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Relevant bibliographies by topics / Estuary

Academic literature on the topic 'Estuary'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 August 2024

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Journal articles on the topic "Estuary"

1

Rustomji, Paul. "Flood and drought impacts on the opening regime of a wave-dominated estuary." Marine and Freshwater Research 58, no. 12 (2007): 1108. http://dx.doi.org/10.1071/mf07079.

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Wave-dominated estuaries are affected by floods generated in their hinterland catchments as well as marine tide and wave processes. The interaction of these terrestrial and marine influences controls the opening regime of the estuary. Despite the well documented environmental pressures on estuaries including elevated nutrient loadings and abstraction of river flows, little research concerning the variability and controls on estuary mouth opening regimes exists. From water level observations of Tuross Lake estuary in south-eastern Australia, the estuary’s recent opening regime is reconstructed and shown to vary significantly over time. Floodwaters fill the estuary and scour the estuary mouth, enhancing the exchange of marine water between the estuary and the ocean, which manifests as an increased tidal range within the estuary. Between floods, tide and wave activity caused aggradation of the estuary mouth such that the tidal range within the estuary declined by 0.5–0.7 mm per day as the mouth became more constricted. Under conditions of low river flow, high evaporative losses and seasonal reductions in ocean wave height, the estuary mouth can close completely. Using twentieth century streamflow estimates, it is shown that hydrologic variability is likely to have resulted in large variations in the estuary’s opening regime. Since 2000, there have been relatively few flood-driven scour events and this explains the relatively congested state of the current estuary mouth. Predicted hydrologic changes under enhanced atmospheric carbon dioxide concentrations are also likely to enhance the variability in the estuary’s opening regime.

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Rais, Aroef Hukmanan, Rupawan Rupawan, and Herlan Herlan. "HUBUNGAN KEPADATAN IKAN DENGAN KONDISI LINGKUNGAN PERAIRAN ESTUARI DI KABUPATEN BANYUASIN." Jurnal Penelitian Perikanan Indonesia 23, no. 2 (November 14, 2017): 111. http://dx.doi.org/10.15578/jppi.23.2.2017.111-122.

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Estuari di wilayah Kabupaten Banyuasin dengan potensi biodiversitas sumber daya ikan yang tinggi, merupakan wilayah penangkapan yang potensial dan berkontribusi besar terhadap poduksi perikanan Provinsi Sumatera Selatan. Distribusi biomassa sumber daya ikan di wilayah estuari sangat dinamis dan dipengaruhi oleh parameter salinitas dan suhu perairan pada suatu lingkungan perairan. Penelitian ini bertujuan untuk mengetahui kondisi kepadatan biomassa ikan dalam hubungannya dengan kondisi lingkungan perairan di wilayah perairan estuari Kabupaten Banyuasin.Pengambilan sampel ikan dilakukan dengan percobaan penangkapan menggunakan alat tangkap trawl mini yang diopeasikan di tiga wilayah estuari yaitu Sungai Banyuasin, Sungai Musi dan Sungai Upang. Pada masing-masing wilayah estuari ditentukan sebanyak empat lokasi sampling. Frekuensi pengambilan sampel dilakukan sebanyak empat kali yaitu pada Maret, Juni, Agustus dan Oktober agar mewakili kondisi musiman.Parameter lingkungan yang dianalisa adalah salinitas, suhu perairan, kecerahan, nitrat, amoniak, total fosfat dan kelimpahan fitoplankton. Hasil penelitian menunjukkan sebanyak 87 spesies ikan telah teridentifikasi. Diperoleh nilai kepadatan biomassa 332,13 – 861,49 kg/km2 di estuari Upang, 590,51 – 2.235,04 kg/km2 di estuari Musi dan 1.296,4 - 33.714,88 kg/km2 di estuari Banyuasin. Spesies ubur-ubur (Aurelia aurita) mendominasi tangkapan pada Agustus hingga Oktober yang mencapai 77,22% dari biomassa total ikan dikarenakan lingkungan yang sesuai untuk keperluan pertumbuhannya. Kepadatan biomassa ikan berkorelasi positif dengan parameter salinitas dan kelimpahan fitoplankton, dan berkorelasi negatif terhadap parameter amoniak. Estuaries of Banyuasin district has a high biodiversity of fish resources and significant contribution to the fisheries production in the South Sumatera Province. The biomass distribution of fish in the estuary fluctuated and probably affected by by salinity and water temperature. This research aims to investigate the correlation between biomass density and environment condition in the estuary of Banyuasin Regency. Sampling was conducted through experimental fishing used a mini trawl that operated in three estuary areas, such as: Banyuasin Rivers, Musi Rivers, and Upang Rivers. Every estuary area was replicated for four sampling sites. Samples were collected during March, June, August and October. The waters parameters analyzed were salinity, water temperature, transparency, nitrate, ammonia, phosphate total, and phytoplankton. The results showed that about 87 species of fish have been identified. The biomass density was 332,13 – 861,49 kg/km2 in estuary Upang, 590,51 – 2.235,04 kg/km2 in estuary Musi and 1.296,4 - 33.714,88 kg/km2 in estuari Banyuasin. A jelly fish (Aurelia aurita) is dominated in August to October, up to 77.22% of total biomass. The biomass density of fish was positively correlated with salinity and phytoplankton abundance, whereas negatively correlated to ammoniac condition.

