Bibliografie tematiche / Surface sediment

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Letteratura scientifica selezionata sul tema "Surface sediment"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Surface sediment"

1

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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2

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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Abstract (sommario):
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 Φ - 3 Φ). 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 Φ - 2 Φ). 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 (Φ 2 - Φ 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 (Φ1 - Φ2). 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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3

Rosa, Kátia Kellem da, Rosemary Vieira e Jefferson Cardia Simões. "Identificação de Mudanças Ambientais Através da Caracterização Sedimentar e Investigação de Processos Glaciogênicos e Paraglaciais no Ambiente Glacial da Geleira Wanda, Ilha Rei George, Antártica (Identification of Environmental Change Through...)". Revista Brasileira de Geografia Física 6, n. 1 (17 luglio 2013): 029. http://dx.doi.org/10.26848/rbgf.v6i1.232807.

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Abstract (sommario):
Este estudo objetiva identificar as características sedimentares associadas aos depósitos glaciogênicos e sedimentos com modificação por processos não glaciais na área proglacial da geleira Wanda, Ilha Rei George, Antártica. A metodologia foi desenvolvida através de atividades de campo realizadas durante a estação de verão em 2007, 2010 e 2011. Os sedimentos foram analisados para determinar a distribuição granulométrica e características morfoscópicas. Este estudo apresenta resultados de interpretações dos sedimentos coletados na proglacial da geleira Wanda. A análise sedimentar possibilita a distinção de sedimentos glaciogênicos e dos sedimentos modificados por atividade paraglacial, podendo evidenciar mudanças ambientais em decorrência do aumento da temperatura atmosférica superficial e da precipitação líquida. AbstractThis study arms identify sediment characteristics related to glaciogenics deposits and modification with paraglacial processes in Wanda Glacier proglacial area, King George Island, Antarctica. The methodology was developed through field activities performed during summers in 2007, 2010 and 2011. The sediments were analyzed to determine the particle size distribution and morphoscopical characteristics. This study presents results of the samples sediment interpretation in Wanda Glacier proglacial area. The sediment analyses provided the discrimination of the glaciogenicssediments and paraglacial modified sediments, and was evidence for environment changes in the study area due to the increase surface atmospheric temperature and liquid precipitation.
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4

Inamdar, Shreeram, Nathan Sienkiewicz, Alyssa Lutgen, Grant Jiang e Jinjun Kan. "Streambank Legacy Sediments in Surface Waters: Phosphorus Sources or Sinks?" Soil Systems 4, n. 2 (11 maggio 2020): 30. http://dx.doi.org/10.3390/soilsystems4020030.

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Abstract (sommario):
Streambank legacy sediments can contribute substantial amounts of sediments to Mid-Atlantic waterways. However, there is uncertainty about the sediment-bound P inputs and the fate of legacy sediment P in surface waters. We compared legacy sediment P concentrations against other streambank sediments and upland soils and evaluated a variety of P indices to determine if legacy sediments are a source or sink of P to surface waters. Legacy sediments were collected from 15 streambanks in the mid-Atlantic USA. Total P and M3P concentrations and % degree of phosphorus saturation (DPS) values for legacy sediments were lower than those for upland soils. % DPS values for legacy sediments were below the water quality threshold for P leaching. Phosphorus sorption index (PSI) values for legacy sediments indicated a large capacity for P sorption. On the other hand, equilibrium phosphorus concentration (EPC0) for legacy sediments suggested that they could be a source or a sink depending on stream water P concentrations. Anoxic conditions resulted in a greater release of P from legacy sediments compared to oxic conditions. These results suggest that legacy sediment P behavior could be highly variable and watershed models will need to account for this variability to reliably quantify the source-sink behavior of legacy sediments in surface waters.
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5

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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Abstract (sommario):
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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6

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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Abstract (sommario):
Semburan lumpur Sidoarjo (Lusi) di daerah Porong menambah fungsi Sungai Porong menjadi sarana untuk mengalirkan lumpur ke arah laut, karena kemampuan tanggul – 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 – 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 (halus– 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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Owens, Edward H., Gary A. Sergy e John Harper. "THE BEHAVIOUR AND TREATMENT OF ORIMULSION® BITUMEN STRANDED ON PEBBLE, COBBLE OR IMPERMEABLE SUBSTRATE SHORELINES". International Oil Spill Conference Proceedings 2005, n. 1 (1 maggio 2005): 919–24. http://dx.doi.org/10.7901/2169-3358-2005-1-919.

