Island, Tanjungpinang City.

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4

Hasteti, Mita, Tri Apriadi e Winny Retna Melani. "Komposisi dan Kepadatan Mikroplastik di Sedimen Perairan Pulau Los, Kota Tanjungpinang, Kepulauan Riau". Journal of Marine Research 12, n. 3 (23 maggio 2023): 455–64. http://dx.doi.org/10.14710/jmr.v12i3.36691.

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Abstract (sommario):

Penelitian ini dilatarbelakangi oleh adanya keberadaan sampah plastik di sedimen perairan Pulau Los, Kota Tanjungpinang. Tujuan dari penelitian ini adalah untuk mengetahui komposisi dan kepadatan jenis mikroplastik serta perbedaan antara nilai rata-rata kepadatan mikroplastik pada setiap jenis sedimen di Pulau Los, Kota Tanjungpinang. Penelitian ini dilaksanakan pada bulan Mei-Juli 2022. Pengambilan sampel menggunakan metode Random Sampling di 30 titik dengan satu kali pengambilan sampel. Sampel sedimen diambil menggunakan transek kuadran ukuran 0,5x0,5 m pada kedalaman 5 cm. Sampel sedimen kemudian dikeringkan dengan oven, setelah kering sampel diberi larutan H2O2 30% untuk menghancurkan bahan organik serta larutan ZnCl2 untuk memisahkan partikel mikroplastik dengan non-plastik. Selanjutnya sampel diidentifikasi di laboratorium menggunakan mikroskop stereo. Komposisi mikroplastik di sedimen berpasir dan pasir berlumpur terdiri dari jenis fiber, fragmen, dan film sedangkan untuk jenis foam dan pelet tidak dijumpai dalam penelitian ini. Kepadatan mikroplastik jenis fiber mempunyai nilai rata-rata yang lebih tinggi di sedimen pasir berlumpur yaitu sebesar 6,75 partikel/25 gram sedimen kering dibandingkan dengan sedimen berpasir yang hanya sebesar 5,83 partikel/25 gram sedimen kering. Fragmen merupakan jenis mikroplastik yang nilai rata-rata kepadatannya hampir mendekati antara sedimen pasir berlumpur yang memperoleh nilai sebesar 5,58 partikel/25 gram sedimen kering dengan sedimen berpasir sebesar 5,22 partikel/25 gram sedimen kering. Mikroplastik jenis film mempunyai nilai rata-rata kepadatan yang lebih tinggi di sedimen pasir berlumpur yaitu sebesar 5,08 partikel/25 gram sedimen kering dibandingkan dengan sedimen berpasir yang hanya sebesar 3,83 partikel/25 gram sedimen kering. Hasil uji Kruskal Wallis dan uji ANOVA menunjukkan tidak terdapat perbedaan secara nyata antara kepadatan jenis mikroplastik pada sedimen berpasir dan pasir berlumpur di Pulau Los, Kota Tanjungpinang. This research is based on the presence of plastic waste in the sediments of the waters of Los Island, Tanjungpinang City. The objective of this study was to determine the composition and density of microplastics along the differences between the average values of microplastic density in each type of sediment on Los Island, Tanjungpinang City.This research was conducted in May-July 2022. Sampling used the Random Sampling method at 30 points with one sampling. Sediment samples were taken using a 0,5x0,5 m quadrant transect at a depth of 5 cm. The sediment sample was then dried in an oven, after drying the sample was given a 30% H2O2 solution to destroy organic matter and a ZnCl2 solution to separate microplastic particles from non-microplastics. The samples were then identified in the laboratory using a stereo microscope. The composition of microplastics in sandy and muddy sand sediments consisted of fiber, fragments, and films, while foam and pellet types were not found in this study. The density of fiber-type microplastics has a higher average value in muddy sand sediments, which is 6,75 particles/25 grams of dry sediment compared to sandy sediments which are only 5,83 particles/25 grams of dry sediment. Fragments are a type of microplastic with an average density value close to that of silty sand sediments with a value of 5,58 particles/25 grams of dry sediment and sandy sediments of 5,22 particles/25 grams of dry sediment. Film-type microplastics have a higher average density value in muddy sand sediments namely 5,08 particles/25 grams of dry sediment compared to sandy sediments which are only 3,83 particles/25 grams of dry sediment. The results of the Kruskal Wallis test and the ANOVA test showed that there was no significant difference between the densities of microplastic species in sandy and muddy sand sediments on Los Island, Tanjungpinang City.

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Kurnio, Hananto, e Noor C. D. Aryanto. "THE RELATIONSHIP OF SEAFLOOR SURFACIAL SEDIMENT WITH SEABOTTOM MORPHOLOGY OF LEMKUTAN ISLAND WATER, WEST KALIMANTAN". BULLETIN OF THE MARINE GEOLOGY 28, n. 2 (15 febbraio 2016): 13. http://dx.doi.org/10.32693/bomg.28.2.2013.56.

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Sea floor sediment surrounding Lemukutan Island, West Kalimantan is distributed on rather steep sea bottom morphology. The steep bottom seems a continuation of rugged morphology of the island, especially at the northeast and southeast parts. This paper discusses the relation between sediment grain sizes and the steepness of sea bottom morphology. Grain size analyses of sediment shows various sediment types such as slightly gravelly muddy sand, gravel mostly composed of coral and lithic, and gravelly sand. Results show that steepness of sea bottom slope control deposited sediment types, coarse fraction sediments tend to settle on the area of high slope angle as at the northeastern and southeastern of the island. On the other hand, high energy marine environment, such as at the sea in front of north headland of Lemukutan Island, tends to accumulate coarse sediments. High percentages of organism shells in marine sediments obviously are deposited at those two domains. Keywords: sea bottom morphology, sediment, Lemukutan Island, West Kalimantan. Sedimen dasar laut sekitar Pulau Lemukutan, Kalimantan Barat tersebar pada morfologi yang agak curam. Permukaan dasar laut yang curam tampaknya merupakan kelanjutan morfologi kasar pulau tersebut, terutama pada bagian timur laut dan tenggara. Makalah ini membahas hubungan antara besar butir sedimen dan kecuraman morfologi dasar laut. Analisis besar butir sedimen memperlihatkan jenis sedimen yang bervariasi, seperti pasir lumpuran sedikit krikilan, kerikil umumnya terdiri koral dan fragmen batuan, dan pasir krikilan. Hasil kajian menunjukkan bahwa kecuraman lereng dasar laut mengontrol tipe sedimen yang diendapkan, sedimen fraksi kasar cenderung mengendap pada daerah dengan sudut lereng tinggi seperti di bagian timur laut dan tenggara Pulau Lemukutan. Di samping itu, lingkungan laut enerji tinggi, seperti di bagian utara pulau, cenderung mengakumulasikan sedimen kasar. Prosentase tinggi dari cangkang organisma dalam sedimen laut tampak nyata diendapkan pada kedua lingkungan tersebut. Kata kunci: morfologi dasar laut, sedimen, Pulau Lemukutan, Kalimantan Barat.

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Hernawan, Undang, e Kris Budiono. "KARAKTERISTIK DAN DISTRIBUSI LUMPUR SIDOARJO SEPANJANG SUNGAI, ESTUARI DAN PERAIRAN PORONG". JURNAL GEOLOGI KELAUTAN 11, n. 2 (16 febbraio 2016): 91. http://dx.doi.org/10.32693/jgk.11.2.2013.234.

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Semburan lumpur Sidoarjo (Lusi) di daerah Porong menambah fungsi Sungai Porong menjadi sarana untuk mengalirkan lumpur ke arah laut, karena kemampuan tanggul â€“ tanggul penghalang di sekitar lokasi semburan sangat terbatas. Kondisi ini berdampak pula terhadap terbawanya lumpur lapindo ke perairan Porong. Penelitian ini bermaksud untuk mengetahui sebaran sedimen di sungai, muara dan perairan sekitar Porong terutama yang bersumber dari luapan lumpur Sidoarjo. Materi yang digunakan dalam penelitian ini adalah sebanyak 30 sampel sedimen hasil sampling yang diambil di lokasi sungai â€“ muara sungai Porong dan 30 sampel sedimen permukaan dasar laut di perairan sekitar muara sungai Porong. Distribusi umum sebaran sedimen di perairan Porong menunjukkan sedimen lumpur ditemukan di pinggir sungai dan sedimen pasir ditemukan di bagian tengah sungai. Distribusi umum sedimen dasar perairan di sekitar muara Porong berupa pasir, lempung dan lempung lanau pasiran. Hasil analisis mikroskopik dan SEM menunjukkan bahwa sedimen yang berasal dari luapan lumpur Sidoarjo ditemukan di sepanjang aliran Sungai Porong sampai muara, namun belum ditemukan di perairan luar sekitar muara Porong. Sedimen Lusi yang sampai ke muara Porong berukuran butir sampai 2,5 mikron. Deskripsi megaskopis menunjukkan sedimen Lusi pasir - kerikil umumnya berbentuk pipih (halusâ€“ agak halus). Hasil SEM menunjukkan bahwa sedimen yang berasal dari lumpur Sidoarjo umumnya seragam dan didominasi berupa smectite. Berbeda dengan sedimen sungai, hasil SEM yang diperoleh dari sampel laut yang menunjukkan sedimennya beragam, berupa montmorilonite, kaolinite dan illite. Kata Kunci : Sedimen, Porong, lumpur Sidoarjo The Sidoarjo mudflow in the Porong area increases the functions of Porong River as media to drain the muds towards the sea, because the ability of embankments in the area as a barrier is very limited. This condition intends to determine the presence and distribution of sediment in rivers, estuaries and waters originating from the Lusi mudflow. The materials used in this study are the sediment sampling results as many as 30 samples taken from the river and off the river mouth and 30 samples of sea surface sediments in the surrounding waters. General distribution of sediments in the Porong River shows the form of mud sediments are generally found in the riverside and sandy sediment found in the middle of the river, while the distribution of sediments in waters Porong form of sand, clay and sandy silt clay. The results of microscopic and SEM analysis showed that the sediments derived from the Lusi mudflow found along Porong River till estuaries, but they have not reach surrounding water of Porong estuary. The Lusi sediment that reached the estuary Porong sized to 2.5 micron. General megascopic description show the shape of the Lusi sediment as sand-gravel is a flat-shaped (rounded - sub rounded). SEM results showed that the sediments derived from the Lusi is generally uniform and dominated by smectite. In contrast to stream sediments, the SEM results obtained from marine sediment samples show a variety of sediments, in the form of montmorillonite, caolinite and illite. Key words: Sediment, Porong, Sidoarjo, Mud Overflow (Lusi)

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Hamidah, Siti, Sugeng Widada, Sri Yulina Wulandari e Lilik Maslukah. "Sebaran Sedimen Dasar Di Perairan Teluk Awur Jepara, Jawa Tengah". Buletin Oseanografi Marina 13, n. 2 (3 maggio 2024): 261–70. http://dx.doi.org/10.14710/buloma.v13i2.53955.

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Berbagai aktivitas manusia di Pesisir Teluk Awur yang berupa kegiatan pertambakan, pariwisata, pemukiman, pertanian dan operasional kampus pendidikan (Marine Science Teckno Park/MSTP) berpengaruh terhadap proses geomorfologi pantai dan masukan bahan pencemar ke perairan. Proses geomorfologi pantai dan sebaran bahan pencemar tersebut dipengaruh oleh sedimen yang tertranport dan terendapkan sebagai sedimen dasar. Oleh karena itu perlu dipetakan sebaran sedimen dasar di Perairan Teluk Awur tersebut yang ditetapkan sebagai tujuan dalam penelitian ini. Penelitian ini dilakukan pada Bulan Oktober 2022 dengan mengambil 30 titik sampling yang ditentukan secara semi purposive. Sampel sedimen dasar diambil dengan alat sediment grab dan dianalisis granulometri secara gravimetri. Nama sedimen ditentukan dengan metode Segitiga Shepard. Data pendukung yang digunakan dalam penelitian ini meliputi data arus (hasil model), data angin, pasang surut (Ipasoet), batimetri, dan peta Rupa Bumi Indonesia. Hasil penelitian menunjukkan sedimen dasar di Perairan Teluk Awur berupa pasir, lanau, lanau pasiran, dan lempung. Sedimen pasir mendominasi jenis sedimen yang ada dengan sebaran terutama pada area dekat dengan pantai. Hasil analisis diagram hjulstrom menunjukan bahwa sedimen ini terendapkan pada kecepatan arus 0,0044-0,18 m/s. Pada saat penelitian arus bergerak menuju laut dengan kecepatan 0,003-0,14 m/s. Hal ini mengindikasikan bahwa proses pengendapan sedimen dasar yang dijumpai sudah berlangsung sebelum pengambilan sampel sedimen dilakukan. Various human activities on the Gulf of Awur Coast in the form of aquaculture, tourism, settlement, agriculture, and educational campus operations (Marine Science Teckno Park / MSTP) affect the coastal geomorphological process and the input of pollutants into the water. The geomorphological process of the beach and the distribution of pollutants are influenced by transported sediments and immersion as seabed sediments. Therefore, it is necessary to map the distribution of seabed sediments in the waters of Teluk Awur which is set as the goal of this study. This study was conducted in October 2022 by taking 30 semi-purposive determined sampling points. Base sediment samples were taken with a sediment grab device and gravimetrically analyzed granulometrically. The name of the sediment is determined by the Shepard Triangle method. The supporting data used in this study include current data (model results), wind data, tides (Ipasoet), bathymetry, and maps of Indonesia. The results showed bottom sediments in the waters of Teluk Awur in the form of sand, silt, sand silt, and clay. Sand sediments dominate the type of sediment that exists with distribution, especially in areas close to the coast. The results of the Hjulstrom diagram analysis show that this sediment was deposited at a current speed of 0.0044-0.18 m/s. At the time of the study, the current moved towards the sea at a speed of 0.003-0.14 m/s. This indicates that the deposition process of the bottom sediment found was already underway before sediment sampling was carried out

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Najamuddin, Najamuddin, Irmalita Tahir, Rustam E. Paembonan e Inayah Inayah. "Pengaruh Karakteristik Sedimen terhadap Distribusi dan Akumulasi Logam Berat Pb dan Zn di Perairan Sungai, Estuaria, dan Pantai". Jurnal Kelautan Tropis 23, n. 1 (13 febbraio 2020): 1. http://dx.doi.org/10.14710/jkt.v23i1.5315.

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The purpose of the study was to analyze the effect of surface sediment characteristics including texture, organic carbon content, and redox potential of sediments on the distribution and accumulation of heavy metals Pb and Zn in three different water zones of each river, estuary and coast. Sediment texture was determined by pipette method, organic carbon content in sediments using Walkley and Black method, redox potential of sediments measured by Eh Meter, and concentrations of heavy metals Pb and Zn in sediments with Atomic Absorption Spectrophotometer with graphite furnace system. The results showed that the distribution and accumulation pattern of heavy metals Pb was similar to Zn where the highest concentration was in the coastal waters zone and the lowest was in the estuary waters zone. Sediment texture in the three zones of the dominant was sand. The percentage of organic carbon content in sediments ranges from 1.63-3.25% and the sediment redox potential was classified as reduction and transition zones. The parameters of texture, organic carbon content, and sediment redox potential have a significant influence on the distribution and accumulation of heavy metals Pb and Zn in sediments in all three water zones. Tujuan penelitian adalah menganalisis pengaruh karakteristik sedimen permukaan meliputi tekstur, kandungan karbon organik, dan potensial redoks sedimen terhadap distribusi dan akumulasi logam berat Pb dan Zn di tiga zona perairan berbeda masing-masing sungai, estuaria, dan pantai. Tekstur sedimen ditentukan dengan metode pipet, kandungan karbon organik dalam sedimen dengan metode Walkley and Black, potensial redoks sedimen diukur dengan Eh Meter, dan konsentrasi logam berat Pb dan Zn dalam sedimen dengan Spektrofotometer Serapan Atom dengan sistem graphite furnace. Hasil penelitian menunjukkan pola distribusi dan akumulasi logam berat Pb serupa dengan Zn dimana konsentrasi tertinggi di zona perairan pantai dan terendah zona perairan estuaria. Tekstur sedimen pada tiga zona perairan dominan berupa fraksi pasir (sand). Persentase kandungan karbon organik dalam sedimen berkisar antara 1,63-3,25 % dan nilai potensial redoks sedimen termasuk kategori zona reduksi dan transisi. Parameter tekstur, kandungan karbon organik, dan potensial redoks sedimen memberikan pengaruh nyata terhadap distribusi dan akumulasi logam berat Pb dan Zn dalam sedimen pada ketiga zona perairan.