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3

Yuan, Li Rong, Xiang Ju Cheng, and Zhen Ren Guo. "Estuary Geometric Feature ’s Effecting on Salt-Fresh Water Mixing." Applied Mechanics and Materials 52-54 (March 2011): 448–56. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.448.

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A three dimensional unstructured model was established and estuaries with different cross sectional divergence rates and different bed form were designed to study the estuary geometric feature effecting on salt-fresh water mixing in estuary. The model dispersing 3d domain into unstructured triangular and/or quadrangular elements, has good flexibility to simulate complex bank. By analyzing the horizontal and longitudinal distribution attributes of velocity and salinity field, the effects of cross section divergence rate, the bottom elevation of mouth and the slope inside estuary on salt water intrusion in estuary are studied. The result could act as design basis for the engineering projects which will change estuary’s bank shape or bed form such as estuary regulation and channel dredging.

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4

Tuchkovenko, Yu S., О. P. Garkusha, О. M. Gryb, S. G. Gushcha, Yu М. Denha, K. S. Kalashnik, Kh О. Koieva, et al. "Results of the hydrological, hydrochemical, biological and medico-hydrobiological studies of the Kuialnyk Estuary." Ukrainian hydrometeorological journal, no. 30 (December 27, 2022): 40–64. http://dx.doi.org/10.31481/uhmj.30.2022.04.

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The Kuialnyk Estuary belongs to the group of closed estuaries of the Northwestern Black Sea coast and is a unique water body of national importance with therapeutic properties. The natural territories of the Kuialnyk Estuary were declared as a resort of national importance and form a part of the Kuialnyk National Nature Park. The purpose of the research is to introduce the results of the hydrological, hydrochemical, hydrobiological and medico-biological studies of the condition of the Kuialnyk Estuary and seawater in the Odesa Bay that were conducted in 2021 and to compare them with the results of previous years. This would help to determine the conditions under which the estuary’s natural system is functioning, to ensure preservation and restoration of its natural resources, to prevent their pollution, clogging and depletion, as well as to identify changes of the natural resources of the Kuialnyk Estuary in the context of its artificial replenishment with seawater from the Odesa Bay and varying hydro-ecological factors. The general conclusion is as follows: replenishment of the estuary with seawater during the cold period of 2020-2021, increasing amount of atmospheric precipitation and decreasing rate of evaporation from the estuary’s water surface in 2021 raised the Kuialnyk Estuary’s water level. This led to significant improvement of the estuary’s hydro-ecological condition compared to 2020, however, because of its contamination with petroleum hydrocarbons, some toxic and polycyclic aromatic hydrocarbons, the water quality in 2021 is still assessed as satisfactory. The quality of the bottom sediments of the Kuialnyk Estuary from the environmental perspective is assessed as very poor because of their contamination with petroleum hydrocarbons, organochlorine pesticides and polycyclic aromatic hydrocarbons. The physicochemical composition of colloidal dispersions of the Kuialnyk Estuary’s peloids is barely different as compared to previous years. As per indicators of Eh (2017-2021) and pH (2020-2021), the quality of the peloids within the area used by the sanatorium did not meet the established conditions and the Medical (Balneological) Conclusion. Compared to 2020, the sanitary and microbiological condition of peloids improved in 2021, however, was still unsatisfactory. The characteristics of peloids’ biological activity during different periods of studies correlate with general mineralization fluctuations. Maintaining oil mineralization at a level not higher than 250 g/dm3 is quite important in order to preserve the unique deposit of natural healing resources of the Kuialnyk Estuary. Therefore, solving the following problems remains a priority: reducing the mineralization of the estuary’s water via increase of the rate of clean fresh water supply from various sources instead of using salty seawater; preventing the pollution from anthropogenic sources from entering the estuary (through water runoff from the watercourses flowing into the Kuialnyk Estuary such as the chute from the sandbar, Korsuntsivska and Hildendorfska gullies and others).

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Cavalcante, Geórgenes H., David A. Feary, and Björn Kjerfve. "Effects of Tidal Range Variability and Local Morphology on Hydrodynamic Behavior and Salinity Structure in the Caeté River Estuary, North Brazil." International Journal of Oceanography 2013 (September 8, 2013): 1–10. http://dx.doi.org/10.1155/2013/315328.