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Abstract (sommario):
ABSTRACT Bitumen from an Orimulsion® spill can strand on shorelines in the form or dispersed bitumen or coalesced bitumen. Wetness of the shoreline substrate is an important factor in the adhesion of the bitumen and this in turn significantly effects selection of a treatment technique. Stranded bitumen on the surface of a shoreline that remains wet and/or non adhesive can be removed relatively easily by a combination of low-pressure washing, flooding, and recovery, or by manual and mechanical removal techniques. When stranded on dry surfaces or when interfacial surfaces dry, then the bitumen will strongly adhere to shoreline substrates either in the form of thin coatings or thick deposits of bitumen that are difficult to remove. Heated, high-pressure seawater washing is effective but must be accompanied by flooding to minimize penetration into coarse sediments. Sediment relocation, sediment removal, wet tilling and natural recovery techniques are appropriate techniques under specific oiling conditions. Temperature greatly effects bitumen penetration into sediments. Where bitumen coatings or deposits form in subsurface sediments then treatment becomes extremely difficult, requiring sediment removal or techniques to bring oiling surface sediments to the surface for treatment.
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Junakova, N., J. Junak e M. Balintova. "The effect of physicochemical properties of bottom sediments on nitrogen and phosphorus sorption". IOP Conference Series: Materials Science and Engineering 1252, n. 1 (1 settembre 2022): 012059. http://dx.doi.org/10.1088/1757-899x/1252/1/012059.

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Abstract (sommario):
Abstract River and reservoir bottom sediments are characterized by their physical and chemical properties, which affect the quality of water and deposited sediments in reservoirs. The grain composition of sediments is their fundamental property that determines the detachment, transport and sedimentation of sediments. In addition to understanding the dynamics of transport and distribution of particles in the watershed, the granularity is closely related to the mineral and chemical composition of the sediment and plays an important role in terms of its ability to bind contaminants. Other important property of sediment includes the specific surface area, which determines the nature of sediment surface reactions and influences ecosystem level, biological processes. This study investigates sediment properties, including physical properties such as grain-size distribution, specific surface area, organic matter and chemical composition, and their reflections on nitrogen and phosphorus adsorption by the sediments deposited in the small water reservoir. The results clearly indicate the dependence of the content of nutrients (nitrogen and phosphorus) in reservoir sediments on their grain size and specific surface area.
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Moreton, Steven G., Gunhild C. Rosqvist, Sarah J. Davies e Michael J. Bentley. "Radiocarbon Reservoir Ages from Freshwater Lakes, South Georgia, Sub-Antarctic: Modern Analogues from Particulate Organic Matter and Surface Sediments". Radiocarbon 46, n. 2 (2004): 621–26. http://dx.doi.org/10.1017/s0033822200035669.

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Abstract (sommario):
Lake sediments have the potential to preserve proxy records of past climate change. Organic material suitable for radiocarbon dating often provides age control of such proxy records. Six shallow freshwater lakes on the sub-Antarctic island of South Georgia were investigated for carbon reservoir effects that may influence age-depth profiles from lake sediment records in this important region. Paired samples of particulate organic matter (POM) from the water column and surface sediment (bulk organic carbon) were analyzed by accelerator mass spectrometry 14C. POM in 4 lakes was found to be in equilibrium with the atmosphere (~107% modern), whereas 2 lakes showed significant depletion of 14C. In each lake, the surface sediment ages were older than the paired POM age. Surface sediment ages showed a much greater range of ages compared to the equivalent POM ages, even for lakes located in close proximity. We conclude that sediment disturbance during coring, bioturbation, and periodic resuspension of sediments are likely factors causing the difference in the apparent age of surface sediments.
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Spencer, K. L., e C. L. MacLeod. "Distribution and partitioning of heavy metals in estuarine sediment cores and implications for the use of sediment quality standards". Hydrology and Earth System Sciences 6, n. 6 (31 dicembre 2002): 989–98. http://dx.doi.org/10.5194/hess-6-989-2002.