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Setiady, Deny, e Ediar Usman. "KANDUNGAN MINERAL PADA SEDIMEN PANTAI DAN LAUT, HUBUNGANNYA DENGAN BATUAN SUMBER DI PESISIR KABUPATEN REMBANG, JAWA TENGAH". JURNAL GEOLOGI KELAUTAN 9, n. 3 (16 febbraio 2016): 135. http://dx.doi.org/10.32693/jgk.9.3.2011.206.

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Abstract (sommario):

Sedimen di sepanjang pantai Kabupaten Rembang terdiri atas sedimen muda (aluvial) dan sedimen tua (breksi dan batugamping). Sedimen muda merupakan sedimen lepas dan terdapat di daerah sedimentasi. Sedimen tua berupa sedimen kompak yang secara fisik mempunyai resisitensi tinggi terhadap abrasi Batuan yang terdapat di kawasan pesisir adalah: pasir kuarsa, andesit, tras kaolin, batugamping, batubara dan lempung. Peta sebaran sedimen dasar laut perairan Kabupaten Rembang, menunjukkan dominasi endapan pasir, lanau (pasir halus) dan lanau pasiran (pasir halus - kasar). Kandungan mineral yang terdapat di perairan Kabupaten Rembang terdiri dari: magnetit, pirit, hematit, zirkon, ilmenit diopsid, augit, hornblende, kuarsa, biotit, muskovit dan dolomit Kata Kunci: sedimen, mineral, Rembang The coastal sediment along the coastal of Rembang District consists of young sediment (alluvium) and old sediment (breccias and limestones). Young sediment is placer sediment that occupies the sedimentation area. Old sediment is massive sediment that has a high resistance to abrasion Rocks content in the coastal zone area consist of quarzt sand, andesite, caoline, limestone, trass, coal and clay. Seafloor surficial sediments map of the Rembang water area shows the domination of sand deposits, silt (fine sand) and sandy silt (fine to medium sand). Mineral content in Rembang waters area consists of magnetites, pyrites, hematites, zircons, ilmenite diopsides, augitse, hornblendas, quartzs, biotitse, muskovites and dolomites. Keywords: sediment, mineral, Rembang

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Suryono, Chrisna Adhi, Ibnu Pratikto e Ajeng Rusmaharani. "Logam Berat Anthropogenik Pb dan Cu pada Lapisan Sedimen Permukaan dan Dasar Muara Sungai di Kota Semarang, Jawa Tengah Indonesia". Jurnal Kelautan Tropis 22, n. 1 (13 aprile 2019): 87. http://dx.doi.org/10.14710/jkt.v22i1.3223.

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Abstract (sommario):

Semarang coastal areas as specially on river down stream have been develop to industrial, dumpping areas and human settlement. Its will be caused increasing sedimentation and anthropogenic heavy metals accumulation in sediments. In order to assess Pb, and Cu on diferent layers of sediments on three down stream rivers on Semarang, samples of surface and bed sediment were collected for analyzed by ICPMS. The result showed that the heavy metal of Pb on bed layer was higher than Pb on surface sediment, on the other hand Cu on surface sediment was higher than Cu on bed sediments. Unfraternally the heavy metal concentration on surface and beds sediments they do not correlation with totals organic carbon and combination silt and clay in sediment on three down stream rivers on Semarang. Wilayah pesisir Semarang terutama di daerah muara sungai telah berkembang menjadi kawasan industri, penimbunan dan hunian. Hal tersebut menyebabkan peningkatan sedimentasi dan akumulasi antropogenik logam berat dalam sedimen. Untuk mengetahui logam berat Pb dan Cu dalam permukaan dan dasar sedimen di tiga muara sungai Semarang. Maka sampel pada permukaan dan dasar sedimen diambil dan dianalisa dengan ICPMS. Hasil pengukuran menunjukan bahwa konsentrasi logam Pb pada lapisan dasar lebih tinggi dari pada lapisan permukaan sedimen, sebaliknya konsentrasi logam Cu pada lapisan permukaan lebih tinggi dari pada lapisan dasar sedimen. Namun keseluruhan antropogenik logam berat Pb dan Cu pada lapisan permukaan maupun bawah sedimen tidak ada korelasinya dengan kandungan total bahan organik karbon dan kombinasi antara silt dan clay dalam sedimen di ketiga mura sungai di Semarang.

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11

Trenggono, Mukti, Roy Andreas, Amron Amron, Rizqi Rizaldi Hidayat, Hendrayana Hendrayana, Rr Diah Febri Astuti e Cristiana Manullang. "An Assessment of Cilacap Coast's Total Carbonate Sediment Content". Jurnal Kelautan Tropis 24, n. 1 (12 dicembre 2020): 15–24. http://dx.doi.org/10.14710/jkt.v24i1.8849.

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Sediments are particles derived from the dismantling of rocks from the land and pieces of shell and remains of marine organisms that contain organic matter, included carbonate sediment. The total carbonate sediment content was influenced by many factors, such as sediment grain type. This study aimed to determine the carbonate content in sediments and to determine their relationship to the sediment grain characteristic on the Cilacap coast. The sediment's carbonate content used the titration method, while the sediment grain test used a dry filter. Statistical analysis was used to determine the sediment grain characteristic (mean, sorting, skewness, and kurtosis). The results showed that sediments' total carbonate content had a range of 1.93% - 6.23%, with an average of 4.21%. Sediments are dominated by fine sand with very well sorted, very platykurtic, and very fine skewed characteristics. The relationship between sediment grain characteristics and total sediment carbonate content showed a good correlation due to the sorting factor. Other parameters such as mean size and skewness have been shown a low correlation, whereas kurtosis has a shallow relationship with carbonate content.

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12

Pawitra, Misbahul Diptya, Elis Indrayanti, Muh Yusuf e Muhammad Zainuri. "Sebaran Sedimen Dasar Perairan dan Pola Arus Laut Di Muara Sungai Loji, Pekalongan". Indonesian Journal of Oceanography 4, n. 3 (27 agosto 2022): 22–32. http://dx.doi.org/10.14710/ijoce.v4i3.13443.

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Muara Sungai Loji merupakan salah satu muara sungai yang mempengaruhi sedimentasi Pantai Pekalongan, dimana muara ini digunakan sebagai jalur lalu lintas kapal. Hal tersebut dapat menimbulkan pendangkalan yang bisa mengurangi kedalaman laut. Penelitian ini bertujuan untuk mengetahui hubungan antara sedimen dasar dengan pola arus laut di Muara Sungai Loji, Pekalongan. Sampel sedimen dasar diambil menggunakan sedimen grab dan pengambilan data arus menggunakan ADCP (Acoustic Doppler Current Profiler). Pemodelan arus menggunakan pendekatan hidrodinamika 2D, dengan software MIKE21. Sementara itu sampel sedimen diolah menggunakan metode pengayakan dan pemipetan. Hasil dari penelitian ini menunjukan bahwa ukuran butir sedimen dasar yang ditemukan berupa pasir, lanau pasiran, dan lanau. Pola arus hasil pemodelan arus didapatkan kecepatan arus pada kondisi pasang yaitu 0,096 m/s, surut menuju pasang sebesar 0,18 m/s, surut terendah sebesar 0,13 m/s, dan pasang menuju surut sebesar 0,15 m/s. Arus laut mempengaruhi distribusi sedimen dasar dimana kecepatan arus yang lebih kecil akan mengendapkan sedimen dengan ukuran halus seperti di daerah sebelah timur muara, sedangkan di sebelah barat muara terdapat arus lebih tinggi sehingga mengendapkan sedimen lebih kasar karena ukuran sedimen yang halus mengalami tersuspensi. Kata kunci: Pola Arus, Sedimen Dasar, Ukuran Butir Sedimen, Muara Sungai Loji Abstract The estuary of the Loji River is one of the river estuaries that affects the sedimentation of Pekalongan Beach, where this estuary is used as a ship traffic lane. This can cause siltation which can reduce the depth of the sea. This study aims to determine the relationship between bottom sediment and ocean currents at the Loji River Estuary, Pekalongan. The bottom sediment samples were taken using a sediment grab and the current data collection using the ADCP (Acoustic Doppler Current Profiler). The current modeling uses a 2D hydrodynamic approach, using MIKE21 software. Meanwhile, sediment samples were processed using sieving and pipetting methods. The results of this study indicate that the grain size of the basic sediment found in the form of sand, sandy silt, and silt. The current pattern of the current modeling results obtained that the current velocity at high tide is 0.096 m/s, low tide is 0.18 m/s, lowest ebb is 0.13 m/s, and high tide is 0.15 m/s. Ocean currents affect the distribution of bottom sediments where a smaller current velocity will deposit fine-sized sediments such as in the east of the estuary, while in the west of the estuary there are higher currents so that coarser sediments are deposited because the finer sediments are suspended. Keywords: Current Pattern, Base Sediment, Sediment Grain Size, Loji River Estuary

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13

Rachman, Reno Arief, Haryo Dwito Armono, Mardi Wibowo e Dinar Catur Istiyanto. "Studi Karakteristik Sedimen Dasar Perairan Tanjung Pasir Banten menggunakan Metode Gradistat". Buletin Oseanografi Marina 12, n. 2 (17 aprile 2023): 201–12. http://dx.doi.org/10.14710/buloma.v12i2.48287.

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Program NCICD (National Capital Integrated Coastal Development) merupakan program strategis nasional untuk menangani permasalahan di Teluk Jakarta. Salah satu rencananya adalah dengan membangun waduk lepas pantai (WLP) di Perairan Tanjung Pasir, Banten. WLP selain berfungsi sebagai tanggul laut juga sebagai penyedia air baku. Dalam perencanaan WLP salah satu pertimbangan utama adalah permasalahan sedimentasi. Proses sedimentasi di perairan sangat terkait dengan karakteristik sedimen. Tujuannya penelitian ini adalah untuk mengetahui pola sebaran karakteristik sedimen dasar seperti kadar air, berat jenis, gradasi, tekstur sedimen, ukuran d50 butir sedimen dan analisis statistik sedimen dasar sehingga dapat mendukung rencana pembangunan WLP NCICD. Metode yang dipakai adalah pengambilan sampel sedimen di lapangan, pengujian sampel sedimen di laboratorium, analisis sedimen secara statistik dan analisis deskriptif karakteristik sedimen dasar menggunakan metode Gradistat. Berdasarkan hasil kajian diketahui nilai kadar air 39,657 % - 413,83 %, berat jenis 1,633 g/cm3 – 2,557 g/cm3, ukuran butir 0,085 mm – 2,0 mm, ukuran rerata butir 261,1 µm - 2657,5 µm, sortasi sedimen very poorly sorted (terpilah sangat buruk) dan poorly sorted (terpilah buruk), analisis statistik sedimen tipe very platykurtic, jenis lithologi didominasi oleh pasir, sedikit berukuran lanau dan pasir halus hingga pasir sedang. Sedimen dasar di perairan ini mempunyai daya dukung tanah yang baik untuk dibangun WLP. The NCICD (National Capital Integrated Coastal Development) is a national strategic program to deal with problems in Jakarta Bay. One of the plans is to build a sea dike (WLP) in Tanjung Pasir, Banten. In addition to functioning as a sea wall, WLP is also a raw water provider. In WLP planning, one of the primary considerations is the problem of sedimentation. The sedimentation process in the waters is closely related to the characteristics of the sediment. This study aimed to determine the distribution pattern of bottom sediment characteristics such as water content, specific gravity, gradation, sediment texture, d50 sediment grain size, and statistical analysis of bottom sediments to support the NCICD WLP development plan. The method used is taking sediment samples in the field, testing sediment samples in the laboratory, statistical analysis of sediments, and descriptive analysis of bottom sediment characteristics using the Gradistat method. Based on the results of the study, it is known that the water content is 39.657% - 413.83%, the specific gravity is 1.633 g/cm3 – 2.557 g/cm3, the grain size is 0.085 mm – 2.0 mm, the average grain size is 261.1 µm - 2657.5 µm, Sediment sorting is very poorly sorted and poorly sorted, statistical analysis is classified as very platykurtic type, lithology type dominated by sand, slightly silt, and fine sand to medium sand. The bottom sediments in these waters have good soil-carrying capacity for WLP construction.

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14

Subardjo, Petrus, Agus Anugroho Dwi Suryoputro e Ibnu Praktikto. "Sebaran Sedimen Tersuspensi di Perairan Teluk Awur Jepara menggunakan Citra Landsat 8". Buletin Oseanografi Marina 9, n. 1 (24 aprile 2020): 77–82. http://dx.doi.org/10.14710/buloma.v9i1.29111.

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Abstract (sommario):

Sedimen tersuspensi dianggap sebagai sedimen yang didistribusikan oleh arus laut. Arus sepanjang pantai (longshore current) berperan besar terhadap proses perpindahan sedimen di perairan. Gelombang laut yang yang membentuk sudut terhadap garis pantai menyebabkan arus sepanjang pantai Transpor sedimen yang disebabkan oleh arus sepanjang panti sering menimbulkan permasalahan erosi pantai dan pendangkalan perairan. Perairan Teluk Awur memiliki bentuk teluk dan tanjung yang memungkinkan terjadinya arus sepanjang pantai. Potensi adanya proses erosi dan sedimentasi di perairan Teluk Awur membuat pentingnya kajian mengenai pola sebaran sedimen tersuspensi. Penelitian ini mampu menjelaskan tentang pola sebaran sedimen tersuspensi di perairan Teluk Awur, Kecamatan Tahunan, Kabupaten Jepara. Metode yang digunakan untuk penentuan sedimen tersuspensi menggunakan pengindraan jauh dan data yang digunakan yaitu citra satelit landsat-8. Kandungan sedimen tersuspensi tertinggi berada di Desa Teluk Awur dan Desa Demaan. Kandungan tertinggi sebesar ± 67,54 mg/L dan semakin menjauhi pantai konsentrasi menurun. Tingginya kadungan sedimen tersuspensi dipengaruhi oleh proses mixing dan intensitas curah hujan. Suspended sediments are considered as sediments distributed by ocean currents. Current along the coast (longshore current) plays a major role in the process of transfer of sediment in the waters. Sea waves that form angles to the coastline cause currents along the coast Sediment transport caused by currents along the orphanage often cause erosion and coastal silting problems. The waters of Teluk Awur have the shape of bays and headlands which allow currents along the coast. The potential for erosion and sedimentation in the Awur Bay waters makes it important to study the pattern of suspended sediment distribution. This research is able to explain the pattern of suspended sediment distribution in Awur Bay waters, Annual District, Jepara Regency. The method used to determine suspended sediment uses remote sensing and the data used are Landsat-8 satellite imagery. The highest suspended sediment content was in Teluk Awur Village and Demaan Village. The highest content of ± 67.54 mg / L and increasingly away from the beach decreased concentration. The high suspended sediment content is influenced by the mixing process and the intensity of rainfall.

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15

Irham, Muhammad, Saidatul Adhla e Chitra Octavina. "Analisis kimia sedimen di sekitar ekosistem mangrove desa Lambadeuk, Peukan Bada, Aceh Besar". Depik 9, n. 1 (2 gennaio 2020): 1–7. http://dx.doi.org/10.13170/depik.9.1.15163.