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Tidal influence and local morphology on circulation and salt transport are investigated in the Caeté river estuary, a well-mixed estuary along the north coast of Brazil. Velocity, temperature, and salinity data were collected in three different locations along the estuary’s main channel, over three single, 13 h tidal cycles. The aim of this study was to investigate the relationship between tidal distortion and salinity by using classical methods of comparison of three cross-channel circulation characteristics, as well as computation of salt flux and vertical mixing. Findings indicate a flood-ebb asymmetry in currents, due to the distinct funneling morphology of the estuary, with shallow marginal areas being dominant towards the estuary head, while both stratification and shear dominate near the estuary mouth. The tidal currents enhanced vertical diffusion in the mid- and lower reaches, explaining the prevailing weakly stratified conditions, while the dominant well-mixed conditions in the upper estuary are a result of a combination of stronger flood currents and negligible vertical saline gradient. The predominant downstream salt transport supports the conclusion that there is little accumulation of salt in the Caeté river estuary. In addition, findings indicate that tidal correlation and Stokes drift are important components in the upper estuary, while tidal correlation played an important role in the middle estuary, with fluvial discharge most important in the lower estuary.

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Radjawane, Ivonne Milichristi, Grahadi Pandu Mughny, and Gandhi Napitupulu. "Karakteristik Estuari di Muara Angke pada Musim Timur." Jurnal Kelautan Tropis 27, no. 1 (March 1, 2024): 28–38. http://dx.doi.org/10.14710/jkt.v27i1.20679.

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Estuaries are important transitional environments between freshwater and marine ecosystems. These areas are often centers of economic activity, environmental sustainability and natural resources. In this context, this study aims to investigate the estuary characteristics of Muara Angke, particularly in terms of changes in water level, salinity, and the influence of river flow in the face of changing tidal conditions. Research on estuary characteristics in one of the Ciliwung River Estuaries was conducted on August 9-10, 2015. The research area is Muara Angke, North Jakarta, DKI Jakarta Province. The measurement point consists of 11 stations starting from point A1 at the mouth of the estuary to point A11 which is the farthest station point from the estuary, with a distance of 200 m between stations. Oceanographic parameter measurements were made at 3 depths (0.2h; 0.6h and 0.8h) with 4 tidal conditions (towards the tide, tide, towards the ebb and ebb). Angke Estuary has a diurnal tidal type with a range of water levels between 0.98 m - 1.41 m and an average discharge of 7.75 m3/s during the measurement time. The results showed that the Angke Estuary has a partially mixed estuary type with salinity values at the surface increasing relatively small to the middle layer and also the bottom layer decreasing relatively small to the middle layer which indicates vertical mixing from the bottom to the surface. In addition, based on the estuary numbers ( = 0.337; = 0.279; = 0.593), there is a freshwater flow that is smaller or equal to the tidal influence. Salinity intrusion occurs as far as 2 km when conditions are towards high tide and high tide. Estuari merupakan lingkungan peralihan yang penting antara ekosistem air tawar dan laut. Daerah ini sering kali menjadi pusat kegiatan ekonomi, keberlanjutan lingkungan, dan sumber daya alam. Dalam konteks ini, penelitian ini bertujuan untuk menginvestigasi karakteristik estuari Muara Angke, khususnya dalam hal perubahan tinggi muka air, salinitas, dan pengaruh aliran sungai dalam menghadapi perubahan kondisi pasang surut. Penelitian mengenai karakteristik estuari di salah satu Muara Sungai Ciliwung telah dilakukan pada tanggal 9-10 Agustus 2015. Daerah penelitian adalah Muara Angke, Jakarta Utara Provinsi DKI Jakarta. Titik pengukuran terdiri dari 11 stasiun mulai dari titik A1 yang berada di mulut muara sampai dengan titik A11 yang merupakan titik stasiun terjauh dari muara, dengan jarak antar stasiunnya adalah 200 m. Pengukuran parameter Oseanografi dilakukan terhadap 3 kedalaman (0,2 ; 0,6 dan 0,8 ) dengan 4 kondisi pasang surut (menuju pasang, pasang, menuju surut dan surut). Muara Angke memiliki tipe pasang surut diurnal dengan kisaran tinggi muka air antara 0,98 m – 1,41 m dan debit rata-rata sebesar 7,75 m3/s selama waktu pengukuran. Hasil penelitian menunjukan bahwa Muara Angke memiliki tipe estuari tercampur sebagian (partially mixed) dengan nilai salinitas di permukaan yang bertambah relatif kecil ke lapisan tengah dan juga lapisan dasar yang berkurang relatif kecil ke lapisan tengah yang menandakan adanya percampuran secara vertikal dari dasar ke permukaan. Selain itu berdasarkan bilangan-bilangan estuari ( = 0,337; = 0,279; = 0,593) menunjukan adanya aliran air tawar yang besarnya lebih kecil atau sama dengan pengaruh pasang surutnya. Intrusi salinitas terjadi sejauh 2 km ketika kondisi menuju pasang dan pasang.

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Al Hakim, Muhammad Abdul Ghofur, Setyo Budi Susilo, and Jonson Lumban Gaol. "DETEKSI TURBIDITY FRONT MENGGUNAKAN CITRA SATELIT SENTINEL-2 HUBUNGANNYA DENGAN OSEANOGRAFI DI ESTUARI BENGAWAN SOLO." Jurnal Ilmu dan Teknologi Kelautan Tropis 14, no. 3 (January 31, 2023): 337–52. http://dx.doi.org/10.29244/jitkt.v14i3.40172.