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Abstract (sommario):
Abstract. Total metal concentrations in surface sediments and historically contaminated sediments were determined in sediment cores collected from three estuaries (Thames, Medway and Blackwater) in south-east England. The partitioning behaviour of metals in these sediments was also determined using a sequential extraction scheme. These data were then compared with sediment quality values (SQVs) to determine the potential ecotoxicological risk to sediment dwelling organisms. When total metal concentrations in surface sediments are examined, no risk to biota in any of the estuaries is indicated. However, when historically contaminated sediments at depth are also considered, risks to biota are apparent and are greatest for the Thames, followed by the Medway and then the Blackwater. This suggests that regulatory authorities should examine vertical metal profiles, particularly in estuaries that are experiencing low sediment accumulation rates where historically contaminated sediments are in the shallow sub-surface zone and where erosion or dredging activities may take place. When metal partitioning characteristics are also considered, the risk to biota is comparable for the Medway and the Blackwater with the potentially bioavailable fraction presenting no ecotoxicological risk. Conversely, over 70% of metals are labile in the Thames Estuary sediments and toxic effects are probable. This suggests that the application of SQVs using total sediment metal concentrations may over- or under-estimate the risk to biota in geochemically dissimilar estuarine sediments. Keywords: sediment quality values, estuarine sediments, metal contamination, partitioning, sequential extraction
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Più fonti

Tesi sul tema "Surface sediment"

1

Wolcott, John Fredric. "Flume studies of gravel bed surface response to flowing water". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/31033.

Testo completo
Abstract (sommario):
Almost all sediment transport equations incorporate the Shields parameter, which is a ratio of the total boundary shear stress as a driving force and the particle weight as a resisting force. Shields (1936) equated particle resistance to entrainment with particle weight, which is proportional to particle diameter, or bed texture. The present work analyses the particle resistance term in the Shields parameter. As the bed material adjusts to a given flow condition, bed stability increases. The arrangement of particles into more stable configurations is here termed geometric structure, and includes the formation of pebble clusters, and imbrication. After an initial surface coarsening, here termed textural structure, particle resistance to movement is a function primarily of geometric structure. The Shields number for entrainment is thus a measure of particle resistance due to both types of bed structure rather than the conventional notion of particle resistance due to particle weight. The response of a mobile bed surface composed of < 8 mm diameter gravels to flowing water was explored in a 6 meter by 0.5 meter flume using four different slopes and various water depths. Corrected bed shear stresses varied between 0.05 and 2.79 Pa. Step increases in discharge with a constant slope caused the bed surface to develop a structure which was more stable at the end of a run than at the beginning. Under these conditions, the Shields number for incipient motion was found to vary between 0.001 and 0.066. This variability can be explained by the degree of geometric structure present. Previous studies, including Shields' work (1936), have implicitly included the effects of geometric structure on incipient motion. Surface coarsening develops with very low flows, but subsequent coarsening in higher flows is minor, with less than 5% increase in median diameter following a 50% increase in bed shear stress. Calculations of Manning's n based on depth, slope, and velocity measurements show an increase in flow resistance as structure develops. The development of a coarse surface layer appears to be limited by flow characteristics near the bed which are in turn modified by the development of structure. Measurements of the area occupied by the largest stones show that they do not cover more than 14% of the surface during maximum coarsening. Froude scaling of the flume data indicates that the time necessary for development of maximum strength is on the order of a month for natural rivers under steady flow conditions. This suggests that gravel river beds are rarely in equilibrium with natural flow conditions.
Arts, Faculty of
Geography, Department of
Graduate
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2

Nyander, Annie. "River bed sediment surface characterisation using wavelet transform-based methods". Thesis, Edinburgh Napier University, 2004. http://researchrepository.napier.ac.uk/Output/5885.