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Abstract. Research on analysis of sediments chemistry around the mangrove ecosystem of Lambadeuk village, Peukan Bada Subdistrict aimed to the analyze nutrient content of sediments around mangrove ecosystem which grows in Lambadeuk, Aceh Besar. The study was conducted in April 2018 - May 2019. Research stations were determined by using purposive random sampling method then sediment samples were taken by coring technic. The results of the analysis showed that there are two types of sediments; muddy sand and sandy mud type of sediment. Sandy mud sediment has higher organic matter than muddy sand. The percentage value of total organic matters ranged from 27.89% - 42.41%, while C-Organic was between 0.08% - 1.28%. The percentage of dominant C-organic was found in places that are overgrown with mangroves, while the total organic matter content is more in places that does not have mangroves. In addition to the presence of mangroves that affect the amount of organic sediment and type of sediment, oceanographic factors such as currents, topography, organic matter content, and C-Organic are also affect the type of existing sediment.Keywords: Mangroves, Sediment, Organic matter, C-Organic.Abstrak. Penelitian mengenai analisis kimia sedimen di sekitar ekosistem mangrove Desa Lambadeuk, Kecamatan Peukan Bada bertujuan untuk menganalisis kandungan unsur hara sedimen di sekitar ekosistem mangrove yang tumbuh di daerah Lambadeuk, Aceh Besar. Penelitian ini dilakukan pada bulan April – Mei 2019. Metode penentuan stasiun penelitian menggunakan metode purposive random sampling kemudian sampel sedimen diambil dengan menggunakan coring. Hasil analisis menunjukkan bahwa tipe sedimen yang ada di Desa Lambadeuk, Kecamatan Peukan Bada terdapat dua tipe sedimen yaitu pasir berlumpur (muddy sand) dan lumpur berpasir (sandy mud). Tipe sedimen lumpur berpasir memiliki kandungan bahan organik lebih tinggi daripada pasir berlumpur. Nilai persentase kandungan bahan organik total berkisar yaitu berkisar antara 27,89 % - 42,41 %, sedangkan C-organik berkisar antara 0,08 % - 1,28 %. Persentase C-organik lebih banyak terdapat di tempat yang banyak ditumbuhi mangrove, sedangkan kandungan bahan organik total lebih banyak di tempat yang tidak ditumbuhi mangrove sama sekali. Disamping keberadaan mangrove yang mempengaruhi besarnya bahan organic sedimen, faktor-faktor oseanografi seperti arus, topografi, kandungan bahan organik, dan C-organik juga mempengauhi tipe sedimen yang ada.Kata Kunci: Mangrove, Sedimen, Bahan Organik, C-organik.

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Rampengan, Royke M. "INTERPRETASI PEUBAH UKURAN BUTIR SEDIMEN". JURNAL PESISIR DAN LAUT TROPIS 12, n. 1 (10 febbraio 2024): 37–45. http://dx.doi.org/10.35800/jplt.12.1.2024.55950.

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Sediment characteristics are described through grain size variables so that an understanding of sediment is built based on the interpretation of these variables. The distribution of sediment grain sizes reflects the viscosity and strength of factors acting on the depositional environment. That is why, knowledge of the grain size characteristics of sediments in certain depositional environments is very necessary in relation to the management of that area. This research was conducted to determine the extent to which sediment grain size variables describe sediment character. To reveal this, sediment samples were taken from two visually different depositional environments on the beach. The sediment collection location is in the beach around the Unsrat Marine Field Station in Likupang. Sediment collection was carried out at Station 1 and Station 2, where the two stations were separated by a pier. The two sediment samples were then processed according to sediment handling procedures starting from washing to obtaining the sediment weight according to the sieve diameter. Through graphic procedures, sediment weight data is used to produce a number of values used in calculating sediment granulometric variables. The parameters of sediment granulometric variables that are calculated are mean, sorting, skewness and kurtosis. Based on the studies carried out, it was concluded that the characteristics of sediment taken from different depositional environments on the beach can be clearly differentiated through the classification values of grain size variables.. Keywords: sediment grain-size, sorting, skewness, kurtosis ABSTRAK Karakteristik sedimen dideskripsikan melalui peubah ukuran butirnya sehingga pemahaman tentang sedimen dibangun berdasarkan interpretasi terhadap peubah tersebut. Sebaran ukuran butir sedimen merefleksikan ketidakstabilan dan kekuatan faktor-faktor yang bekerja pada lingkungan deposisional. Itulah sebabnya, pengetahuan terhadap karakteristik ukuran butir sedimen pada lingkungan pengendapan tertentu, sangat dibutuhkan dalam kaitannya dengan pengelolaan ruang tersebut. Penelitian ini dilakukan untuk mengetahui sejauh mana peubah ukuran butir sedimen menggambarkan karakter sedimen. Untuk mengungkap hal tersebut, sampel sedimen diambil dari dua lingkungan pengendapan yang secara visual berbeda pada lahan gisik. Lokasi pengambilan sedimen berada di kawasan gisik sekitar Marine Field Station Unsrat di Likupang. Pengambilan sedimen dilakukan pada Stasiun 1 dan Stasiun 2, di mana kedua stasiun ini dipisahkan oleh adanya struktur bangunan berupa dermaga. Kedua sampel sedimen selanjutnya diproses sesuai prosedur penanganan sedimen mulai dari pencucian sampai memperoleh berat sedimen menurut ukuran diameter ayakan. Melalui prosedur grafik, data berat sedimen digunakan untuk menghasilkan sejumlah nilai yang digunakan dalam perhitungan peubah granulometri sedimen. Parameter-parameter peubah granulometri sedimen yang dihitung adalah rataan empirik, penyortiran, kemencengan, dan peruncingannya. Berdasarkan kajian yang dilakukan, disimpulkan bahwa karakteristik sedimen yang diambil dari lingkungan pengendapan yang berbeda pada lahan gisik dapat dibedakan secara jelas melalui nilai klasifikasi peubah ukuran butir. Kata Kunci: ukuran butir sedimen, pemilahan, kemencengan, peruncingan

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Sakmiana, Andi Fitri, Mohammad Sumiran Paputungan, Widya Kusumaningrum e Susi Rahmawati. "Estimasi Konsentrasi dan Stok Karbon Organik pada Sedimen Lamun di Desa Selangan, Kalimantan Timur". Journal of Marine Research 12, n. 3 (16 giugno 2023): 483–92. http://dx.doi.org/10.14710/jmr.v12i3.38011.

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Abstract (sommario):

Informasi mengenai stok karbon di sedimen ekosistem lamun di Indonesia masih sedikit, khususnya di Kalimantan Timur. Penelitian ini bertujuan untuk mengestimasi stok karbon organik pada sedimen lamun yang berada di perairan sekitar Desa Selangan, pesisir Bontang. Pengambilan sampel sedimen dilakukan pada bulan September 2021, dengan menggunakan pipa PVC yang berdiameter 7 cm dengan panjang 130 cm. Pengambilan sampel sedimen berjumlah 3 core dimulai dari titik lamun yang berdekatan dengan ekosistem mangrove ke arah laut dengan jarak 50 m antar stasiun. Konsentrasi karbon organik sedimen diukur menggunakan metode loss on ignition (LOI) yang dilakukan di Laboratorium Botani Pusat Riset Oseanografi BRIN. Hasil penelitian menunjukkan konsentrasi karbon organik pada lokasi penelitian berkisar 1,70-4,90% dengan nilai rata-rata sebesar 2,72 ±0,20 %. Estimasi stok karbon sedimen lamun yang terdapat di perairan sekitar Desa Selangan adalah 210,94 Mg C/ha. Tidak terdapat perbedaan signifikan pada konsentrasi dan stok karbon organik antar lapisan sedimen. Namun, kedua nilai tersebut cenderung rendah pada lokasi lamun yang berada jauh dari ekosistem mangrove. The available information on sediment organic carbon stock data of the seagrass ecosystem in Indonesia is limited, especially in East Kalimantan. This study aimed to estimate the concentration and stock of organic carbon in seagrass sediment in Selangan, a coastal area of Bontang. Field activities to collect sediment samples were done in September 2021 by using 7-diameter PVC tube core with 130 cm length. Three sediment cores were collected from seagrass adjacent to mangrove ecosystem with 50 m interval between the cores toward the sea. Organic carbon concentration in sediment measured by using loss on ignition method that was performed in Botanical Laboratory of Research Center for Oceanography BRIN. The results showed that the concentration of organic carbon at the study sites ranged from 1.70-4.90% with average at 2.72 ±0.20%. Organic carbon stocks in seagrass sediments in Selangan were estimated at 210.94 Mg C/ha. Both sediment organic carbon concentration and storage values were no significant difference through the layer of sediments. However, both values tend to low in seagrass sediment which were far from mangrove ecosystem.

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Sakmiana, Andi Fitri, Mohammad Sumiran Paputungan, Widya Kusumaningrum e Susi Rahmawati. "Estimasi Konsentrasi dan Stok Karbon Organik pada Sedimen Lamun di Desa Selangan, Kalimantan Timur". Journal of Marine Research 12, n. 3 (16 giugno 2023): 483–92. http://dx.doi.org/10.14710/jmr.v12i3.38011.

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Abstract (sommario):

Informasi mengenai stok karbon di sedimen ekosistem lamun di Indonesia masih sedikit, khususnya di Kalimantan Timur. Penelitian ini bertujuan untuk mengestimasi stok karbon organik pada sedimen lamun yang berada di perairan sekitar Desa Selangan, pesisir Bontang. Pengambilan sampel sedimen dilakukan pada bulan September 2021, dengan menggunakan pipa PVC yang berdiameter 7 cm dengan panjang 130 cm. Pengambilan sampel sedimen berjumlah 3 core dimulai dari titik lamun yang berdekatan dengan ekosistem mangrove ke arah laut dengan jarak 50 m antar stasiun. Konsentrasi karbon organik sedimen diukur menggunakan metode loss on ignition (LOI) yang dilakukan di Laboratorium Botani Pusat Riset Oseanografi BRIN. Hasil penelitian menunjukkan konsentrasi karbon organik pada lokasi penelitian berkisar 1,70-4,90% dengan nilai rata-rata sebesar 2,72 ±0,20 %. Estimasi stok karbon sedimen lamun yang terdapat di perairan sekitar Desa Selangan adalah 210,94 Mg C/ha. Tidak terdapat perbedaan signifikan pada konsentrasi dan stok karbon organik antar lapisan sedimen. Namun, kedua nilai tersebut cenderung rendah pada lokasi lamun yang berada jauh dari ekosistem mangrove. The available information on sediment organic carbon stock data of the seagrass ecosystem in Indonesia is limited, especially in East Kalimantan. This study aimed to estimate the concentration and stock of organic carbon in seagrass sediment in Selangan, a coastal area of Bontang. Field activities to collect sediment samples were done in September 2021 by using 7-diameter PVC tube core with 130 cm length. Three sediment cores were collected from seagrass adjacent to mangrove ecosystem with 50 m interval between the cores toward the sea. Organic carbon concentration in sediment measured by using loss on ignition method that was performed in Botanical Laboratory of Research Center for Oceanography BRIN. The results showed that the concentration of organic carbon at the study sites ranged from 1.70-4.90% with average at 2.72 ±0.20%. Organic carbon stocks in seagrass sediments in Selangan were estimated at 210.94 Mg C/ha. Both sediment organic carbon concentration and storage values were no significant difference through the layer of sediments. However, both values tend to low in seagrass sediment which were far from mangrove ecosystem.

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Hidayat, Ryan Akhmal, Lilik Maslukah e Muhammad Zainuri. "Sebaran Ukuran Butir di Perairan Kemujan, Karimunjawa". Indonesian Journal of Oceanography 4, n. 2 (21 maggio 2022): 12–21. http://dx.doi.org/10.14710/ijoce.v4i2.14123.

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Abstract (sommario):

Pulau Kemujan memiliki kelimpahan sumberdaya ekosistem seperti ekosistem karang, mangrove dan lamun. Perairan bagian barat memiliki bentuk yang unik, karena ada sebagian perairannya berada pada lokasi yang tertutup oleh daratan dan tumbuh subur pohon mangrove. Keberadaan ekosistem mangrove dan bentuk perairan yang semi tertutup akan berpengaruh terhadap distribusi ukuran butirnya. Kajian sebaran sedimen pada Pulau Kemujan ditujukan untuk mendapatkan gambaran mengenai kondisi sedimen dan keterkaitannya dengan proses hidrooseanografi yang terjadi. Daerah penelitian mencakup perairan tertutup dan perairan terbuka sebanyak 30 stasiun. Sampel sedimen diambil menggunakan Vanveen grab. Analisis ukuran butir sedimen menggunakan metode dry sieing (pengayakan) dan wet sieving (pemipetan). Hasil penelitian menunjukkan bahwa pola sebaran sedimen lebih didominansi oleh pasir dan jenis sedimen halus ditemukan di perairan yang lebih dalam ≥7 meter serta lokasi stasiun jauh dari sumbernya (daratan). Pola distribusi sedimen kasar berkaitan dengan kondisi arus yang lebih lemah dan ditemukan pada perairan lebih dangkal. Kata kunci: Ukuran Butir, Sedimen, Arus, Karimunjawa Abstract Kemujan Island has ecosystem resources such as coral, mangrove and seagrass ecosystems. The western waters have a unique shape, because some of the waters are in a location that is covered by land and mangrove trees thrive. the existence of mangrove ecosystems and the shape of the waters that are semi-enclosed will affect the grain size distribution. The study of the distribution of sediments on Kemujan Island is aimed at obtaining an overview of the sediment conditions and their relationship to the hydrooceanographic process. The research area of closed waters and open waters is 30 stations. Sediment samples were taken using a vanveen grab. Sediment grain size analysis used dry sieving and wet sieving (pipepeting) methods. The results obtained show that the distribution of sediment patterns is more dominated by sand and the type of fine sediment is found in deeper waters ≥ 7 meters and the location of the station is far from the source (land). The distribution pattern of coarse sediment is associated with weaker currents and shallower waters. Keywords: Grain Size, Sediments, Current, Karimunjawa

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Setiady, Deny, Udaya Kamiludin e Nienu Yayu Gerhaneu. "JENIS DAN SEBARAN SEDIMEN DI PERAIRAN PAPELA DAN SEKITARNYA, ROTE-NDAO, NUSA TENGGARA TIMUR". JURNAL GEOLOGI KELAUTAN 13, n. 3 (16 febbraio 2016): 153. http://dx.doi.org/10.32693/jgk.13.3.2015.270.

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Daerah Penelitian terletak di perairan Papela dan sekitarnya yang merupakan bagian dari Selat Rote yang secara administratif merupakan wilayah dari Kabupaten Rote-Ndao, Provinsi Nusa Tenggara Timur. Di daerah penelitian pada 40 lokasi telah dilakukan pengambilan sedimen dasar laut dengan pemercontoh comot, deskripsi megaskopis dan analisis besar butir. Penelitian bertujuan untuk mengetahui jenis sedimen, sebaran sedimen dan lingkungan pengendapannya. Berdasarkan hasil analisis besar butir nomenklatur sedimen di daerah penelitian dijumpai 4 jenis sedimen yaitu: kerikil, pasir, pasir lanauan, lanau pasiran dan lanau. Sebaran kerikil terdapat di dua tempat, yaitu di utara dan selatan tepian daerah penelitian.Sebaran pasir mencapai kurang lebih 30 % dari luas perairan penelitian, pasir lanauan menutupi kurang 5 % dari luas perairan penelitian, lanau pasiran mempunyai sebaran kurang lebih 30 % dari luas perairan daerah penelitian dan sebaran lanau terdapat di muka muara sungai bagian dalam Teluk Papela dengan tutupan kurang lebih 5 % dari luas perairan penelitian.Kata kunci Sedimen permukaan dasar laut, analisis besar butir, sebaran sedimen, perairan Papela The study area is located in Papela waters area and that is part of the Rote Strait, administratively is a region of Rote-Ndao regency, East Nusa Tenggara Province. The method of research conducted is sampling seafloor sediments, megaskopis description and analysis of the grain size. The study area is located in Papela waters area and that is part of the Rote Strait, administratively is a region of Rote-Ndao regency, East Nusa Tenggara Province. The method of research conducted is sampling seafloor sediments, megaskopis description and analysis of the grain size. The purpose of research is the grain size analysis of seabed surface sediment to determine the type of sediment, sediment distribution and depositional environment. Based on nomenklature sediment grain size analysis result in the study area was found four types of sediments , there are: gravelly, sand, silty sand, sandy silt and silt Distribution of gravel found in two places, namely on the north and south banks of the study area. Distribution of sand reaches approximately 30% of the water area of research, silty sand covering approximately 5% of the water area of research, sandy silt has spread approximately 30% of the total water area of research and distribution of silt contained in the inner face of the Gulf estuaries Papela with cover approximately 5% of the water area of research. Keywords: Surficial sediment, grain size analysis, sediment distribution, Papela Waters

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21

Lugra, I. Wayan. "HEAVY MINERAL DISTRIBUTION PATTERNS AND CHARACTERISTICS OF SEA FLOOR SURFICIAL SEDIMENT AT EAST BALI WATERS, BALI PROVINCE". BULLETIN OF THE MARINE GEOLOGY 26, n. 2 (15 febbraio 2016): 105. http://dx.doi.org/10.32693/bomg.26.2.2011.38.