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Estuari merupakan daerah percampuran antara massa air tawar dan air laut yang menyebabkan zat-zat di dasar perairan naik ke permukaan sehingga konsentrasi unsur hara menjadi tinggi. Penelitian mengenai pertemuan massa air estuari masih perlu dilakukan terutama terkait turbidity front estuary karena untuk mengetahui kemampuan citra Setinel-2 dalam mendeteksi turbidity front. Selama ini penelitian ini terbatas dari data in situ, oleh karena itu teknologi penginderaan jauh coba diterapkan untuk mendeteksi turbidity front estuary. Penelitian ini bertujuan untuk mengembangkan algoritma TSS lokal dan mendeteksi turbidity front berdasarkan citra satelit Sentinel-2. Metode penelitian ini menggunakan citra Sentinel-2 untuk mengetahui batas turbidity front berdasarkan TSS yang dibandingan dengan data in situ salinitas dan TSS sebagai validasi data. Hasil penelitian ini diketahui algoritma empiris yang diperoleh dari band ratio (merah/(biru+hijau+merah)) pada Sentinel-2 memiliki hasil yang terbaik dengan koefisien korelasi (r) = 0,86. Hasil citra satelit menunjukkan bahwa turbidity front estuary terjadi pada jarak 1,6 – 2,8 km, sedangkan pada data in situ terjadi pada jarak 2 – 4 km di muara Bengawan Solo. Terdapat perbedaan nilai TSS sebesar 1,9182 mg/L antara data in situ dengan citra satelit di daerah turbidity front estuary. Kondisi musim, curah hujan dan pasang surut memengaruhi konsentrasi dan jarak turbidity front dari muara sungai.

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Nugraha, Mohammad Agung, and Tri Prartono. "Investigasi Kontaminasi Minyak Melalui Fingerprint Kimia di Estuari Muara Angke, Cimandiri dan Cilintang." Jurnal Kelautan Tropis 21, no. 1 (April 3, 2018): 1. http://dx.doi.org/10.14710/jkt.v21i1.2366.

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Abstract Investigation of Oil Contamination through Chemical Fingerprint in Muara Angke Estuary, Cimandiri and Cilintang Polycyclic aromatic hydrocarbons (PAHs) and hopanes are one of the biomarker components that can be used in petroleum contamination tracing. The study was conducted with the objective of assessing petroleum contamination in sediment based on Polycyclic Aromatic Hydrocarbon (PAH) and Hopana components in Estuari Muara Angke, Cimandiri and Cilintang. Sediment samples were collected to a depth of ± 10 cm. Sediment samples were dried by freeze-dryer then extracted and fractionated. The fractionated sample was analyzed by gas chromatography-mass spectrometry. Estuary Muara Angke and Cimandiri showed the presence of petroleum contamination while Cilintang was not detected. Keywords : estuary, hopanes, PAH, petroleum, sediment Abstrak Polisiklik aromatik hidrokarbon (PAH) dan hopana merupakan salah satu komponen biomarker yang dapat digunakan dalam penelusuran kontaminasi petroleum. Penelitian dilaksanakan dengan tujuan mengkaji kontaminasi petroleum dalam sedimen berdasarkan komponen Polisiklik Aromatik Hidrokarbon (PAH) dan Hopana di Estuari Muara Angke, Teluk Jakarta, Cimandiri-Teluk Pelabuhan Ratu dan Cilintang, Ujung Kulon. Contoh sedimen dikumpulkan hingga kedalaman ± 10 cm. Contoh sedimen dikeringkan dengan alat freeze-dryer kemudian dilakukan ekstraksi dan fraksinasi. Sampel yang telah terfraksinasi dianalisis dengan alat kromatografi gas–spektrometri massa. Estuari Muara Angke dan Cimandiri menunjukkan adanya kontaminasi petroleum sedangkan Cilintang tidak terdeteksi.Kata kunci : estuari, hopana, PAH, petroleum, sedimen

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Kushadiwijayanto, Arie Antasari, Setra Kusumardana, Ikha Safitri, Warsidah Warsidah, Mega Sari Juane Sofiana, Apriansyah Apriansyah, Yusuf Arief Nurrahman, Syarif Irwan Nurdiansyah, Sukal Minsas, and Sella Agustina. "Inisasi Eduwisata Kubu Raya Estuary Cruise Sebagai Upaya Konservasi Inklusif." Jurnal Pengabdian kepada Masyarakat Nusantara 5, no. 1 (February 27, 2024): 956–62. http://dx.doi.org/10.55338/jpkmn.v5i1.2692.