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Abstract (sommario):
The primary purpose of this work was to study the morphological change of river-bed sediment surfaces over time using wavelet transform analysis techniques. The wavelet transform is a rapidly developing area of applied mathematics in both science and engineering. As it allows for interrogation of the spectral made up of local signal features, it has superior performance compared to the traditionally used Fourier transform which provides only signal averaged spectral information. The main study of this thesis includes the analysis of both synthetically generated sediment surfaces and laboratory experimental sediment bed-surface data. This was undertaken using two-dimensional wavelet transform techniques based on both the discrete and the stationary wavelet transforms. A comprehensive data-base of surface scans from experimental river-bed sediment surfaces topographies were included in the study. A novel wavelet-based characterisation measure - the form size distribution ifsd) - was developed to quantify the global characteristics of the sediment data. The fsd is based on the distribution of wavelet-based scale-dependent energies. It is argued that this measure will potentially be more useful than the traditionally used particle size distribution (psd), as it is the morphology of the surface rather than the individual particle sizes that affects the near bed flow regime and hence bed friction characteristics. Amplitude and scale dependent thresholding techniques were then studied. It was found that these thresholding techniques could be used to: (1) extract the overall surface structure, and (2) enhance dominant grains and formations of dominant grains within the surfaces. It is shown that assessment of the surface data-sets post-thresholding may allow for the detection of structural changes over time.
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3

Stromback, Anna Christina. "A sub-surface evaluation of the Weissliegend facies, UK, southern North Sea". Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250239.

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4

Jönsson, Anette. "Model studies of surface waves and sediment resuspension in the Baltic Sea /". Linköping : Faculty of Arts and Science, Linköping University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4680.

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5

Jönsson, Anette. "Model Studies of Surface Waves and Sediment Resuspension in the Baltic Sea". Doctoral thesis, Linköpings universitet, Tema vatten i natur och samhälle, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4680.

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Abstract (sommario):
Wave heights and periods of surface waves in the Baltic Sea have been modelled for a two-year period (1999-2000) with the wave model Hypas on an 11x11-km grid scale. There is a clear seasonal variation with higher waves during winter and lower during summer. This is mainly a reflection of the wind climate in the area where the winters are windier than the summers. The largest waves are found in the Skagerrak and over the deeper, eastern areas in the Baltic Proper. In the Baltic Sea, the surface waves influence the bottom sediment by initiating resuspension down to 80 m depths. This process is dependent not only on the waves but also on the varying grain size diameters. Fine and medium sand resuspend more often than other sediment types, and these sediments cover together about 25% of the Baltic Proper area. On average sediment is here resuspended 4-5 times per month with a duration for each event of 22 hours. The highest resuspension frequencies are found on the eastern and southern side of the Baltic Proper. During resuspension sediment grains are lifted up into the water mass and matters earlier bound in the sediment can be released. This may stimulate both production and degradation of organic matter.
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He, Zhiguo. "Numerical simulation of flow, sediment, and contaminant transport in integrated surface-subsurface systems /". Full text available from ProQuest UM Digital Dissertations, 2007. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1414125241&SrchMode=1&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1221163101&clientId=22256.

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7

Solaimani, Karim. "Estimating changes in morphology and sediment supply using remote sensing and field techniques in the Lar Dam Basin, Iran". Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321067.

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Beasley, Jeffrey S. "Nitrogen Regime Influence on Nutrient and Sediment Surface Runoff During Vegetative Establishment of Bermudagrass". Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31900.

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Bermudagrass (Cynodon dactylon (L.) Pers.) is a popular turfgrass used throughout the Southeast. Bermudagrass is established primarily as sprigs on large acreage sites. Currently, the industry standard practice (ISP) of fertilization during bermudagrass sprig establishment is 48.8 kg N ha-1 wk-1. This fertilizer rate can be excessive on morphologically immature sprigs in the initial weeks of establishment, thus making the possibility of offsite surface runoff N events more likely. Two experiments were conducted in 2000 and 2001 where sprigs were established at 2, 4, 6, 8, and 10 weeks prior to applying simulated rainfall (WPRS) following N fertilization rates of the ISP or a lower initial N (LIN) rate of 12.2 kg N ha-1 wk-1 the first four weeks and then 48.8 kg N ha-1 wk-1 until full establishment. At the tenth week all treatments were subjected to rainfall simulation at 63.5 mm hr-1. Once surface runoff was induced, rainfall continued for thirty minutes during which time runoff samples were taken every five minutes and analyzed for sediment losses, N concentrations in the nitrate and ammonium forms, and phosphorus losses as dissolved reactive P (DRP). Experimental results indicate an ability to curb N losses through surface runoff during the initial weeks of sprig establishment following the LIN with only modest delays in sprig establishment. Sprigs established for the same time period, under the ISP or LIN, were very similar in growth, release of surface runoff, and sediment losses during runoff events.
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9

Steenhauer, Kate. "An experimental and numerical study of surface-subsurface interaction for bore-driven swash on coarse-grained beaches". Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources. Restricted: no access until Nov. 24, 2011, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=59381.