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Analyses result of the heavy minerals that was took from beach sediments and sea floor surficial sediments was founded ten heavy minerals namely hematite, magnetite, limonite and rutile from oxide and hydroxide group, pyroxene, amphibol and zircon from silicate group, biotit from mica group, barite from sulfide group and dolomite from carbonate group. From 10 minerals identified, only magnetit distributes in the whole area, with the highest percentage of 34,15% in the sea and 35,14 % on beaches. Other heavy minerals distribute locally with the percentage of less than 0,01 %. Grain size analyses result of sea floor surficial sediment had identified six units sediment such as sand, sand with few gravel, sandy gravel, gravely sand, gravel and reef. Distribution area of the six units sediment as follows sand and sandy gravel are occupied 25 % respectively of the study area, reef 20%, sand 15 %, gravel 10 % and gravely sand occupied 5%. The best sediment for making art goods is sand sizes which is rich of heavy minerals such as magnetite, hematitre, limonite, zircon, pyroxene and amphibol. If will be exploited of the sand sediment on beach or sea floor surficial sediment, should be considering of the environment sustainable. Keyword: grain size analyses, heavy mineral, seafloor surficial sediment, besach sediment, Karang Asem Hasil analisis mineral berat dari sedimen pantai dan permukaan dasar laut dijumpai sepuluh jenis mineral berat yaitu magnetit, hematit, limonit, rutil dari kelompok oksida & hidroksida, piroksen, ampibol, sirkon dari kelompok silikat, biotit dari kelompok mika, barit dari kelompok sulfida dan dolomit dari kelompok karbonat. Dari sepuluh jenis mineral berat yang teridentifikasi hanya magnetit yang sebarannya merata di seluruh daerah penyelidikan baik di laut maupun di pantai dengan persentase tertinggi 34,15 % di laut dan 35,14% di pantai, sedangkan sembilan mineral lainnya sebarannya tidak merata atau setempat-setempat dengan persentase umumnya di bawah 0,01 %. Hasil analisis besar butir sedimen permukaan dasar laut dapat di bedakan menjadi 6 satuan yaitu pasir, pasir sedikit krikilan, pasir krikilan, krikil pasiran, krikil dan terumbu karang. Luas sebaran ke enam jenis sedimen tersebut terhadap luas daerah penelitian adalah pasir sedikit krikilan menempati 25%, pasir krikilan 25%, terumbu karang 20%, pasir 15%, krikil 10% dan menempati pasir krikilan 5%. Jenis sedimen yang baik untuk pembuatan benda seni adalah sedimen berukuran pasir dengan kandungan mineral berat yang tinggi seperti magnetit, hematit, limonit, sirkon, piroksen, dan ampibol. Bila akan dilakukan eksploitasi terhadap sedimen jenis pasir baik di laut maupun di pantai, harus memperhatikan kelestarian lingkungan. Kata kunci: analisis besar butir, mineral berat, sedimen permukaan dasar laut, sedimen pantai, Karang Asem

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22

Hapsari, Faradian Nurul, Lilik Maslukah, I. Wayan Eka Dharmawan e Sri Yulina Wulandari. "Simpanan Karbon Organik Dalam Sedimen Mangrove Terhadap Pasang Surut Di Pulau Bintan". Buletin Oseanografi Marina 11, n. 1 (25 settembre 2021): 86–98. http://dx.doi.org/10.14710/buloma.v11i1.39107.

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Ekosistem mangrove memberikan kontribusi terbesar pada kawasan pesisir dalam penyerapan karbon dari atmosfer serta penyimpanan karbon dalam bentuk biomassa ataupun terpendam di dalam sedimen. Variasi simpanan karbon pada sedimen mangrove sangat tergantung dengan struktur komunitas dan karakter oseanografi yaitu pasang surut. Tujuan penelitian ini adalah untuk menganalisis variasi nilai simpanan karbon sedimen mangrove di Pulau Bintan serta menganalisis hubungannya dengan karakter pasang surut. Lokasi penelitian memiliki karakter struktur komunitas mangrove yang berbeda, yaitu Desa Lagoi yang didominasi oleh jenis Ceriops tagal, dan Desa Kawal yang didominasi oleh jenis Rhizophora apiculata. Setiap lokasi penelitian dibagi menjadi tiga zona tegak lurus garis pantai berdasarkan parameter dominansi jenis. Parameter yang diukur yaitu ukuran butir sedimen, struktur komunitas mangrove, karbon sedimen dan pasang surut. Data karbon organik dan ukuran butir sedimen menggunakan metode wet sieving dan LOI, sedangkan untuk pasang surut diperoleh dari Badan Informasi Geospasial (BIG). Hasil penelitian menujukan bahwa simpanan karbon organik sedimen yang lebih besar ditemukan di wilayah yang memiliki ukuran butir yang lebih halus dengan arus dan tenggang waktu menuju surut yang lebih rendah serta rerata ukuran dan tinggi mangrove yang lebih besar. Tenggang waktu menuju surut lebih cepat akan mengakibatkan perputaran sedimen dan serasah cepat sehingga pengendapan sedimen dan serasah berkurang. Simpanan karbon organik sedimen mangrove memiliki perbedaan yang cukup signifikan di Kawal dan Lagoi dengan rerata sebesar 13,90 ton C ha-1 dan 7,64 ton C ha-1. Mangrove ecosystems provide the largest contribution to coastal areas in absorbing carbon from the atmosphere and storing carbon in the form of biomass or buried in sediments. The variation of carbon storage in mangrove sediments is highly dependent on the community structure and the oceanographic character of the tides. The purpose of this study was to analyze variations in the value of carbon storage of mangrove sediments in Bintan Island and to analyze their relationship with tides. The research location has a different character of mangrove community structure, namely Lagoi Village which is dominated by the Ceriops tagal species, and Kawal Village which is dominated by the Rhizophora apiculata species. Each research location is divided into three zones perpendicular to the coastline based on the parameter of species dominance. Parameters measured were sediment grain size, mangrove community structure, sediment carbon and tides. Organic carbon and sediment grain size data using wet sieving and LOI methods, while tides were obtained from the Geospatial Information Agency (BIG). The results showed that larger organic sediment carbon stores were found in areas that had finer grain sizes with lower currents and time periods to tide and larger mean size and height of mangroves. The time to recede faster will result in rapid circulation of sediment and litter so that sediment and litter deposition is reduced. The organic carbon storage of mangrove sediments has a significant difference in Kawal and Lagoi with an average of 13.90 tonnes C ha-1 and 7.64 tonnes C ha-1.

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23

Maulina, Dinda Rizky Ayu, Delianis Pringgenies e Dwi Haryanti. "Kandungan Logam Berat Pb dan Cd dalam Sedimen di Pantai Trimulyo dan Pantai Tirang, Semarang". Journal of Marine Research 13, n. 1 (28 dicembre 2023): 20–28. http://dx.doi.org/10.14710/jmr.v13i1.35038.

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Kandungan timbal (Pb) dan kadmium (Cd) di sedimen sebagian berasal dari limbah industri yang masuk ke perairan dan terakumulasi di muara sungai. Pantai Trimulyo berada di pesisir Semarang, dekat dengan Kawasan Industri Terboyo yang berpotensi membuang limbah logam berat ke peraian. Pantai Tirang juga berpotensi tercemar limbah logam berat dari industri di Kecamatan Tugu yang masuk ke aliran Sungai Tapak. Penelitian ini bertujuan untuk mengetahui kandungan logam Pb dan Cd pada sedimen di Pantai Trimulyo dan Pantai Tirang. Penelitian dilakukan dengan metode survei eksploratif dan penentuan lokasi pengamatan dengan metode purposive sampling. Sampel sedimen diambil sebanyak 3 kali pengulangan disetiap lokasi dengan sediment core. Sampel sedimen dianalisis di Laboratorium BBTPPI Semarang menggunakan alat Atomic Absorption Spectrophotometer (AAS) untuk menentukan kadar logam Pb dan Cd dalam sedimen. Hasil analisis kandungan logam Pb dalam sedimen menunjukkan bahwa konsentrasi logam berat tertinggi ditemukan di Pantai Tirang sebesar 49,16 mg/kg dan Pantai Trimulyo memiliki kandungan Pb tertinggi 23,78 mg/kg. Hasil analisis kandungan logam Cd dalam sedimen di Pantai Trimulyo dan Pantai Tirang sebesar >0,050 mg/kg. Pengukuran parameter lingkungan (suhu, salinitas, pH, DO, kecepatan arus dan kecerahan perairan) secara in situ menunjukkan konstribusi terhadap kandungan logam berat pada sedimen. Secara keseluruhan, kandungan logam berat Cd pada sedimen di setiap lokasi penelitian tidak melebihi baku mutu, sedangkan kandungan logam berat pada sedimen yang melebihi atau mendekati baku mutu yaitu logam berat timbal. The sediments contain lead (Pb) and cadmium (Cd) from industrial waste were often found to enter nearby waters and accumulates at river mouths. Trimulyo Beach is adjacent to the Terboyo Industrial Estate on Semarang's coast, which has the potential to dump heavy metal waste into the waters. Heavy metal waste from industry in Tugu District that enters the Tapak River might also pollute Tirang Beach. The aim of the study is to determine the Pb and Cd content of sediments at Trimulyo and Tirang beaches. The research was conducted by using an exploratory survey method, and the research site was determined using a purposive sampling method. Using the sediment core, sediment samples were taken three times in each location. The levels of Pb and Cd metals in sediment samples were analysed using an Atomic Absorption Spectrophotometer (AAS) at the Semarang BBTPPI Laboratory. The analysis of the metal content of Pb in the sediment showed that Tirang Beach had the highest concentration of heavy metal at 49.16 mg/kg, and Trimulyo Beach had the highest Pb content at 23.78 mg/kg. The results showed that the Cd metal content in sediments at Trimulyo Beach and Tirang Beach was >0.050 mg/kg. Environmental parameters measured in situ (temperature, salinity, pH, DO, current velocity, and water clarity) made a contribution to the heavy metal content in the sediment. Overall, the heavy metal content of Cd in the sediment at each research location did not exceed the quality standard, while the lead heavy metal exceeded or approached the quality standard.

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Nurhamiddin, Fauziah, e Zulkifli Zam-Zam. "DISTRIBUSI KONSENTRASI LOGAM BERAT (CU DAN CD) PADA SEDIMEN SUNGAI MENGGUNAKAN TEKNIK DIFFUSIVE GRADIENT IN THIN FILM = Distribution of Cu and Cd Concentration in the River using Diffusive Gradient in Thin Film Tehnique". Jurnal Teknologi Lingkungan 14, n. 2 (1 dicembre 2016): 107. http://dx.doi.org/10.29122/jtl.v14i2.1429.

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DISTRIBUSI KONSENTRASI LOGAM BERAT (CUDAN CD) PADA SEDIMEN SUNGAI MENGGUNAKANTEKNIK DIFFUSIVE GRADIENT IN THIN FILM =Distribution of Cu and Cd Concentration in the River usingDiffusive Gradient in Thin Film TehniqueFauziah Nurhamiddin* dan Zulkifli Zam Zam*** Fakultas MIPA Universitas Muhammadiyah Maluku Utara** Program Studi Pendidikan Kimia Universitas Khairun TernateE-mail: zul_kifli79@ymail.comDiterima: 01 April 2013; Dikoreksi: 04 Mei 2013; Disetujui : 12 Mei 2013AbstractSediment in the bottom of the river has the potential as a store of inorganic compounds such as Cuand Cd, which are from human activities. The purpose of this research was to determine the typeand nature of the sediment contained in the river, to know the characteristics of the sediments andthe distribution of Cu and Cd concentrations in variations of the river sediment depth, as well as todetermine the concentration profiles of Cu and Cd in each sediment depth. The results showed thatthe type of sediment in the Brantas River can be classified into argillaceous sand. The concentrationof Cu and Cd in the second location is higher than in the first location. Cu metal concentrations insediments ranged from 0.0028 to 0.0922 ppm, and Cd metal concentration in the sediments rangedfrom 0.0022 to 0.2147 ppm .Brantas River sediments on both locations can be classified into fullysustained type which the sediments are able of to supply solutes into the pore water so that fluxsolute to pore water is equal to the flux solutes from pore water to prob DGT. This happens becausethe speed of diffusion of solutes from the solid particles sediment to pore water is equal to the speedof diffusion of solute from the pore water to prob DGT. Sediments at both locations can be includedin the category of fully unsustained. From these results, it can be concluded that the Brantas Riversediments have a role that is not functioning as a store of Cu and Cd metal because it is easy torelease metals into the river.Keywords: sediments, heavy metals, Cu, Cd, DGTAbstrakSedimen di bawah sungai berpotensi sebagai penyimpan senyawa anorganik seperti Cu dan Cd,yang berasal dari aktifitas manusia di sekitarnya. Tujuan penelitian ini adalah untuk mengetahuijenis dan sifat sedimen yang terdapat pada Sungai, mengetahui karakteristik sedimen dandistribusi konsentrasi Cu dan Cd dalam variasi kedalaman sedimen sungai, serta menentukan profilkonsentrasi Cu dan Cd pada tiap kedalaman sedimen. Hasil penelitian menunjukkan bahwa jenissedimen pada sungai Brantas dapat digolongkan kedalam pasir berlempung. Konsentrasi logamCu dan Cd pada lokasi II lebih tinggi dibandingkan dengan lokasi I. Konsentrasi logam Cu dalamsedimen berkisar antara 0,0028-0,0922 ppm, dan konsentrasi logam Cd dalam sedimen berkisar0,0022-0,2147 ppm Sedimen Sungai Brantas pada kedua lokasi penelitian dapat digolongkan padajenis fully sustained dimana sedimen mampu mensuplai solute kedalam air pori sehingga fluk soluteke pore water sama dengan fluk solute dari pore water ke prob DGT. Hal ini karena kecepatan diffusisolute dari partikel padat sedimen ke pore water sama dengan kecepatan diffusi solut dari pore wateke prob DGT. Sedimen pada kedua lokasi dapat dimasukkan dalam katagori fully unsustained. Darihasil penelitian ini dapat disimpulkan bahwa sedimen Sungai Brantas Hulu mempunyai peran yangtidak dapat berfungsi sebagai penyimpan logam Cu dan Cd di perairan.karena mudah melepaskanlogam kembali ke perairan.Kata kunci : Sedimen, Logam berat, Cu, Cd ,DGT

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Ding, Zhong Jun, Bao Hua Liu, Wei Gao e Xiang Mei Meng. "Analysis of Resistivity Characteristics of Sediments in Northwestern of South Yellow Sea". Applied Mechanics and Materials 568-570 (giugno 2014): 8–11. http://dx.doi.org/10.4028/www.scientific.net/amm.568-570.8.

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The resistivity characteristics of sediments are important to analyze marine sedimental environment and material source. A kind of penetration multiple parameter micro-probe which is designed to measure the resistivity of sediment sample in the northwestern of South Yellow Sea. In this paper, shelf sediment resistivity property off northwest of the South Yellow Sea is studied by analyzing the influence factors and relations, for providing valuable information to the marine sedimental environment around this area.

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Lahopang, Varrent Rivai Aclicyo, Sugeng Widada e Warsito Atmodjo. "Sebaran Ukuran Butir Sedimen di Muara Sungai Sragi Baru-Wonokerto, Kabupaten Pekalongan, Jawa Tengah". Indonesian Journal of Oceanography 5, n. 1 (15 febbraio 2023): 18–27. http://dx.doi.org/10.14710/ijoce.v5i1.15628.