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Teluk Bengkolan (Kabupaten Kubu Raya, Kalimantan Barat) merupakan kawasan laut semi tertutup (estuaria) serta memiliki kondisi ekosistem mangrove sangat baik dan memiliki potensi ekonomi yang sangat tinggi. Meskipun demikian, terdapat dilema yang membebani usaha peningkatan kesejahteraan masyarakat pesisir Teluk Bengkolan. Peran Program Studi Ilmu Kelautan Universitas Tanjungpura (PSIK Untan) menjadi sangat penting dalam mengatasi dilema ini. Dan untuk mengakomodir tridharma tersebut, PSIK Untan membuat program inovasi wisata pendidikan bertajuk Pelayaran Estuari Kubu Raya (Estuary Kubu Raya Cruise) yang bertujuan untuk meningkatkan ekonomi masyarakat melalui wisata dan upaya konservasi melalui penyadartahuan khalayak. Kegiatan Pelayaran Pendidikan ini dilakukan dengan melibatkan berbagai pihak dan dilaksanakan pada tanggal 13 – 15 Oktober 2023 di Estuari Teluk Bengkolan, Kabupaten Kubu Raya, Provinsi Kalimantan Barat. Pihak yang terlibat dalam kegiatan ini, yaitu dosen dan mahasiswa PSIK Untan, Yayasan Webe Konservasi Ketapang, Lembaga Pengelola Hutan Desa Sugai Nibung, Pemerintah Kabupaten Kubu Raya, dan KM Arif Azam Jaya. Pelayaran yang berlangsung selama 3 hari 2 malam memberikan pengamalan belajar bagi peserta pelayaran. Manfaat dari kegiatan ini tidak hanya diperoleh peserta namun juga masyarakat Desa Sungai Nibung. Pelayaran memberi dampak pada peningkatan minat peserta dan masyarakat untuk menjaga dan mengelola lingkungan berkelanjutan serta membuka peluang peningkatan ekonomi bagi masyarakat.

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Cao, Yufen, Baoyou Zheng, Liancheng Sun, and Feng Gao. "THE RESEARCH OF REGULATION MEASURES ON BRAIDED CHANNEL IN YALU RIVER ESTUARY." Coastal Engineering Proceedings 1, no. 32 (January 31, 2011): 5. http://dx.doi.org/10.9753/icce.v32.posters.5.

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By analyzing nature condition of Yalu River estuary part and many domestic and overseas rivers esturary regulation experience,the regulation principles are put forward and the regulation aim is confirmed according to the requirement of west project of china. By numerical model, the regulation measures on baided channel in Yalu River Estuary have been studied. Two measures are recommended by the research.One which is single dredging way,can be as the 1st stage regulation measure;the other measure which is mixed way of regulation and dredging way,can be as the 2nd stage regulation measure.

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Dissertations / Theses on the topic "Estuary"

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Mitchell, John Dickerson. "Estuary Water Movement." W&M ScholarWorks, 1986. https://scholarworks.wm.edu/etd/1539617567.

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Tattersall, Graham Richard. "Tamar estuary sediment dynamics." Thesis, Bangor University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341218.

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Vromans, Deborah Claire. "Macrophyte phenology in a temporarily open/closed Estuary compared with a permanently open Estuary." Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/1393.

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Temporarily open/closed estuaries (TOCEs) are unpredictable environments that change in response to mouth condition, which is influenced by freshwater flooding or sea storm surges. The aim of the study was to determine whether macrophyte phenology in a TOCE was event driven rather than cyclically predictable and if it differed from permanently open estuaries (POEs). Macrophyte growth and flowering phenology in response to environmental conditions was investigated in the East Kleinemonde Estuary (TOCE) and the Kowie Estuary (POE) along the eastern coastline of South Africa. The lack of freshwater flooding due to low rainfall coupled with several overwash events resulted in a prolonged period of mouth closure from September 2008 to the end of this study period in 2010. This in turn caused the inundation of the supratidal and intertidal habitats, high water level (> 1.57 m amsl) and high salinity (30 - 42 ppt) in the TOCE. Principle Components Analysis showed that high water level and reduced sediments were the most significant environmental factors affecting macrophyte phenology. Macrophyte phenology in the POE was primarily driven by temperature, sediment redox potential and salinity. The saline high water level and reduced sediment significantly reduced macrophyte cover in all habitats in the TOCE. Macrophytes in the POE maintained high cover abundance due to seasonal re-growth compared to the TOCE where cover declined over the sampling period due to the high water level. Subsequent to water level dropping by as little as 11 - 20 cm in the TOCE, the intertidal species Sarcocornia tegetaria and Salicornia meyeriana completed their life-cycles and produced viable seeds within four and three months of germinating respectively. In contrast, the Sarcocornia hybrid and S. meyeriana in the POE took longer to complete their life-cycles, namely seven and nine months respectively, while S. tegataria did not germinate in situ but reproduced vegetatively despite producing seed. In the TOCE, the submerged species Ruppia cirrhosa and Chara vulgaris completed their life-cycles within five and three months and produced a maximum of 26 242 and 196 998 seeds m-2 respectively. Due to high water level and prolonged inundation, the reproductive periods were shorter for the intertidal and reed and sedge species in the TOCE compared to the POE. Seed output during the two reproduction periods varied between the two estuaries. Sarcocornia decumbens and S. tegetaria produced a substantially higher number of seeds in the TOCE compared to the POE, namely 0 - 102 847 versus 20 661 - 48 576 seeds m-²; and 7 001 - 45 542 versus 1 587 – 16 958 seeds m-² respectively. Seed output in the TOCE was significantly higher in S. tegetaria during the second reproduction period despite the significantly lower plant cover, which may be a function of the stressful environment in the TOCE. Seed production of S. meyeriana was significantly higher in the POE compared to the TOCE, with 264 224 - 640 292 compared with 24 050 - 27 643 seeds m-², due to higher plant cover in the POE. The research suggests that macrophyte phenology in the TOCE was significantly influenced by mouth condition. Further, macrophytes were able to demonstrate considerable phenotypic plasticity in response to changing and unfavourable environmental conditions. These data can be used in mouth management plans and freshwater requirement studies in TOCEs to ensure that macrophytes can complete their life-cycles and produce viable seeds for the safeguarding of habitat persistence and ecological processes. In impacted estuaries where artificial mouth opening is practised and the macrophytes have been severely degraded or extirpated, management should ensure that the intertidal and supratidal habitats are not inundated during peak flowering and seed production periods i.e. late spring to early autumn (November to March).