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Ståhlberg, Carina. "Mineralisation rates of natural organic matter in surface sediments affected by physical forces : a study of fresh- and brackish-water sediments subjected to changed redox conditions, resuspension, and advective pore water flow /". Linköping : Department of Water and Environmental Studies, [The Tema Institute], Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8332.

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Libri sul tema "Surface sediment"

1

Wells, Wade G. Sediment traps for measuring onslope surface sediment movement. Berkeley, Calif: U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, 1987.

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2

Wells, Wade G. Sediment traps for measuring onslope surface sediment movement. Berkeley, Calif: U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, 1987.

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Wells, Wade G. Sediment traps for measuring onslope surface sediment movement. Berkeley, Calif: U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, 1987.

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4

Lick, Wilbert J. Sediment and contaminant transport in surface waters. Boca Raton: Taylor & Francis, 2009.

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5

Poe, M. L. Are surface coal mine sediment ponds working? S.l: s.n, 1985.

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6

Turkey. Elektrik İşleri Etüt İdaresi Genel Müdürlüğü. Türkiye akarsularında sediment gözlemleri ve sediment taşınım miktarları =: Sediment data and sediment transport amount for surface waters in Turkey. [Ankara]: Elektrik İşleri Etüt İdaresi Genel Müdürlüğü, 1987.

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Ward, Janice R. Surface-water quality in Pequea Creek basin, Pennsylvania, 1977-79. Harrisburg, Pa: U.S. Dept. of the Interior, Geological Survey, 1987.

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Ward, Janice R. Surface-water quality in Pequea Creek basin, Pennsylvania, 1977-79. Harrisburg, Pa: U.S. Dept. of the Interior, Geological Survey, 1987.

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Ward, Janice R. Surface-water quality in Pequea Creek basin, Pennsylvania, 1977-79. Harrisburg, Pa: U.S. Dept. of the Interior, Geological Survey, 1987.

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Ward, Janice R. Surface-water quality in Pequea Creek basin, Pennsylvania, 1977-79. Harrisburg, Pa: U.S. Dept. of the Interior, Geological Survey, 1987.

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Capitoli di libri sul tema "Surface sediment"

1

Pikelj, Kristina, e Nina Furčić. "Impact of cliff erosion on marine sediment composition - indication of local coastline evolution (Vrgada Island, Croatia)". In Proceedings e report, 462–68. Florence: Firenze University Press, 2020. http://dx.doi.org/10.36253/978-88-5518-147-1.46.

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Erosive coastal cliffs formed in soft-rocks sediments along the generally carbonaceous Eastern Adriatic are a rare feature. The one from the Vrgada Island gave rise to the idea that local seabed surface sediment may reflect the composition of the cliff sediment. First results of sedimentological analyses showed that sediment samples collected on both sides of the cliff contain material eroded mostly from the eastern side of the cliff. Subsequent longshore drift caused by dominant waves likely sort fallen material, transporting its finer fractions to the northern side and further into the sea.
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Suhayda, Joseph N. "Interaction Between Surface Waves and Muddy Bottom Sediments". In Estuarine Cohesive Sediment Dynamics, 401–28. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4936-8_18.

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Suhayda, Joseph N. "Interaction Between Surface Waves and Muddy Bottom Sediments". In Estuarine Cohesive Sediment Dynamics, 401–28. New York Inc.: Springer-Verlag, 2013. http://dx.doi.org/10.1029/ln014p0401.

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4

Holzbecher, Ekkehard, e Ahmed Hadidi. "Sediment Transport in Shallow Waters as a Multiphysics Approach". In Natural Disaster Science and Mitigation Engineering: DPRI reports, 423–37. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2904-4_16.