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Pekalongan merupakan salah satu daerah di Jawa Tengah yang memiliki permasalahan erosi dan sedimentasi. Proses sedimentasi yang terjadi terus menerus akan menyebabkan pendangkalan dan akan mengurangi volume air yang tertampung di muara sungai. Sungai Sragi Baru merupakan salah satu sungai yang membawa sedimen dari hulu ke muara sungai dan menyebabkan terjadinya pendangkalan daerah muara. Sedimen yang masuk ke muara akan terdistribusikan oleh arus. Penelitian ini bertujuan untuk mengetahui distribusi jenis sebaran ukuran sedimen dasar di muara sungai Sragi Baru, Pekalongan. Metode yang digunakan dalam penelitian ini adalah metode kuantitatif dan penentuan lokasi pengambilan sampel sedimen menggunakan metode purposive sampling. Pengambilan sampel sedimen menggunakan sedimen grab dan data arus diambil menggunakan ADCP (Acoustic Doppler Current Profiler). Sampel dianalisis menggunakan metode pengayakan dan pemipetan. Pemodelan arus dan gelombang dianalisis melalui pendekatan model hidrodinamika-2D. Hasil penelitian didaptkan bahwa ukuran butir sedimen di muara sungai Sragi Baru berupa pasir, pasir lanau dan lanau. Sebaran sedimen dasar dipengaruhi oleh faktor oseanografi yaitu arus pasang surut dan arus sejajar pantai (longshore current).Kata kunci: Sedimen, Ukuran butir sedimen, Pasang surut, Arus, Muara sungai Sragi Baru Pekalongan is one of the areas in Central Java that has erosion and sedimentation problems. The sedimentation process that occurs continuously will cause siltation and reduce the volume of water stored in the river mouth. The Sragi Baru River is one of the rivers that carries sediment from upstream to the river mouth and causes silting of the estuary area. The sediment that enters the estuary will be distributed by the currents. This study aims to determine the size distribution of bottom sediment types in the estuary of the Sragi Baru River, Pekalongan. The method used in this study is a quantitative method and determining the location of sediment sampling using the purposive sampling method. Sediment sampling used sediment grab and current data was taken using the ADCP (Acoustic Doppler Current Profiler). Samples were analyzed using sieving and pipetting methods. Current and wave modeling are analyzed through a 2D hydrodynamic model approach. The results of the study found that the grain size of the sediment at the mouth of the Sragi Baru river consisted of sand, silt sand, and silt. The distribution of bottom sediments is influenced by oceanographic factors, namely tidal currents and longshore currents.Keywords: Sediment, Sediment grain size, Tides, Current, Sragi Baru river estuary

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Manengkey, Hermanto WK. "SEBARAN UKURAN BUTIRAN SEDIMEN GISIK SEKITAR GROIN PANTAI KALASEY". JURNAL PERIKANAN DAN KELAUTAN TROPIS 7, n. 3 (30 dicembre 2011): 132. http://dx.doi.org/10.35800/jpkt.7.3.2011.191.

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ABSTRACTThis study was conducted to examine the effectiveness of groins built along one of the littoral area in the coastal region of Manado. Logically, in this region the marine processes is strong enough to bring out the sediment, which is why in this area was built groin structures as shore protection. Groin is a structure designed to keep beach sand from being transported away by longshore current or to reduce the transportion of sand. This study was conducted by observing the size distribution of beach sediments around the groin in Kalasey beach. The groins on the Kalasey beach analized for their beach sediment samples were 8 units with 22 beach sediment sample collection spaces. Sediment samples were processed in the laboratory through washing and drying. The sediment was then separated with a sieve. Sediment left on each sieve is weighed and the weights were plotted. This study shows that the presence of groins in Kalasey beach was apparently quite effective to withhold the flow of sediment transport because of longshore current in this shore area.Keywords:.sediment size distribution, groin, Kalasey beach, Manado.ABSTRAKPenelitian ini dilaksanakan untuk melihat efektivitas groin yang dibangun di sepanjang litoral salah satu area dalam kawasan pantai Manado. Secara logis, pada kawasan ini proses laut cukup kuat dalam membawa sedimen keluar, itulah sebabnya sehingga pada kawasan ini dibangun struktur pelindung pantai berupa groin. Groin merupakan salah satu bangunan pelindung pantai yang direncanakan untuk menahan angkutan pasir oleh arus susur pantai (longshore current) atau mengurangi angkutan pasir. Penelitian ini dilakukan dengan mengamati keberadaan sebaran ukuran sedimen gisik yang terhampar di sekitar groin tersebut. Rangkaian groin di pantai Kalasey yang dianalisis sampel sedimen gisiknya adalah sebanyak 8 buah groin dengan 22 ruang pengambilan sampel sedimen. Sampel sedimen ditangani di laboratorium dengan melakukan pencucian dan pengeringan. Setelah kering, sedimen dipisahkan dengan ayakan. Sedimen yang tertinggal di masing-masing ayakan ditimbang dan hasilnya digambarkan dalam grafik peubah distribusi granulometri. Penelitian ini menunjukkan keberadaan groin di Kalasey ini tampaknya cukup efektif menahan laju arus susur pantai dalam mengangkut sedimen keluar dari kawasan pantai ini.Kata kunci: distribusi ukuran sedimen, groin, pantai Kalasey, Manado.

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Billy, Petrick, Jane M. Mamuaja, Royke M. Rampengan, Medy Ompi, Esry T. Opa e Joppy Mudeng. "Foraminifera On The Beach Of Malalayang Dua". JURNAL ILMIAH PLATAX 6, n. 2 (31 luglio 2018): 114. http://dx.doi.org/10.35800/jip.6.2.2018.20660.

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Beach as one on the landform that reflects the work of hydro-oceanographic factors, generally in the form of loose sedimentary material. Loose sediment is a collection of organic and inorganic particles that accumulate widely and are irregular in shape. One example of organism in marine waters that contributes to the availability of organic particles in the beach landform is foraminifera. Foraminifera is a single-celled organism that has the ability to form shells from substances of CaCO3 which originate from itself or from the surrounding environment. This study was aimed to classify physical sediments on the Malalayang Dua beach according to the points of sediment sampling, and see how the composition of foraminifera in the beach area and analyze the presence of foraminifera in relation to the granulometry of beach sediments. From the result of the study, it is found that the composition of grain size of sediment on the beach of Malalayang Dua is different, in stasion 1A, 1B, 2A, and 2B the sediment were mostly composed by fine grains while in station 3A and 3B were of coarse-grained sediment. A number of a species of foraminifera (dead test) was found in the study, and the number of tests was highes in fine sediments compared to coarse sediment.Keywords : Beach Landform, Malalayang Dua Coast, Foraminifera ABSTRAKGisik sebagai salah satu bentuklahan yang merefleksikan kerja faktor-faktor hidro-oseanografi, umumnya berwujud material sedimen lepas. Sedimen lepas adalah kumpulan partikel organik dan anorganik yang terakumulasi secara luas dan bentuknya tidak beraturan. Salah satu organisme di perairan laut yang berkontribusi terhadap ketersediaan partikel organik di gisik adalah foraminifera. Foraminifera merupakan organisme bersel tunggal yang mempunyai kemampuan membentuk cangkang dari zat-zat CaCO3yang berasal dari dirinya sendiri atau dari lingkungan sekitarnya. Penelitian ini bertujuan untuk mengelompokkan sedimen gisik di pantai Malalayang Dua menurut titik-titik pengambilan sampel sedimen, dan melihat bagaimana komposisi foraminifera di kawasan gisik serta menganalisis keberadaan foraminifera dalam kaitannya dengan granulometri sedimen gisik. Dari hasil penelitian komposisi ukuran butir sedimen pada lahan gisik di pantai Malalayang Dua berbeda menurut stasiun yang ditetapkan, di ruang pantai ke arah Timur yaitu stasiun 1A, 1B, 2A, 2B komposisi sedimennya berukuran halus, sedangkan di ruang pantai ke arah Barat yaitu stasiun 3A dan 3B komposisi sedimennya berukuran kasar, komposisi sedimen di setiap stasiun gisik litoral dan sublitoral menampilkan adanya perbedaan tingkat kekasaran partikel sedimen. Dari hasil penelitian ditemukan 9 cangkang foraminifera. Pada komposisi sedimen gisik yang berukuran halus ditemukan jumlah cangkang foraminifera yang lebih banyak dibandingkan dengan gisik yang komposisi sedimen berukuran kasar.Kata kunci : Lahan Gisik, Pantai Malalalayang Dua, Foraminifera

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Zallesa, Sheilla, Kresna Tri Dewi e Noor C. D. Aryanto. "THE CORRELATION BETWEEN BENTHIC FORAMINIFERA AND SEDIMENT TYPES OF SOUTH MAKASSAR STRAIT". BULLETIN OF THE MARINE GEOLOGY 29, n. 2 (15 febbraio 2016): 53. http://dx.doi.org/10.32693/bomg.29.2.2014.65.

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South Makassar Strait is located between Kalimantan and Sulawesi Islands that is an important oceanographic pathway connecting between the Pacific and Indian oceans. This area is a part of sedimentary basin that has specific seabed morphology and sediment characteristics, including foraminifera as a component of sediments. The purpose of this study is to determine community structure of benthic foraminifera related to sediment characteristics. This study used 20 top core sediment samples from water depth between 200 and 1500 m. There are identified 38 species of benthic foraminifera and some of them are characterized the study area: Anomalinoides colligerus, Lenticulina suborbicularis, Planulina wuellerstorfi, , and Pseudonodosaria discrete. The diversity index is categorized as moderate values (1.0=H'= 3) and the average of evenness values is about 0.79. The dominance values are less than 0.5 indicate that there is no dominant species in the study area. In relation to sediment characteristics, it shows that the high abundance of benthic foraminifera occurs in sediment type of silty sand and sandy silt. Moderate abundance appears in sand following by low abundance in silt and sandy silt sediment types. Keywords: benthic foraminifera, community structure, sediment types and Makassar Strait Makassar bagian selatan terletak diantara Pulau Kalimantan dan Sulawesi yang merupakan jalur oseanografik yang penting menghubungkan Samudera Pasifik dan. Wilayah ini merupakan bagian dari cekungan sedimen yang mempunyai morfologi dasar laut dan karakteristik sedimen tertentu termasuk foraminifera sebagai komponen sedimen. Tujuan dari penelitian ini adalah untuk mengetahui struktur komunitas foraminifera bentik dalam kaitannya dengan tipe sedimen dasar laut. Penelitian ini menggunakan 20 sampel sedimen bagian atas dari pemercontoh inti pada kedalaman antara 200 dan 1500 m. Ada 38 spesies foraminifera bentik dan beberapa diantaranya mencirikan daerah penelitian: Anomalinoides colligerus, Lenticulina suborbicularis, Planulina wuellerstorfi, dan Pseudonodosaria discrete. Indeks keanekaragaman termasuk dalam kategori sedang (1,0=Hâ€™=3) dan nilai rata-rata keseragaman sekitar 0,79. Nilai dominasi lebih kecil dari 0,5 itu menandakan tidak ada spesies yang dominan pada lokasi penelitian. Terkait dengan karakteristik sedimen menunjukkan bahwa kelimpahan foraminifera bentik tinggi terdapat pada jenis sedimen pasir lanauan dan lanau pasiran. Kelimpahan sedang ditemukan pada jenis sedimen pasir diikuti kelimpahan rendah yang dijumpai pada sedimen lanau dan lanau pasiran. Kata kunci: foraminifera bentik, struktur komunitas, jenis sedimen, Selat Makassar.

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huda putra pratama, Miftachul, Anugrah Ricky Wijaya e Irma Kartika Kusumaningrum. "Fraksisanasi dan distribusi keterikatan seng dalam sedimen Sendang Biru menggunakan metode BCR sonifikasi (The Bureau Community Of Reference)". Jurnal MIPA dan Pembelajarannya 2, n. 2 (17 novembre 2021): 95–99. http://dx.doi.org/10.17977/um067v2i2p95-99.

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The density of anthropogenic activity in the port of blue fish leads to the contribution of heavy metals in sediments. The method of leaching is an important method to dissolve all zinc in the sediment precision and accuracy. Research on zinc levels in sediments has been widely practiced, but fractionation and distribution of zinc attachment in Blue Spring sediment using BCR Sonification. The results of the zinc analysis using BCR Sonification method gave precision value of 0.49 percent, and accuracy of 91.20 percent, the results showed that BCR method has high precision and accuracy value. The fractionation of zinc metal in the sediments shows that zinc is dominant in non-resistant (1) fractions comprising an ion exchange fraction, (2) carbonate bound fraction, (3) reduction fraction and (3) an oxidation fraction with a percentage of 10.16 percent; 23.52 percent; 21.25 percent. Whereas in the fraction resistant or residual fraction the concentration of zinc in the sediment was 45.07%. The distribution of zinc levels in sediments at nine locations in Sendang Biru ranged from 36.6 mg/kg - 239,78mg/ kg indicating that the Blue Sendang sediment was partly contaminated from anthropogenic because the zinc levels had exceeded the ereference of 120 mg/ kg. Padatnya kegiatan antropogenik di pelabuhan ikan sendang biru menyebabkan adanya kontribusi seng dalam sedimen. Metode leaching merupakan metode yang penting untuk melarutkan semua seng dalam sedimen secara presisi dan akurasi. Penelitian kadar seng dalam sedimen telah banyak dilakukan, tetapi fraksinasi dan distribusi keterikatan seng dalam sedimen Sendang Biru menggunakan metode BCR Sonifikasi. Hasil penelitian analisis seng menggunakan metode BCR Sonifikasi memberikan nilai presisi sebesar 0,49 persen, dan akurasi sebesar 91,20 persen, hasil tersebut menunjukkan bahwa metode BCR memiliki nilai presisi dan akurasi yang tinggi. Fraksinasi logam seng dalam sedimen menunjukkan bahwa seng dominan pada fraksi non resisten yang terdiri dari fraksi (1) pertukaran ion, (2) fraksi terikat karbonat, (3) fraksi reduksi, dan (4) fraksi oksidasi dengan presentase sebesar 10,16 persen; 23,52 persen; 21,25 persen, sedangkan pada fraksi resisten atau fraksi residu konsentrasi seng dalam sedimen adalah 45,07 persen. Distribusi kadar seng dalam sedimen pada sembilan lokasi di Sendang Biru berkisar antara 36,6mg/kg - 239,78mg/kg. Hal ini menunjukkan bahwa sedimen Sendang Biru sebagian terkontaminasi dari antropogenik dengan kadar melebihi ambang batas yaitu sebesar 120 mg/kg.

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Lazuardi, Mirza Fredyaniza, Lilik Maslukah e Sugeng Widada. "Analisis Karbon Organik Total Pada Sedimen Dasar di Muara Sungai Banger Pekalongan Jawa Tengah". Indonesian Journal of Oceanography 4, n. 3 (28 agosto 2022): 86–95. http://dx.doi.org/10.14710/ijoce.v4i3.14976.