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Louw, Liezel. "The zooplankton of Mngazana estuary." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/702.

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The zooplankton community of the main channel of the Mngazana estuary was investigated on six occasions over one year. Spatial and temporal variability in zooplankton abundance and distribution were sampled using two slightly modified WP2 plankton nets of 200 μm mesh and 57 cm mouth diameter. Nets were fitted with calibrated Kahlsico 005 WA 130 flow meters. A set of environmental variables were also measured at each site. The water column of the main channel of Mngazana estuary was stratified in summer but well mixed in winter. Temperature progressively increased from the lower stations to the upper reaches of the estuary. Maximum vertical temperature differences occurred in the middle estuarine reaches. Salinity progressively decreased from the lower reaches to the upper reaches, but was generally above 26 from Station 3 to Station 8. Only during November 2005, were salinity readings low due to heavy rains. Summer salinity values were always lower than the winter salinity values as a result of summer rainfall. A total of 76 zooplankton taxa were identified. The estuarine copepods Acartia natalensis and Pseudodiaptomus hessei dominated the assemblage, with maximum abundances in the middle to upper reaches. Acartia natalensis reached high densities in winter (> 50 000 m-3) although lowest abundances were recorded when maximum rainfall was received (November 2005). Wooldridge (1977) and Deyzel (2004) recorded maximum densities during summer. Pseudodiaptomus hessei reached high densities (> 17 000 m-3) during the highest rainfall month. Previous studies indicated that this pioneer species is able to recover quickly after a flood and subsequently increase rapidly in numbers. The mysid, Mesopodopsis africana reached high densities (> 5 000 m-3) in the middle estuarine reaches during summer. Ichtyofauna, brachyura and anomura were important contributors to the merozooplankton component of the community. The maximum number of species was recorded during winter in the lower estuarine reaches, when vertical differences in salinities were minimal.

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Pritchard, William James. "Anammox in a temperate estuary." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8852.

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The seasonal variation of anammox is yet to be comprehensively studied, unlike denitrification, the more traditional sink for fixed nitrogen. A seasonal study of anammox, denitrification and benthic oxygen consumption using the revised isotope pairing technique is presented in Chapter 2. Experimental temperature and NO3- concentration were kept constant throughout so that the capacity of the sediment for anammox could be estimated. Similar seasonal variations in the rates of anammox, denitrification and oxygen consumption suggest that anammox is controlled by the availability of organic carbon. Furthermore the effect of tidal inundation by overlying water rich in NO3- was investigated by measuring rates of anammox, denitrification and oxygen consumption at three tidal elevations throughout the year. A significant relationship between anammox and denitrification was established at each tidal elevation, which increased in strength as length of inundation decreased. To complement this seasonal study, additional experiments were undertaken, which are described in Chapter 3, to determine how anammox, denitrification and sediment metabolism responds to variations in experimental NO3- concentration and temperature. There were significant increases in rates of anammox, denitrification and sediment metabolism with temperature until 20oC when rates of anammox began to reduce. Furthermore there was significant variation in the response of all three processes to temperature in samples collected at different dates, which suggested that reduced bioavailability of organic carbon in the winter months was limiting the response to temperature. In addition to exploring how inorganic N is cycled in estuarine sediments, the ability of estuarine sediments to oxidize urea via nitrite was examined using 15N and 13C labelled substrates. Results, which are presented in Chapter 4, indicate that urea added to anaerobic sediment slurries was rapidly hydrolysed to ammonium before being oxidized via the anammox pathway.

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Monteiro, Marcela Cunha. "Natural and anthropogenic control of water quality of an Amazon estuary : the Caeté estuary (Brazil)." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/406005.