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AbstractSuspended particle and bed-load transport are usually high during flooding events. For that reason, sediment transport is an important feature to be taken into account when studying floods. Measures that aim to mitigate the negative impacts of floods depend on such studies. Sediment transport phenomena are complex due to their coupling behavior with fluid flow. Due to the erosion and sedimentation of particulate matter, the ground surface changes during the passing of a flood. The courses of unregulated rivers and wadis after floods are different than those before floods. Flowing water transports sediments, and vice versa; sediment redistribution affects the flow of water due to changes in the ground surface and other factors. Computer simulations of sediment transport must take the coupling between water flow and transport processes into account. Here, a multiphysics approach in such a coupled model is presented. Shallow water equations (SWE) representing water height and velocity are coupled with equations for suspended particulate matter and bed loads. Using COMSOL Multiphysics software, an implementation is presented that demonstrates the capability and feasibility of the proposed approach. The approach is applied to the problems of scouring and sedimentation at obstacles, which are particularly important for ensuring the stability of bridges across rivers and wadis.
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Jensen, H. S., P. Kristensen, E. Jeppesen e A. Skytthe. "Iron:phosphorus ratio in surface sediment as an indicator of phosphate release from aerobic sediments in shallow lakes". In Sediment/Water Interactions, 731–43. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2783-7_66.

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6

Wells, John T., e G. Paul Kemp. "Interaction of Surface Waves and Cohesive Sediments: Field Observations and Geologic Significance". In Estuarine Cohesive Sediment Dynamics, 43–65. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4936-8_3.

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7

Wells, John T., e G. Paul Kemp. "Interaction of Surface Waves and Cohesive Sediments: Field Observations and Geologic Significance". In Estuarine Cohesive Sediment Dynamics, 43–65. New York Inc.: Springer-Verlag, 2013. http://dx.doi.org/10.1029/ln014p0043.

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8

Fang, Hongwei, Lei Huang, Huiming Zhao, Wei Cheng, Yishan Chen, Mehdi Fazeli e Qianqian Shang. "Surface Micro-morphology and Adsorption Properties of Sediment Particles". In Mechanics of Bio-Sediment Transport, 1–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61158-6_1.

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9

Huttunen, Pertti, e Jaana Turkia. "Surface Sediment Diatom Assemblages and Lake Acidity". In Acidification in Finland, 995–1008. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75450-0_50.

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Onishi, Yasuo. "Sediment Transport Models and their Testing". In Computer Modeling of Free-Surface and Pressurized Flows, 281–312. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0964-2_10.

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Atti di convegni sul tema "Surface sediment"

1

Derugina, N., N. Derugina, А. Grigoriev, A. Grigoriev, Дарья Рябчук, Daria Ryabchuk, A. Rybalko, A. Rybalko, V. Zhamoida e V. Zhamoida. "PROBLEM OF HEAVY METAL SURFACE SEDIMENT CONTAMINATION IN THE EASTERN GULF OF FINLAND". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b947d5007e5.47030428.

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This project defines the pre-industrial quantities of heavy metals in sediment sequences of the Late Holocene from the Eastern Gulf of Finland. A comparative analysis reveals differences and similarities in the current concentrations of heavy metals in bottom sediments and pre-industrial levels. It is found that the maximum concentrations of heavy metals in the bottom sediments of the Gulf of Finland and Neva Bay occurred in the period of 1950-1990. Since the 1990s, the trend has been a slow decline in the contamination levels; however, the concentrations of some heavy metals in bottom sediments remain high.
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2

Derugina, N., N. Derugina, А. Grigoriev, A. Grigoriev, Дарья Рябчук, Daria Ryabchuk, A. Rybalko, A. Rybalko, V. Zhamoida e V. Zhamoida. "PROBLEM OF HEAVY METAL SURFACE SEDIMENT CONTAMINATION IN THE EASTERN GULF OF FINLAND". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4316eb2e6d.

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Abstract (sommario):
This project defines the pre-industrial quantities of heavy metals in sediment sequences of the Late Holocene from the Eastern Gulf of Finland. A comparative analysis reveals differences and similarities in the current concentrations of heavy metals in bottom sediments and pre-industrial levels. It is found that the maximum concentrations of heavy metals in the bottom sediments of the Gulf of Finland and Neva Bay occurred in the period of 1950-1990. Since the 1990s, the trend has been a slow decline in the contamination levels; however, the concentrations of some heavy metals in bottom sediments remain high.
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3

Low, Han Eng, Mark Felton Randolph, Cassandra Rutherford, Bernie B. Bernard e James M. Brooks. "Characterization of Near Seabed Surface Sediment". In Offshore Technology Conference. Offshore Technology Conference, 2008. http://dx.doi.org/10.4043/19149-ms.