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Sungai Banger terletak di kecamatan Pekalongan Utara yang merupakan sungai dengan banyak aktivitas manusia seperti pemukiman, industri, pertambakan, pertanian, dan aktivitas perikanan di sepanjang aliran sungainya. Banyak limbah dari aktivitas tersebut berakhir di sungai. Bahan organik yang terkandung di dalam limbah apabila melebihi ambang batas dapat menyebabkan perairan yang eutrofik. Konsentrasi karbon organik pada sedimen dapat dijadikan indikator untuk mengetahui kualitas perairan. Penelitian ini bertujuan untuk mengetahui sebaran karbon organik total (KOT) dan hubungannya dengan jenis dan statistik sedimen. Analisis yang dilakukan meliputi analisis KOT dengan metode LOI (Loss of Ignition), Analisis ukuran butir sedimen, statistik sedimen, pasang surut dan arus permukaan. Hasil penelitian menunjukan Muara Sungai Banger didominasi oleh fraksi sedimen lanau dengan konsentrasi KOT berada dalam kategori sedang-tinggi di angka 5,1% 21,63%. Korelasi antara KOT dengan jenis dan statistik sedimen dapat dianalisis dengan SPSS menggunakan metode bivariat pearson. KOT memiliki nilai pearson correlation yang positif terhadap fraksi lanau (0.884). KOT banyak ditemui pada sedimen yang memiliki ukuran butir halus yang lebih mudah untuk mengadsorpsi karbon yang ada di perairan. Nilai pearson correlation antara KOT dengan nilai mean menunjukan hubungan yang negatif (-0.813). Nilai mean yang tinggi menunjukan bahwa ukuran butir sedimen yang lebih kasar, artinya apabila nilai mean sedimen semakin besar maka KOT yang ditemukan semakin rendah konsentrasinya.Kata kunci : Karbon Organik Total, Ukuran Butir, Statistik Sedimen, Muara Sungai Banger Abstract The Banger River is located in the North Pekalongan sub-district, a river with many human activities such as human settlement, industry, aquaculture, agriculture, and fishing activities along its river. Much of the waste from these activities end up in rivers. If it exceeds the threshold, the organic matter contained in the waste can cause eutrophic waters. Carbon concentration in sediment can be used as an indicator to determine water quality. This study aims to determine the distribution of total organic carbon (TOC) and its correlation with sediment type and sediment statistics. This research was carried out on August 24, 2021. The analysis includes TOC analysis using the LOI (Loss of Ignition) method, sediment grain size analysis, sediment statistics, tides, and surface currents. The results showed that the Banger River Estuary was dominated by the silt sediment fraction with organic carbon concentrations in the medium-high category at 5.1% to 21.63%. The correlation between TOC and sediment type and sediment statistics can be analyzed by SPSS using the Pearson bivariate method. TOC has a positive Pearson value correlation with the silt sediment fraction (0.884). TOC is mostly found in sediments that have a fine grain size that is easier to adsorb carbon in the waters. The Pearson correlation value between TOC and the mean value shows a negative relationship (-0.813). A high mean value indicates that the grain size of the sediment is coarser, meaning that if the mean sediment value increases, the TOC found will be lower in concentration. Keywords: Total Organic Carbon, Grain Size, Sediment Statistics, Banger River Estuary

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Aliandu, Richardus Ade Satria, Rr Sri Yulina Wulandari e Baskoro Rochaddi. "Studi Sebaran Sedimen Feromagnetik Di Perairan Muara Sungai Sambong, Batang". Indonesian Journal of Oceanography 4, n. 4 (31 gennaio 2023): 74–86. http://dx.doi.org/10.14710/ijoce.v4i4.15578.

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Abstrak Sungai Sambong berada di wilayah kabupaten Batang, provinsi Jawa Tengah, dan muaranya dijadikan sebagai pelabuhan kota Batang. Sungai Sambong memiliki hulu yang terletak di kawasan pegunungan Dieng yang memiliki kawah aktif. Karena hal itu umumnya terdapat kandungan mineral feromagnetik. Penelitian ini bertujuan mencari tahu kandungan mineral feromagnetik pada sedimen yang terdapat di kawasan muara sungai Sambong. Sedimen diambil di sekitar wilayah perairan muara sungai Sambong, dan dicari tahu persentase kandungan feromagnetiknya dan dicari juga kandungan butir yang terdapat pada sedimen tersebut. Sebaran mineral sedimen pada perairan dicari faktor penyebabnya dan diolah dengan menggunakan analisa pemodelan komputer.Hasil analisa kandungan sedimen feromagnetik didapatkan kandungan terbesar pada daerah muara sungai dengan kadar 12,528% dan kandungan terkecil pada perairan di sebalah Utara muara dengan kadar 1,023%. Kandungan butir sedimen yaitu pasir, lanau dan lanau pasiran. Kecepatan arus pada bulan April 2022 berkisar antara 0.065581 m/s sampai 0.215389 m/s dengan arah dominan yaitu Selatan dan Tenggara. Penelitian ini dapat dijadikan sebagai sumber data untuk mendukung penelitian dan pengembangan mengenai studi kandungan feromagnetik pada sedimen serta persebarannya di periran Muara Sungai Sambong, Batang.Kata kunci : Sedimen Feromagnetik, Butir Sedimen, Pola Arus, Model Sedimen, Muara Sungai Sambong Batang.Abstract The Sambong River is located in the Batang district, Central Java province, and its estuary is used as the port of the city of Batang. The Sambong River has an upstream which is located in the Dieng mountain area which has an active crater. Because it generally contains ferromagnetic minerals. This study aims to find out the ferromagnetic mineral content in sediments in the Sambong river estuary area. Sediment was taken around the waters of the Sambong river estuary, and sought to know the percentage of ferromagnetic content and also looked for grain content contained in the sediment. The distribution of sedimentary minerals in the waters was searched for the causative factors and processed using computer modeling analysis. 528% and the smallest content in the waters north of the estuary with a level of 1.023%. The content of sediment grains is sand, silt and sandy silt. Current velocity in April 2022 ranges from 0.065581 m/s to 0.215389 m/s with the dominant directions being South and Southeast. This research can be used as a source of data to support research and development regarding the study of ferromagnetic content in sediments and their distribution in the waters of the Sambong River Estuary, Batang.Keywords : Ferromagnetic Sediment, Sediment Grain, Flow Pattern, Sediment Model, Sambong Batang River Estuary.

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Kusnida, Dida, e Tommy Naibaho. "LATE NEOGENE SEISMIC STRUCTURES OF THE SOUTH BATANTA BASIN, WEST PAPUA". BULLETIN OF THE MARINE GEOLOGY 29, n. 1 (15 febbraio 2016): 11. http://dx.doi.org/10.32693/bomg.29.1.2014.61.

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Study on multi-channel seismic records from South Batanta Basin, West Papua acquired during RV Geomarin III cruise in 2013 were aimed to invent and map geological aspects and for geo-tectonic and geological history studies. Seismic data indicate that sediment sequences which can be observed from our seismic system in the study area are characterized by pre-extension sediments (Lower Early Miocene-Upper Early Pliocene), syn-extension sediments (Lower Middle Pliocene-Upper Late Pliocene), post-extension sediments (Early Pleistocene), and syn-inversion sediments (Late Pleistocene-Recent) typical of the West Papua tectonic system. In the study area, sediment sequences are possibly characterized by clastical sedimentary cover such as slumps, debrites and turbidites. Key words: South Batanta Basin, seismic sequence, tectonic, faults, clastical sediments. Studi rekaman seismik multi kanal dari Cekungan Batanta Selatan, Papua Barat yang diperoleh selama pelayaran KR Geomarin III pada tahun 2013 bertujuan untuk menginventarisir dan memetakan aspek-aspek geologi serta untuk studi geo-tektonik dan sejarah geologi. Data seismik menunjukkan bahwa urutan sedimen yang dapat diamati dari sistem seismik di daerah studi ditandai oleh sedimen pra-ekstensi (Miosen Awal Bagian Bawah-Pliosen Awal Bagian Atas), sedimen syn-ekstensi (Pliosen Tengah Bagian Bawah-Pliosen Akhir Bagian Atas), sedimen post-ekstensi (Plestosen Awal), dan sedimen syn-inversi (Pleistosen Akhir-Resen) tipikal sistem tektonik Papua Barat. Di daerah studi, urutan sedimen dicirikan oleh sedimen penutup klastika kemungkinan berupa slump, debrit dan turbidit. Kata kunci: Cekungan Batanta Selatan, sekuen seismik, tektonik, sesar, sedimen klastika.

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Cunanda, Yana, Runi Asmaranto e Prima Hadi Wicaksono. "Studi Evaluasi Pengerukan Sedimen Pada Central Sediment Sump di Lokasi Penambangan Emas PT. Bumi Suksesindo Kabupaten Banyuwangi". Jurnal Teknologi dan Rekayasa Sumber Daya Air 1, n. 1 (31 gennaio 2021): 1–16. http://dx.doi.org/10.21776/ub.jtresda.2021.001.01.01.

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Central Sediment Sump merupakan kolam pengendapan sedimen terbesar di Penambangan Emas PT. Bumi Suksesindo. Central Sediment Sump menampung sedimen dari kawasan Central Waste Dump (CWD), Pit E, dan Pit B West. Adanya peningkatan produksi bijih mulai tahun 2018 menjadikan laju penambangan hingga 8,1 juta ton/tahun. Peningkatan ini mengakibatkan meningkatnya laju sedimen yang ditampung Central Sediment Sump. Evaluasi yang dilakukan pada studi ini berdasarkan pada jumlah volume sedimen terkeruk selama tahun 2018 terhadap volume sedimen yang tertangkap di Central Sediment Sump. Volume sedimen yang berasal dari hasil erosi di daerah tangkapan air Central Sediment Sump akan tertangkap di Central Sediment Sump. Volume sedimen terkeruk tergantung pada ukuran bucket excavator, waktu siklus excavator, dan waktu kerja excavator. Waktu kerja excavator menggambarkan waktu yang diperlukan untuk memindahkan volume sedimen yang sudah ditentukan. Hasil evaluasi pengerukan sedimen akan menggambarkan cukup atau tidaknya pengerukan sedimen tahun 2018 untuk mengeruk sedimen yang tertangkap di Central Sediment Sump. Berdasarkan hasil studi ini diperoleh volume sedimen yang tertangkap di Central Sediment Sump sebesar 2.004.551,730 m3. Volume sedimen terkeruk selama tahun 2018 sebesar 11.755,310 m3. Sehingga pengerukan sedimen tahun 2018 tidak mencukupi untuk mengeruk seluruh volume sedimen yang tertangkap di Central Sediment Sump.

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Alkautsar, Millenia Dinda, Chrisna Adhi Suryono e Ibnu Pratikto. "Korelasi antara Ukuran Butir Sedimen Non Pasir dengan Kandungan Bahan Organik di Perairan Morodemak, Kabupaten Demak". Journal of Marine Research 11, n. 3 (6 luglio 2022): 391–98. http://dx.doi.org/10.14710/jmr.v11i3.35020.

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Perairan Morodemak merupakan salah satu perairan yang memiliki berbagai macam aktivitas masyarakat dimulai dari aktivitas Pelabuhan dan TPI, jalur lintas perahu nelayan hingga pembuangan limbah domestik maupun industri. Adanya aktivitas tersebut dapat menyebabkan perubahan sebaran ukuran butir dan kandungan bahan organik. Penelitian ini memiliki tujuan untuk mengetahui jenis dan klasifikasi sedimen serta jumlah kandungan bahan organik yang terdapat dalam sedimen non pasir di Perairan Morodemak, Demak. Pengambilan data pada penelitian ini yaitu pengambilan data berupa sampel sedimen dengan menggunakan sediment core. Dilanjutkan dengan analisa sampel sedimen dan analisa kandungan bahan organik. Hasil penelitian menunjukkan bahwa di perairan Morodemak, Demak memiliki konsentrasi kandungan bahan organik sebesar 2,72-7,56% yang termasuk dalam kriteria sangat rendah-rendah. Hubungan persentase non pasir dengan bahan organik yang terdapat dalam partikel pasir memiliki korelasi positif (+) yang terbilang besar dengan nilai fraksi silt pada kedalaman 0 cm sebesar 79,0% dan kedalaman 30 cm sebesar 66,6%, dimana semakin besar persentase sedimen non pasir (silt dan clay) maka garis linear yang terbentuk semakin naik, bahan organik yang terkandung di dalam partikel sedimen semakin tinggi.Morodemak coastal waters is one of the waters that has various kinds of community activities starting from port and fish market activities, fishing boat track to the disposal of domestic and industrial waste. The existence of these activities can cause changes in the distribution of grain size and organic matter content. This study aims to determine the type and classification of sediments and the amount of organic matter contained in non-sand sediments in Morodemak waters, Demak. Data collection in this study is data collection in the form of sediment samples using a sediment core. Followed by an analysis of sediment samples and analysis of organic matter content. The results showed that in Morodemak waters, Demak has a concentration of organic matter content of 2.72-7.56% which is included in the very low-low criteria. The relationship between the percentage of non-sand and organic matter contained in sand particles has a fairly large positive correlation (+) with a relatively large correlation with the value of the silt fraction at a depth of 0 cm of 79.0% and a depth of 30 cm by 66.6%, where the greater the percentage of non-sand sediment (silt and clay) the linear line formed increases, the organic matter contained in the sediment particles is higher.

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Simboh, Reyvalentin, Royke M. Rampengan, Hermanto W. K. Manengkey, Rignolda Djamaluddin, Esry T. Opa e Hengky J. Sinyal. "Sediment Granulometry of the Beach at the Kalasey’s Groynes". Jurnal Ilmiah PLATAX 9, n. 2 (7 agosto 2021): 234. http://dx.doi.org/10.35800/jip.9.2.2021.34778.

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Coastal areas have the potential to be developed and utilized for various purposes. However, the intensity of coastal use can result in the degradation of the coastal environment. Therefore, management of the coastal areas is often carried out by building shore protective structures, including groynes. The placement of a structure in the form of a groynes is primarily intended to block littoral flow in moving sediment out of certain places in the shore. Therefore, the placement of groynes on the shore needs to be followed by a study to find out the effectiveness of the groynes. The effectiveness of groynes can be determined, among others, by a study on the granulometry of sediments on the beach. This study was conducted to describe the composition of the sediment and to analyze granulometry distribution in several places at the beach around the groynes on the shore of Kalasey. The study of the physical sediments around the Kalasey groynes was carried out through a study of the sediment samples from October 30, 2020, to April 27, 2021. Sediment sampling was carried out at 6 stations which have been determined on the surface of the beach formed around the groynes. The results obtained through this research showed that the composition of the sediments in the beach around the Kalasey groynes consisted of size classes as follows: very fine sand, fine sand, medium sand, coarse sand, very coarse sand, granule, and pebble. Fine-sized materials at the beach which is located in the groynes on further east have increased in composition. Based on the granulometric analysis of the sediment, it is indicated that the erosion and deposition processes occur alternately in the beaches formed around the groynes.Keywords: Beach; Kalasey Groynes; Sediment Composition; Granulometric AnalysisAbstrakWilayah pantai memiliki potensi untuk dikembangkan dan dimanfaatkan untuk berbagai kepentingan. Walaupun demikian, intensivitas pemanfaatan pantai dapat mengakibatkan terjadinya degradasi lingkungan pantai. Oleh karena itu, dalam rangka pengelolaan pantai seringkali dilakukan dengan cara membangun struktur pelindung pantai, diantaranya berupa groin. Penempatan struktur berupa groin di kawasan pantai, dimaksudkan utamanya untuk menghadang aliran litoral dalam memindahkan sedimen keluar dari tempat tertentu di kawasan pantai. Oleh karena itu, penempatan groin di pantai perlu diikuti dengan kajian untuk melihat efektivitas fungsi groin pada kawasan pantai tersebut. Salah satu cara untuk melihat efektivitas kerja groin di pantai adalah melalui kajian menyangkut granulometri sedimen gisik yang terhampar di sekitar groin yang ditempatkan. Penelitian ini dilakukan dengan tujuan mendeskripsikan komposisi sedimen dan menganalisis distribusi granulometri di beberapa tempat pada gisik sekitar groin di pantai Kalasey. Kajian terhadap sedimen gisik sekitar groin Kalasey dilakukan melalui telaah terhadap sampel sedimen yang dicuplik mulai 30 Oktober 2020 sampai dengan 27 April 2021. Pencuplikan sedimen dilaksanakan di 6 stasiun yang ditetapkan pada permukaan gisik yang terbentuk di sekitar groin Kalasey. Hasil yang diperoleh melalui penelitian ini adalah komposisi sedimen pada gisik di sekitar groin Kalasey terdiri dari kelas ukuran berupa pasir sangat halus, pasir halus, pasir sedang, pasir kasar, pasir sangat kasar, granul, dan kerakal. Gisik yang terletak pada kawasan groin semakin ke arah Timur pada kawasan ini, komposisi sedimennya mengalami peningkatan jumlah material sedimen yang berukuran halus. Berdasarkan analisis granulometri sedimen terindikasi bahwa proses erosi dan deposisi terjadi secara bergantian pada gisik-gisik yang terbentuk di sekitar groin.Kata kunci: Gisik; Groin Kalasey; Komposisi Sedimen; Analisis Granulometri

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Usman, Ediar. "A COMPARISON OF MAJOR ELEMENTS BETWEEN MARINE SEDIMENTS AND IGNEOUS ROCKS: AS A BASIC DETERMINATION OF THE SEDIMENT SOURCE AT UJUNG PENYUSUK WATERS, NORTH BANGKA,BANGKA BELITUNG PROVINCE". BULLETIN OF THE MARINE GEOLOGY 25, n. 1 (15 febbraio 2016): 1. http://dx.doi.org/10.32693/bomg.25.1.2010.20.