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In the Amazon region, few data are available on the impacts caused by the urban settlements found in the proximity of estuaries. In the estuary of the Caeté River, the focus of the present study, the nutrient input is controlled by both natural features and anthropogenic disturbances generated by local communities. In this context, the principal aim of the study was to analyze the quality of the water of the Caeté estuary, and the relative contribution of natural and anthropogenic forcings. To this end, climatological, hydrodynamic and hydrological features were monitored, and potential sources of pollution were identified in the different sectors of the Caeté estuary. Potential future scenarios for the estuary are also described, based on the analysis of anthropogenic and natural processes, which may contribute to the quality of its waters. The results indicate higher levels of nutrient input in the upper sector of the estuary, where 90% of the local population is concentrated, and most of the region's commercial activities (e.g., public markets, ice factories, and docking facilities) are found. As a consequence, eutrophic waters with high concentrations of faecal coliforms (up to 1100 MPN/100 ml) were observed during spring tides in the dry season when the transport and dilution of the estuary's waters are less effective. Eutrophication also occurred to a lesser extent in the other (middle and lower) estuary sectors, although in this case, the results indicate the influence of natural processes, reflecting the high nutrient concentrations of this Amazonian region. During neap tides, eutrophication was less pronounced, and water quality was improved in both dry and rainy seasons. A comparative analysis showed that, under similar conditions of the flood cycle, the trophic status of the estuary varied little between spring and neap tides. As the population of the region surrounding the Caeté estuary is increasing by 10-20% per decade, resulting in a significant increase in human pressures and impacts on the study area. The current eutrophication status of the estuary may have permanent effects, which may be aggravated during the dry season or drought events, when the estuary is more vulnerable to the retention of nutrients. The water quality of the Caeté Estuary can be improved by the implementation of the following measures: (i) urban planning to control the discharge of sewage, (ii) the construction of water treatment plants to reduce the input of untreated effluents, and (iii) the introduction of regulations for the use of water based on its current quality.
Los impactos más frecuentes en los estuarios se deben a los asentamientos urbanos no planificados. Como consecuencia de dichos asentamientos, los estuarios se han visto expuestos a una serie de perturbaciones ambientales, tales como el incremento en la entrada de nutrientes y cambios en los usos del suelo y en la hidrología local. En el estuario del río Caeté, objeto de este estudio, las perturbaciones antrópicas originadas en las comunidades de alrededor del estuario y el funcionamiento natural del sistema controlan el input de nutrientes en el estuario. El objetivo principal de esta tesis es analizar la calidad del agua del estuario del río Caeté y la influencia de las forzantes naturales y antrópicas que actúan en él. Para tal efecto, los aspectos climáticos, hidrodinámicos e hidrológicos fueron monitorizados y se identificaron las fuentes potenciales de polución en el estuario. Además, se describieron una serie de potenciales futuros escenarios para el estuario basándose en los procesos naturales y antrópicos que pueden afectar la calidad del agua en las próximas décadas. Los resultados muestran que el input de nutrientes disueltos es mayor en el sector superior del estuario, que concentra el 90% de la población local y tiene una alta incidencia de actividades comerciales (mercados públicos, fábricas de hielo, astilleros, entre otros). Como consecuencia, se observaron aguas eutróficas con altas concentraciones de coliformes fecales (até 1100 NMP/100 ml) durante las mareas vivas en la estación seca, cuando el transporte y/o dilución son menos efectivas. La eutrofización, aunque menos pronunciada, también ocurrió en el resto de sectores (medio y bajo estuario). Sin embargo, estos resultados parecen indicar que esto puede deberse a una condición natural de la región amazónica, la cual es naturalmente enriquecida con una elevada cantidad de nutrientes. Durante mareas muertas, la eutrofización fue menos pronunciada y la calidad de agua presentó mejores condiciones en todas las estaciones monitorizadas. El análisis comparativo ha mostrado que bajo condiciones similares (marea llenante) el estado trófico entre mareas vivar y muertas presenta similitudes. Considerando que la población se incrementa entre 10 y 20% por década en la región, esto puede resultar en un incremento significante de la presión humana y del impacto alrededor del estuario. En este caso, el estado eutrófico observado actualmente podría afectar el estuario de manera permanente. La situación podría agravarse durante la estación seca o eventos de sequía, cuando el estuario es más susceptible a retener los nutrientes. Con el objetivo de mejorar la calidad del agua, se podrían implementar ciertas medidas en el estuario del Caeté basadas en (i) planeamiento urbanístico para controlar la descarga de efluentes en el estuario (ii) construcción de una estación de tratamiento de agua para reducir la entrada de efluentes no tratados y (iii) regular los usos del agua del estuario en función de la calidad de agua.

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Ibrahim, Zelina Zaiton. "An integrated approach to the investigation of an equatorial estuary : the Klang River Estuary, Malaysia." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328682.

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Moore, Rowena Deborah. "Hydrodynamic and Morphometric Modelling of a Macro-Tidal Estuary : The Dee Estuary of NW England." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511030.