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4

Qian, Jin-yuan, Min-rui Chen, Zhi-xin Gao e Zhi-jiang Jin. "Fouling Analysis on Energy Dissipation Orifice Plates With Sediment Contained Water Flow". In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83159.

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Hydropower stations play an important role in discharging the flood. Especially in wet seasons, the river water always contains several percentages of sediment, and the velocity of the water flowing through the flood discharging tunnel is very high. Arranging some energy dissipation orifice plates in the flood discharging tunnel, cannot only reduce the pressure and flow velocity, but also deposit sediment and reduce the sediment content. However, fouling on energy dissipation orifice plates can initiate material corrosion of perforated plates, even weaken the energy dissipation performance. In this paper, the fouling performance on energy dissipation orifice plates with sediment contained water flow is investigated. To begin with, the pressure along the path is used to compare with a reported experiment to verify the reliability of the numerical method. Then, effects of the solid particle diameter, the sediment volume concentration and the inlet flow velocity on the particle distribution are observed. The results show that with the increase of the Reynolds number, the sediment volume fraction and the sediment particle diameter, more sediments accumulate at both surfaces of the orifice plate. The Reynolds number and the sediment volume fraction affect the upstream surface more significantly, while the effect of sediment particle diameter is more notable on the downstream surface. Additionally, the energy dissipation coefficient of the orifice plate is mainly dominated by the Reynolds number. This work is of significance for further analysis of fouling problems in energy dissipation orifice plates or similar fluid machinery.
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Osadchiev, Alexander, Alexander Osadchiev, Peter Zavialov, Peter Zavialov, Vadim Pelevin e Vadim Pelevin. "METHOD FOR QUANTIFYING ADVECTION, TURBULENT MIXING, AND GRAVITATIONAL SETTLING OF RIVER-BORNE SUSPENDED SEDIMENTS IN COASTAL AREAS FROM THERMOHALINE AND OPTICAL MEASUREMENTS". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b94a309e5c6.22106638.

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This work presents an original method for quantifying advection and turbulent mixing of river-borne suspended sediments. The main idea of the method consists in joint analysis of surface distributions of salinity and sediment concentration in coastal areas influenced by river discharge. Basing on the Lagrangian approach we represent a river plume as a set of individual water particles, which inflow from a river mouth, mix with ambient sea water during their motion within a river plume and finally dissipate. Surface salinity and sediment concentration of a particle provides information about its turbulent mixing with undelaying ambient sea waters and gravitational settling of its sediments respectively during the period from its origin in the river estuary till the moment of measurement. Using these integrated Lagrangian characteristics calculated for the whole study area we reconstruct advection streamlines within the river plume and ratio between turbulent mixing and gravitational settling of river-borne suspended sediments. This method was applied to coastal areas situated in the north-eastern part of the Black Sea and the western part of the Philippine Sea. High resolution thermohaline and sediment concentration data were collected using a pump-through system equipped by a CTD instrument and a turbidity sensor.
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Osadchiev, Alexander, Alexander Osadchiev, Peter Zavialov, Peter Zavialov, Vadim Pelevin e Vadim Pelevin. "METHOD FOR QUANTIFYING ADVECTION, TURBULENT MIXING, AND GRAVITATIONAL SETTLING OF RIVER-BORNE SUSPENDED SEDIMENTS IN COASTAL AREAS FROM THERMOHALINE AND OPTICAL MEASUREMENTS". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b431548658b.

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This work presents an original method for quantifying advection and turbulent mixing of river-borne suspended sediments. The main idea of the method consists in joint analysis of surface distributions of salinity and sediment concentration in coastal areas influenced by river discharge. Basing on the Lagrangian approach we represent a river plume as a set of individual water particles, which inflow from a river mouth, mix with ambient sea water during their motion within a river plume and finally dissipate. Surface salinity and sediment concentration of a particle provides information about its turbulent mixing with undelaying ambient sea waters and gravitational settling of its sediments respectively during the period from its origin in the river estuary till the moment of measurement. Using these integrated Lagrangian characteristics calculated for the whole study area we reconstruct advection streamlines within the river plume and ratio between turbulent mixing and gravitational settling of river-borne suspended sediments. This method was applied to coastal areas situated in the north-eastern part of the Black Sea and the western part of the Philippine Sea. High resolution thermohaline and sediment concentration data were collected using a pump-through system equipped by a CTD instrument and a turbidity sensor.
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Parr, Alfred D. "A Laboratory Study of Sediment Transport in Free Surface Flow". In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77336.