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Three igneous rock samples from the coast and five sediments from the marine of Ujung Penyusuk Waters have been used for chemistry analysis as the basic determination of sediment source. The result of chemistry analysis shows that the major element with relatively same pattern. In the igneous rock samples, the result of chemistry analysis shows the SiO2 ranges between 72.3 - 76.8%, Al2O3 (9.64 - 11.64%), and Fe2O3 ( 2.08 - 2.18%). In the marine sediment, the content of SiO2 is between 62.2 and 66.5%, Al2O3 (2.93 - 3.63%) and Fe2O3 (21.19 - 24.40%). Other elements such as CaO, MgO, K2O, Na2O and TiO2 are relatively similar values in all samples. The difference of element content in marine sediment and coastal igneous rock occurs in Al2O3 and Fe2O3. The Al2O3 is small in marine sediment while the Fe2O3 is higher compared to igneous rocks. Decreasing of the Al2O3 (kaolinite) in the marine sediment is caused by the character of the Al2O3 that was derived from quartz rich of igneous rocks forming kaolinite. It was than deposited in the sea floor. Increasing of the Fe2O3 in marine sediment is caused by addition reaction of the Fe from the sea. Generally, the content of the SiO2 (quartz) in igneous rock and marine sediment belongs to the same group source that is acid igneous rock. The SiO2 in the sediment belongs to a group of granitoid. Keywords: major elements, marine sediment, igneous rock, Ujung Penyusuk waters Tiga contoh batuan dari pantai dan lima contoh sedimen dari dasar laut di perairan Ujung Penyusuk, Bangka Utara telah digunakan untuk analisis kimia sebagai dasar dalam penentuan sumber sedimen. Hasil analisis kimia menunjukkan kandungan unsur utama dengan pola yang relatif sama. Pada contoh batuan beku, hasil analisis kimia memperlihatkan kandungan SiO2 antara 72,3 - 76,8%, Al2O3 (9,64 â€“ 11,64%) dan Fe2O3 (2,08 - 2,18%). Pada sedimen dasar laut memperlihatkan kandungan SiO2 antara 62,2 â€“ 66,5%, Al2O3 (2,93 â€“ 3,63%) dan Fe2O3 (21,19 - 24,40%). Unsur lainnya seperti CaO, MgO, K2O, Na2O dan TiO2 yang relatif sama pada seluruh contoh. Perbedaan kandungan pada sedimen dasar laut dan batuan beku di pantai terjadi pada unsur Al2O3 dan Fe2O3. Kandungan Al2O3 pada sedimen dasar laut lebih kecil dan Fe2O3 lebih besar dibandingkan pada batuan beku. Berkurangnya Al2O3 (kaolin) pada sedimen dasar laut disebabkan oleh sifat Al2O3 yang berasal dari rombakan batuan beku yang kaya kuarsa (SiO2) membentuk kaolin. Unsur tersebut kemudian diendapkan di dasar laut. Peningkatan Fe2O3 pada sedimen dasar laut disebabkan oleh penambahan unsur Fe2O3 yang mengikat unsur Fe dari berbagai mineral di laut. Secara umum, kandungan SiO2 (kuarsa) dalam batuan beku dan sedimen dasar laut termasuk dalam kelompok yang relatif sama yaitu batuan beku asam. SiO2 dalam sedimen termasuk kelompok granitoid. Kata kunci: senyawa utama, sedimen dasar laut, batuan beku, Perairan Ujung Penyusuk.

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Maramis, Michelle, Sugeng Widada e Gentur Handoyo. "Pengaruh Influks Sedimen dari Sungai Terhadap Distribusi Ukuran Butir Sedimen Dasar di Perairan Slamaran, Pekalongan, Jawa Tengah". Indonesian Journal of Oceanography 4, n. 2 (21 maggio 2022): 01–11. http://dx.doi.org/10.14710/ijoce.v4i2.14007.

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Perairan Slamaran di Kota Pekalongan, Jawa Tengah merupakan area multi fungsi seperti alur layar, perikanan tangkap, dan wisata bahari. Untuk mendukung keberlangsungan zona pemanfaatan wilayah perairan tersebut, maka kondisi fisik perairan dan pantai perlu diketahui dengan baik. Salah satu kondisi fisik tersebut adalah sedimen dasar perairan. Keberadaan Sungai Banger dan Sungai Loji yang bermuara ke Perairan Slamaran dan membawa material sedimen diduga berpengaruh terhadap sebaran sedimen di perairan tersebut. Penelitian ini bertujuan untuk mengetahui influks sedimen dari kedua sungai kaitannya dengan pola distribusi ukuran butir sedimen dasar di Perairan Slamaran. Analisis ukuran butir dilakukan dengan metode granulometri untuk mendapatkan data statistik distribusi ukuran butir yaitu mean, sortasi, skewness, dan kurtosis. Influks sedimen dari sungai ditentukan berdasarkan debit dan kandungan sedimen dalam air sungai. Arus laut diperoleh dari peramalan arus pasut menggunakan perangkat lunak MIKE21. Hasil penelitian menunjukan bahwa sedimen di sungai didominansi oleh lanau pasiran, sedangkan di muara didominansi oleh pasir lanauan. Sementara pada pantai aontara Sungai Loji dan Sungai Banger didominansi oleh pasir. Selanjutnya ke arah laut lepas sedimen lanau semakin banyak. Secara umum sedimen tersebut mempunyai nilai mean berkisar antara 0,045 – 1,735, dengan sortasi very well, kondisi skewness adalah very coarse skewness hingga very fine skewness, dan kurtosis pada sedimen bervariasi dari mesokurtic, leptokurtic, dan very leptokurtic. Debit suspensi pada 4 titik pengukuran berkisar dari 0.008 – 0.079 kg/s. Kecepatan arus pasut pada perairan ini memiliki besar kecepatan 0.002 sampai 0.012 m/s. Pola arus yang digunakan sesuai dengan waktu penelitian adalah arus yang bergerak dari surut menuju pasang sesuai waktu sampling. Arus dengan kecepatan yang besar diduga dapat membawa material sedimen lebih banyak dengan butiran yang lebih kasar. Kata kunci: Sedimen, Statistik Butiran, Debit Suspensi, Arus Pasang Surut, Perairan Slamaran Abstract Slamaran waters in Pekalongan City, Central Java is a multi-functional area such as cruise line, capture fisheries, and beach tourism. To support the sustainability of the zone of the waters, the physical conditions of the waters and beaches need to be well known. One of these physical conditions is the seabed sediment of the waters.. The existence of the Banger River and Loji River which empties into the Slamaran Waters and carries sedimentary materials that affect the sediment in these waters. This study aims to determine the sediment influx from the two rivers related to the grain size distribution of sediments in the Slamaran waters. The grain size analysis by using the granulometric method to obtain statistical data on the grain size distribution namely mean, sorting, skewness, and kurtosis. Sediment influx from the river is determined based on the discharge and the content in the sediment in the river water. Ocean currents are obtained from tidal current forecasting using MIKE21 software. The results showed that the seabed sediment in the river is dominated by sandy silt, while in the estuary it is dominated by silty sand. Meanwhile, on the coast between the Loji River and the Banger River, sand is dominated. Furthermore, towards the open sea, the silt sediment is increasing. In general, the sediment has a mean value ranging from 0.045 - 1.735, with very well sorting, skewness value are very coarse skewness to very fine skewness, and the kurtosis in sediments varies from mesokurtic, leptokurtic, and very leptokurtic. The suspension discharge at 4 measurement points ranged from 0.008 – 0.079 kg/s. The speed of tidal currents in these waters has a speed of 0.002 to 0.012 m/s. The current pattern used according to the time of the study is the current that moves from low tide to high tide according to the sampling time. Currents with high speeds are thought to be able to carry more sedimentary material with coarser grains. Keywords: Sediment, Statistical Granular, Suspension Discharge, Tidal Current, Slamaran Waters

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Yudha, Gadisza Asmara, Chrisna Adhi Suryono e Adi Santoso. "Hubungan antara Jenis Sedimen Pasir dan Kandungan Bahan Organik di Pantai Kartini, Jepara, Jawa Tengah". Journal of Marine Research 9, n. 4 (22 novembre 2020): 423–30. http://dx.doi.org/10.14710/jmr.v9i4.29020.

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Pantai Kartini merupakan salah satu kawasan wisata di Kabupaten Jepara. Berbagai aktifitas masyarakat serta infrastruktur perairan menjadi kebutuhan yang sangat krusial dengan letak Pantai Kartini. Adanya aktivitas dan bangunan dapat menyebabkan perubahan sebaran ukuran butir dan kandungan bahan organik. Penelitian ini memiliki tujuan untuk mengetahui jenis dan klasifikasi sedimen serta jumlah kandungan bahan organik yang terdapat dalam sedimen di Pantai Kartini, Jepara. Pengambilan data pada penelitian ini yaitu pengambilan data primer yang berupa sampel sedimen dengan menggunakan sediment core. Dilanjutkan dengan analisis sampel sedimen dan analisis kandungan bahan organik. Hasil penelitian menunjukkan bahwa di perairan Pantai Kartini, Jepara memiliki jenis sedimen pasir (sand) dimana nilai ukuran butir tersebut berkisar dari 81-96%, yang mana pada Stasiun 1 rata-rata sebesar 91,6-96%, Stasiun 2 rata-rata sebesar 93,5-96,9%, dan Stasiun 3 rata-rata sebesar 81,4-92,9%. Sedangkan, Kandungan Bahan Organik yang terdapat di perairan tersebut memiliki konsentrasi berkisar dari 5-14% yang termasuk dalam kriteria rendah-sedang, dimana pada Stasiun 1 rata-rata sebesar 10,9-13,3%, Stasiun 2 rata-rata sebesar 5,92-10,18%, dan Stasiun 3 rata-rata sebesar 7,7-14%. Kartini Beach is one of the tourist areas in Jepara Regency. Various community activities and water infrastructure have become crucial needs in Kartini Beach. The existence of activities and buildings can cause changes in the distribution of grain size and content of organic matter. This study aims to determine the type and classification of sediments and the amount of organic matter content contained in sediments in Kartini Beach, Jepara. Data collection in this study is primary data collection in the form of sediment samples using sediment cores. Followed by analysis of sediment samples and analysis of organic matter content. The results showed that in Kartini Coast waters, Jepara had a sand sediment type where the grain size values ranged from 81-96%, which at Station 1 averaged 91,6-96%, Station 2 on average amounted to 93,5-96,9%, and Station 3 averaged 81,4-92,9%. Meanwhile, the content of organic matter contained in these waters has concentrations ranging from 5-14% which are included in the criteria of low-moderate, where at Station 1 an average of 10,9-13,3%, Station 2 an average of 5,92-10,18%, and Station 3 averaging 7,7-14%.

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40

Chang, Chang Shen, A. H. Yusoff, C. A. R. Mohamed, S. F. Liu, N. F. Shoparwe, N. A. Husain e M. N. Azlan. "Geochemistry of Rare Earth Elements in Pahang River Sediment, Malaysia". Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 331, n. 4 (25 gennaio 2024): 42–50. http://dx.doi.org/10.31643/2024/6445.37.

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Rare earth elements (REE) are a set of 17 chemically similar metallic elements including 15 lanthanides, scandium and yttrium. The current status of REE as a global strategic commodity has encouraged the identification of REE ore deposits. This research is carried out to identify the mining feasibility of fluvial sediment REE and to understand the sediment's physical and chemical characteristics and effects on the geochemical behaviour of REE in the longest river of Peninsular Malaysia namely Pahang River. Surface sediment samples were collected along Pahang River (n=44) in approximately 10 km distance intervals. The sediment samples were analyzed using XRF to determine the major oxide content. Meanwhile, REE content in the sediment samples was extracted using the Total Digestion method and analysed using ICP-MS. The results show the average value of ΣREE at surface sediments of the Pahang River is 42.58 ppm and can be considered too low to be economically mined. Each area shows higher fractionation of light REE than heavy REE with negative europium anomalies, suggesting sediments in this area were derived from felsic rocks. The concentration of REE in Pahang River surface sediments was controlled by the porosity and organic matter as showed by the correlation of ΣREE with porosity (R2=0.65) and organic matter content (R2=0.71). In conclusion, this research's findings are generally useful for further REE mineral exploration and fluvial sediment environmental monitoring.

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41

Sani, Rifki Asrul, Eko Soebowo, Armein M. Fikri e Imam A. Sadisun. "Karakteristik Keteknikan Sedimen Kuarter Kaitannya dengan Potensi Bahaya Geologi di Kawasan DAS Cimanuk Bagian Hilir". Jurnal Lingkungan dan Bencana Geologi 11, n. 3 (24 dicembre 2020): 161. http://dx.doi.org/10.34126/jlbg.v11i3.294.

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ABSTRAKKabupaten Indramayu yang akan dikembangkan sebagai kawasan industri didominasi oleh endapan Kuarter yang terdiri atas endapan fluvial, dataran banjir, pematang pantai, dan delta. Daerah tersebut terletak pada area dekat sesar aktif, yakni segmen sesar Baribis-Subang dengan besaran magnitudo 6,5 Mw. Penelitian di wilayah DAS Cimanuk bagian hilir Kabupaten Indramayu, Provinsi Jawa Barat bertujuan untuk mengetahui karakteristik fisik dan mekanik serta kaitannya dengan potensi bahaya geologi yang bisa terjadi. Metode yang digunakan dalam penelitian ini adalah pengamatan 4 inti bor teknik dan pola kurva sondir (10 CPTu dan 13 CPT) serta analisis laboratorium yakni ukuran butir, hydrometer, batas-batas Atterberg, dan klasifikasi sedimen. Berdasarkan pengamatan inti bor, pola kurva sondir, dan analisis laboratorium, jenis sedimen yang berkembang di daerah penelitian adalah lempung, lanau, lanau pasiran, pasir lanauan dan pasir dengan karakteristik yang spesifik. Tingkat kepadatan sedimen pasir serta tingkat konsistensi sedimen lempung bagian utara penelitian menunjukkan karakteristik yang relatif lebih lepas dan lunak dibandingkan dengan bagian selatan. Berdasarkan karakteristik keteknikan menunjukkan bahwa nilai N-SPT < 10 atau CPT/CPTu < 6.000 kPa pada sedimen pasir dan pasiran berpotensi terhadap likuefaksi dan nilai N-SPT < 4 atau CPT/CPTu < 5.000 kPa pada sedimen lempung dan lanau berpotensi terhadap amblesan. Kata kunci: bahaya geologi, Cimanuk, sedimen kuarterABSTRACTAs a future industrial area, Indramayu Regency is dominated by Quaternary sediment of fluvial, flood plain, beach ridge and deltaic sediments. The area is close to active faults, The Baribis-Subang fault segment with 6.5 Mw. This research is conducted around the lower Cimanuk catchment of Indramayu. Its aims to determine mechanical and physical characteristics related to potential geological hazards. The methods used in this research are 4 core observation, cone penetration patterns (10 CPTu and 13 CPT) and laboratory analysis such as grain size, hydrometer, Atterberg limits and sediment classification. Based on its methods, sediments that develop at the research area are clay, silt, sandy silt, silty sand and sand with specific character. Level consistency and density of clay and sand at the northern area is relatively soft and loose than the southern one. Based on engineering characteristics, the results show that NSPT < 10 or CPT/CPTu < 6,000 kPa value of sandy and sand sediment are potential against liquefaction and N-SPT < 4 or CPT/CPTu < 5,000 kPa value of silt and clay sediment are potential against subsidence. Keywords: geological hazards, Cimanuk, quarternary sediment

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42

Kumaseh, Eunike, Yuliana Varala Tatontos e Costantein Imanuel Sarapil. "Prediksi Transport Sedimen di Perairan Teluk Tahuna Kabupaten Kepulauan Sangihe". Journal of Marine Research 9, n. 3 (16 luglio 2020): 207–14. http://dx.doi.org/10.14710/jmr.v9i3.26537.