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This paper discusses an undergraduate fluid mechanics laboratory session. The lab allows the students to observe various sediment transport phenomena in a hands-on manner. The experiments are performed in a glass-walled, tilting sediment flume. The following sediment transport phenomena are created and observed by the students — bed load, suspended load, bed forms (ripples, dunes, antidunes...), surface waves over various bed forms and local scour at flow obstructions including bridge piers and abutments. Students are able to observe local scour using PVC pipes for bridge piers and dimension lumber for abutment scour. Since the flume is 12.2-m long, a large group of students can spread out along both sides of the flume to observe bed forms and to perform local scour tests.
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Sedlacek, Stephan, Friedwart Ziemer e Marius Cysewski. "Sediment modeling based on radar observed surface hydrodynamics". In OCEANS 2009-EUROPE (OCEANS). IEEE, 2009. http://dx.doi.org/10.1109/oceanse.2009.5278202.

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Prakash, Anand. "Evaluation of Sediment Stability in Surface Water Bodies". In World Water and Environmental Resources Congress 2003. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40685(2003)10.

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Sedlacek, Stephan, Friedwart Ziemer e Marius Cysewski. "Sediment Modeling based on Radar Observed Surface Hydrodynamics". In IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2008. http://dx.doi.org/10.1109/igarss.2008.4779658.

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Rapporti di organizzazioni sul tema "Surface sediment"

1

Wells, Wade G., e Peter M. Wohlgemuth. Sediment traps for measuring onslope surface sediment movement. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, 1987. http://dx.doi.org/10.2737/psw-rn-393.

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Swift, Stephen A. Construction of Surface Sediment Data Bases, Seafloor Sediment Studies in the Middle East. Fort Belvoir, VA: Defense Technical Information Center, settembre 1999. http://dx.doi.org/10.21236/ada367859.

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3

Noshkin, V. E., R. J. Eagle, K. M. Wong e W. L. Robison. Sediment studies at Bikini Atoll part 2. inventories of transuranium elements in surface sediments. Office of Scientific and Technical Information (OSTI), ottobre 1997. http://dx.doi.org/10.2172/646365.

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4

Friday, G. P. Ecological Screening Values for Surface Water, Sediment, and Soil. Office of Scientific and Technical Information (OSTI), marzo 1999. http://dx.doi.org/10.2172/4764.

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Noshkin, V. E., R. J. Eagle e W. L. Robison. Sediment studies at Bikini Atoll part 1. distribution of fine and coarse components in surface sediments. Office of Scientific and Technical Information (OSTI), gennaio 1997. http://dx.doi.org/10.2172/574548.

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Friday, G. P. Ecological Screening Values for Surface Water, Sediment, and Soil: 2005 Update. Office of Scientific and Technical Information (OSTI), luglio 2005. http://dx.doi.org/10.2172/881510.

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Noshkin, V. E. Sediment studies at Bikini Atoll part 3. Inventories of some long-lived gamma-emitting radionuclides associated with lagoon surface sediments. Office of Scientific and Technical Information (OSTI), dicembre 1997. http://dx.doi.org/10.2172/16634.

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Main, P. T., e D. C. Champion. Levelled surface sediment geochemistry data for the North Australian Craton: data release 1. Geoscience Australia, 2020. http://dx.doi.org/10.11636/record.2020.017.

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9

Haan, M. M., J. R. Russell, Wendy J. Powers, J. L. Kovar, J. L. Boehm, Steven K. Mickelson e R. Schultz. Impacts of Cattle Grazing Management on Sediment and Phosphorus Loads in Surface Waters. Ames (Iowa): Iowa State University, gennaio 2005. http://dx.doi.org/10.31274/ans_air-180814-1379.

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Haan, Matthew M., James R. Russell, Steven K. Mickelson, Richard Schultz e John L. Kovar. Impacts of Cattle Grazing Management on Sediment and Phosphorus Loads in Surface Waters. Ames (Iowa): Iowa State University, gennaio 2004. http://dx.doi.org/10.31274/ans_air-180814-736.

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