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ABSTRAK: Secara geografis, Teluk Tahuna diapit oleh 2 muara sungai yaitu Muara Sungai Tidore, yang dekat dengan Pelabuhan Nusantara Tahuna, dan Muara Sungai Towo’e. Hal ini memungkinkan terjadinya sedimentasi.Sehingga, perlu diketahui besarnya angkutan sedimen yang terjadi di perairan Teluk Tahuna.Metode penelitian yang digunakan yaitu membandingkan metode Engelund-Hansen dengan hasil pengukuran di lapangan. Pengambilan sedimen menggunakan sediment trap dan diukur selama 2 minggu sekali sebanyak 5 kali. Sedimen dibawa ke Laboratorium Mekanika Tanah untuk memperoleh ukuran diameter sedimen. Lokasi penelitian dibagi menjadi 3 stasiun, Stasiun 1 dekat muara sungai Tidore, Stasiun 2 pada bagian tengah perairan, dan Stasiun 3 dekat muara sungai Towoé. Hasil prediksi transport sedimen di Perairan Teluk Tahuna dengan metode Engelund-Hansen yaitu pada Stasiun 1 = 0,00000291(m3/m*s), Stasiun 2 = 0,00000697(m3/m*s), dan Stasiun 3 = 0,00000789(m3/m*s). Perhitungan transport sedimen yang paling tinggi adalah di Stasiun 3. Pengukuran laju sedimentasi yaitu pada Stasiun 1 sebesar 0,0000029 m3/hari, Stasiun 2 sebesar 0,0000053 m3/hari dan pada Stasiun 3 sebesar 0,0000072 m3/ hari. Rata – rata hasil pengukuran yang paling tinggi juga ada di Stasiun 3,yaitu dekat Muara Sungai Towoé. Hasil prediksi Metode Engelund-Hansen hampir sama dengan hasil pengukuran laju sedimen di lapangan. Metode Engelund-Hansen cocok digunakan untuk memprediksi transport sedimen di Perairan Teluk Tahuna. ABSTRACT: Geographically, Tahuna Bay has 2 river mouths, the Tidore river mouth, which is close to the Tahuna Harbor, and Towo'e river mouth. This allows sedimentation. So, it is necessary to know the calculation of sediment transport. The research method is comparing the Engelund-Hansen method with the results of measurements. Sediment rate measured by sediment trap and once in 2 weeks for 5 times. Sediments were taken to the Soil Mechanics Laboratory. The location was divided into 3 stations. The results of prediction of sediment transport in Tahuna Bay with the Engelund-Hansen method are Station 1 = 0,00000291 (m3/m*s), Station 2 = 0,00000697 (m3/m *s), and Station 3 = 0,00000789 (m3/m*s). The highest calculation of sediment transport is at Station 3. The average measurement of sedimentation rate at Station 1 of 0,0000029 m3/day, Station 2 of 0,0000053 m3/day and at Station 3 is 0,0000072 m3/day. The highest average measurement results are also at Station 3, which is near the Towoé River Estuary. The predicted results of the Engelund-Hansen Method are almost the same as those of the sediment rate measurements in the field. Engelund-Hansen Method can be used to predict the sediment transport in Tahuna bay.

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Vácha, R., J. Čechmánková, J. Skála, J. Hofman, P. Čermák, M. Sáňka e T. Váchová. "Use of dredged sediments on agricultural soils from viewpoint of potentially toxic substances". Plant, Soil and Environment 57, No. 8 (2 agosto 2011): 388–95. http://dx.doi.org/10.17221/105/2011-pse.

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A set of 29 pond sediments samples was collected. The sediments were separated into three groups, field, village, and forest pond sediments. The sediment samples were taken from pond bottoms and sediment heaps. The sediment characteristics (pH, CEC, Al-exchangeable, C<sub>ox</sub>, humus substances), the content of potentially toxic elements and persistent organic pollutants were analysed in the sediments and compared between sediment groups. The comparison of sediment contamination with Czech legislation for sediment use in agriculture was conducted. The village sediments were more loaded by potentially toxic elements and persistent organic pollutants than the others. The pH value of sediments was considered as the properties regulating the retention of potentially toxic elements and their mobility (Al, Cd, Zn). Polycyclic aromatic hydrocarbons (PAHs) were the most problematic POPs group in the sediments. The correlation showed poor dependency of POPs (especially PAHs) content on the content and quality of sediment organic matter.

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44

Solihuddin, Tubagus, e Gunardi Kusumah. "Sedimentary Environments of the Inshore Pemangkat Region Sambas, West Kalimantan (Lingkungan Sedimen di Perairan Pemangkat, Sambas, Kalimantan Barat)". ILMU KELAUTAN: Indonesian Journal of Marine Sciences 19, n. 1 (3 marzo 2014): 19. http://dx.doi.org/10.14710/ik.ijms.19.1.19-26.

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Peningkatan produk-produk perikanan melalui industrialisasi dengan menekankan pada pengembangan perikanan budidaya laut yang membutuhkan data pendukung lingkungan laut termasuk sediment dasar laut. Penelitian lingkungan sedimen di Perairan Pemangkat bertujuan untuk mendapatkan informasi mengenai komposisi sedimen permukaan dasar laut, konsentrasi mineral logam dan total padatan tersuspensi. Beberapa sampel sedimen permukaan telah diambil pada transek yang telah ditentukan di sekitar Pantai Pemangkat dan telah dilakukan analisis mengikuti prosedur analisis granulometri, sedangkan metode AAS diterapkan untuk menentukan konsentrasi mineral logam. Selain itu, beberapa sampel air laut juga telah diambil menggunakan botol Nansen untuk mendapatkan total padatan tersuspensi. Informasi tersebut sangat bermanfaat bagi manager dan atau pemerintah daerah dalam menilai, merencanakan dan mengelola kawasan peisir dan lingkungan laut. Standar kualitas air yang dikeluarkan oleh Kementerian Negara Lingkungan Hidup digunakan sebagai acuan untuk mengkalibrasi hasil penelitian. Studi ini menunjukkan dominasi sedimen lumpur dan tingginya konsentrasi TSS, mengindikasikan bahwa Perairan Pemangkat tidak direkomendasikan untuk pengembangan kawasan perikanan budidaya laut. Kata kunci: sedimen, mineral logam, total padatan tersuspensi Increasing fisheries products through industrialisation with emphasizing on marine aquaculture development requires supporting data on marine environments including seafloor sediments. Research on sedimentary environments of the inshore of Pemangkat region was aimed to obtain seafloor sediment composition, heavy metal and total suspended solid (TSS) concentrations. Some surface sediments samples were collected in transects across the selected Pemangkat coast and analysed following the procedure of granulometric analysis, whilst AAS (Atomic Absorption Spectroscopy) was applied to determine heavy metal concentrations (e.g. Hg, Pb, Cd, Cu, and Zn). Additionally, water samples were also collected using Nansen bottle to derive TSS concentrations. This sort of information will be valuable for manager and/or local government to assess, plan and manage coastal zone and marine environment. A standard of water quality issued by the State Ministry for Environment was then used as a reference to calibrate the results. This study showed silt (mud) sediment dominance and high TSS concentrations, indicating that the inshore Pemangkat region was not highly recommended for marine aquaculture development. Keywords: sediment, heavy metal, total suspended solid

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45

Noor, Sri Yuningsih. "Konsentrasi Logam Berat Kadmium (CD) Pada Sedimen Di Daerah Sekitar Perairan Pelabuhan Kapal Barang Talumolo Kota Gorontalo". Gorontalo Fisheries Journal 1, n. 1 (1 aprile 2008): 26. http://dx.doi.org/10.32662/.v1i1.103.

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The aim of this research was to determine the concentration cadmium (Cd) in the sediments in the area of Talumolo Cargo Ship Port, Gorontalo. The method used in this research was descriptive analysis as a mean of describing and explaining the result which has already been obtained then compare it with the quality standard set by The Department of Conservation and Natural Resources Melbourne (2004) and ant the quality standard set by Dutch Quality standars For Metals in Sedimen (IADC/CEDA, 1997). The results showed that the concentration cadmium (Cd) in the sediments in the area of Talumolo Cargo Ship Port, Gorontalo City, the highest was found at point 2 (the sediment in the harbor area) with the calculation reached 0.3229 ppm, and the second was found at the third point (sediment in the sea area) with 0.2225 ppm, while the lowest cadmium was in the first point (Bone estuary) with the number 0.2027 ppm. The concentrations of cadmium (Cd) in the sediments in the area of Talumolo Cargo Ship Port, Gorontalo still not reached the quality standard set by The Department of Conservation and Natural Resources Melbourne (2004) which was set as 1ppm, and the quality standar set up by the Dutch Quality Standars For Metals in Sediment, IADC/CEDA, (1997) which was 0.8 ppm. Keywords : Heavy metals, Cadmium, Sediment, Talumolo, Gorontalo

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46

James, William F., John W. Barko e Harry L. Eakin. "Impacts of sediment dewatering and rehydration on sediment nitrogen concentration and macrophyte growth". Canadian Journal of Fisheries and Aquatic Sciences 61, n. 4 (1 aprile 2004): 538–46. http://dx.doi.org/10.1139/f04-018.

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River sediments were experimentally dewatered via exposure to air from an initial moisture content of 75% to 61% (~20% dewatered), 32% (~60% dewatered), and 4% (~95% dewatered). Sediments dewatered by 20% and 60% and rehydrated exhibited a lower exchangeable ammonium-N (NH4-N) concentration and a lower rate of nitrate/nitrite-N and NH4-N release from sediments compared with controls. In contrast, sediments dewatered by 95% and rehydrated exhibited a marked increase in exchangeable sediment NH4-N and a much higher rate of nitrate/nitrite-N (under oxic conditions) and NH4-N (under oxic and anoxic conditions) release from sediments. Sediment dewatered by 60% and 95% and rehydrated lost total N (18%), suggesting denitrification. Growth of Potamogeton pectinatus responded to changes in the exchangeable sediment NH4-N concentration; it was lower on partially dewatered and rehydrated sediments that exhibited lower exchangeable sediment NH4-N and elevated on sediment that was dewatered by 95%. Our results suggest that sediment N may be altered via sediment dewatering and rehydration to affect macrophyte growth.

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Sri Maharani, Desak Made, Nurul Inayati e Maruni Wiwin Dinarti. "Jenis dan Jumlah Sedimen Urine Menggunakan Variasi Konsentrasi Pengawet Formalin". Quality : Jurnal Kesehatan 11, n. 2 (1 novembre 2018): 86–91. http://dx.doi.org/10.36082/qjk.v11i2.74.

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Abstract One of the laboratory tests that can be used to diagnose diseases, especially those related to kidney physiology and abnormalities of the body's metabolism, namely urinalysis. Urine sediments are insoluble elements in urine that come from blood, kidneys and urinary tract such as erythrocytes, leukocytes, epithelial cells, thorax, bacteria, crystals, fungi and parasites. Formalin which is commonly used as a urine preservative is 40% formalin, specifically used to preserve urine sediment is very important if you want to conduct a quantitative assessment of the elements in the sediment. However, the formalin in the market only has a formalin with a concentration of 37% so that the concentration of formalin preservatives needs to be lowered. The purpose of this study was to determine the effect of variations in the concentration of formaldehyde use on the amount and type of urine sediments. different for checking organic and inorganic elements. For the type of urine sediment analyzed descriptively while for the amount analyzed using the One Way Annova test. The results showed variations in the concentration of formalin preservatives 37%, 30%, 20% and 10% did not affect the type and amount of urine sediment. The conclusion of this study is that variations in the concentration of formalin preservatives do not affect the type and amount of urine sediment. Keywords : Formalin,Quantity and type, Sedimen Urine

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Febriansanu, Dicko Rizky, Angga Ahya Huseina e Andri Yadi Paembonan. "Recent Sedimentary Deposit and Dynamics Sedimentation Analysis at Teluk Betung Using GPR Interpretation and Core Data". IOP Conference Series: Earth and Environmental Science 830, n. 1 (1 settembre 2021): 012059. http://dx.doi.org/10.1088/1755-1315/830/1/012059.

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Abstract Lampung Bay is an area with a busy shipping traffic from port of Panjang and port of Teluk Betung. There are several river contain sediments and sedimented in Teluk Betung area. By conducting a research in this area, we can determine the sediment depositional system. The research method that will be used is the analysis of sediment deposition profiles from core data and interpretation from Ground Penetrating Radar (GPR). From sedimentary analysis, older sediments have a clay to coarse sand with relatively firm contact with coarsening upward patterns. In the top, they have a medium to clay with a fining upward pattern. The existence of a relatively thick clay layer indicates a relatively marginal depositional environment. These clay layers may form in the lower subtidal environment and gradually change to the upper intertidal environment until supratidal. This can be seen from the GPR result which show the sediment boundary. The GPR profiles confirm that the upper part mostly contains the sand or clay sand with sea water intrusion which has high conductivity and dielectric permittivity . The deeper zone could not well interpreted due to lack of the sediment information, but they show the contact of the sediment layers with different amplitude.

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49

Saanei, Saba, Khalil Rezaei, Mehran Arian, Seyed Mohsen Al Ali e Pantea Giahchi. "Changes in particle sizes and geochemistry of Siyah Keshim lagoon sediment of Gilan province to determine origin and tectonic position of sediment". Journal of Geology, Geography and Geoecology 29, n. 3 (11 ottobre 2020): 562–71. http://dx.doi.org/10.15421/112051.

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Useful information was obtained about the environmental condition of this region such as energy, sediment location, origin, sediment carrying path, pond evolutionary process, and tectonic conditions and origins of sediments by studying physical and geochemical sediment changes processes in place and time, distribution of sediments and elements in lagoon bed, and also identification the effective factors on sediment distribution model. In this regard, 59 sediment samples were taken from Siyah Keshim lagoon and were analyzed chemically and aggregation by XRF and ICP-MS technic. Adaptation of data by Folk diagrams showed that this region is placed in a range of sand, muddy sand, sand with a little gravel, muddy sand with a little gravel, and silty sand. Weak to medium sorting and negative tilting shows sediment in a coastal area. Geochemical evidence shows that SiO2/Al2O3 ratio in these sediments is 2.6-3.7. In addition, Na2O value shows relatively low sediment investigation for sediments of this lagoon. Moreover, determination of the weathering effect in origin place by the chemical index of alteration (CIA) and chemical weathering index (CWI) shows intensive chemical alternation on sediments. Index of combined variety was averagely 1.54 in the studied sediments and show that sediments resulted from the first cycle sediment. Using tectonic separating diagrams based on the primary and secondary oxidants percentage show the sediment in the active continent margin (ACM), continent-island arc (CIA), and oceanic island arc (OIA) and shows that the studied sediments are related to subduction margin.

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Gyulai, István, János Korponai, Sheila Mumbi A. Wamugi, Jázmin Jakab, Umar Abba Kawu, Andor G. Soltész, Tamás Karches e Uyanga Tumurtogoo. "Cladocera and Geochemical Variables from Core Sediments Show Different Conditions of Hungarian Lakes". Water 16, n. 9 (5 maggio 2024): 1310. http://dx.doi.org/10.3390/w16091310.

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Studies on the sediments of lakes with varying trophic status are of particular importance when considering changes in the natural environment. In this study, our objective was to examine subfossil remains of Cladocera species and the relationship between the sedimental Cladocera assemblages and geochemical variables during 11 years of sediment records from northern Hungarian lakes. To achieve this, we compared sedimental cladoceran communities and the geochemistry of the sediment layers among lakes. Among the studied lakes, one was an intermittent lake (KMT: the Kis-Morotva Lake) which dried out in 2012 but was subsequently naturally refilled in 2013 by groundwater affected by the high-water level of the River Tisza. The other type consisted of permanent lakes (SZA: the Szabolcs oxbow lake, TI: the Timár Morotva Lake) that never dried out. The results of the beta diversity analysis show that the deposition of Cladocera communities was similar among the sediment layers of lakes, while the abundance differences contributed significantly to replacement. Subsequently, core sediment samples of the three lakes were compared based on the remains of Cladocera communities and geochemical variables using Adonis (PERMANOVA). The core sediment samples indicate variations in Cladocera communities alongside disparities in geochemical variables across the same lakes. In conclusion, the significance of sediment cores containing the remains of the Cladocera community has grown significantly in the reconstruction of historical ecological and climatic changes.

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