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Koroknay, Brittani J. "Quantifying Watershed Loads to a Low Relief, Coastal Plain Estuary, the New River Estuary, N.C." W&M ScholarWorks, 2012. https://scholarworks.wm.edu/etd/1539617915.

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Watershed modeling is an important tool for quantifying the inputs of fresh water, sediments, and nutrients into receiving estuaries and potential changes in those loads under scenarios including changes in land use and climate. There are a variety of existing watershed loading models available, from simple to complex, but a spectrum of these models have yet to be applied and compared in a low relief, coastal plain setting. This project has been conducted as part of the Defense Coastal/Estuarine Research Program (DCERP), which has focused on the impact of Marine Corp Base Camp Lejeune (MCBCL) and activities in the surrounding watersheds on the New River Estuary (NRE), located in southeastern North Carolina. As part of DCERP, nine sub-watersheds on MCBCL with contrasting land use were monitored to allow computation of freshwater, sediment, and nutrient loads to the NRE. In the current project, these loads were used to assess the performance of two existing watershed models using the Environmental Protection Agency’s (EPA) Better Assessment Science Integrating point and Nonpoint Sources (BASINS) 4.0 modeling suite: the relatively complex, temporally-resolved Hydrologic Simulation Program-Fortran (HSPF), and the relatively simple, annually-resolved Pollutant Loading (PLOAD) model. For both models, the 2001 National Land Cover Data were used for analysis; this dataset was compared to the recently released 2006 NLCD dataset and changes were found to be small. Monthly HSPF model output generally followed precipitation trends, and tended to over-predict freshwater stream flow and under-predict sediment and nutrient loads. PLOAD reproduced annual loads of total nitrogen within measured ranges, under-predicted annual loads of total suspended solids, and was less successful at predicting PO43- loads. Results from HSPF and PLOAD were combined with those from six other modeling approaches applied during DCERP to complete a spectrum of models from simple to complex. Model output from HSPF and PLOAD was scaled up to estimate loads entering the NRE from that portion of its watershed lying on MCBCL. Model estimates suggest that approximately 5-6% of the total nitrogen entering the NRE from external sources originates from the MCBCL watershed, a value on the lower end but within the range of estimates from other models applied to the system. Scenarios were run within HSPF to investigate how the conversion of forested land to impervious surfaces on MCBCL may alter existing loads; the model was relatively insensitive to changes in impervious surfaces. Neither PLOAD nor HSPF predicted nitrogen, phosphorus, and sediment loads better than the other watershed models applied during DCERP. The results of this study combined with development of other models suggest that simpler models, such as PLOAD, are able to estimate loads to the NRE as well as more highly technical models, such as HSPF, and that regardless of model choice a focus on loads at the annual scale is most justifiable.

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Chan, Terence. "Phytoplankton dynamics in a seasonal estuary." University of Western Australia. Centre for Water Research, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0089.

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[Truncated abstract] The Swan River is a highly seasonal estuary in the south-west of Western Australia. Salinity may vary from fresh to marine at various times throughout the estuary, depending mostly on the intensity of freshwater discharge. There are occasional problematic dinoflagellate blooms which have spurred investigation of the dynamics of the phytoplankton community. The objective of this research was to examine how phytoplankton biomass and species' successions are influenced by the multiple variables in the aquatic ecosystem, and, if possible, to determine the dominant factors ... Comparisons of phytoplankton nutrient limitation simulations with experimental observations from field bioassays require further investigation, but reinforce findings that nutrients may only limit phytoplankton biomass when there is a convergence of favourable hydrological and hydrodynamic conditions. The Swan River estuary has undergone substantial hydrological modifications from pre-European settlement. Land clearing has increased freshwater discharge up to 5- fold, while weirs and reservoirs for water supply have mitigated this increase and reduced the duration of discharge to the estuary. Nutrient loads have increased approximately 20-fold from pre-European levels. The individual and collective impacts of these hydrological changes on the Swan River estuary were examined using the hydrodynamic-ecological numerical model. The simulation results indicate that despite increased hydraulic flushing and reduced residence times, increases in nutrient loads are the dominant perturbation, producing increases in the frequency and biomass of blooms by both estuarine and freshwater phytoplankton. By comparison, changes in salinity associated with altered seasonal freshwater discharge have a limited impact on phytoplankton dynamics. Reductions of nutrient inputs into the Swan River estuary from its catchment will provide a long-term improvement in water quality but manipulations of freshwater discharge have the potential to provide a provisional short-term remediation measure allowing at least partial control of phytoplankton bloom potential and eutrophication.

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Books on the topic "Estuary"

1

Bunny, Sam. Estuary. Colombo: Bay Owl Press, 2011.

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Bunny, Sam. Estuary. Colombo: Bay Owl Press, 2011.

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Savage, Georgia. The estuary. Saint Paul, Minn: Graywolf Press, 1993.

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Savage, Georgia. The estuary. St Lucia: University of Queensland Press, 1987.

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J, Kennish Michael, ed. Estuary restoration and maintenance: The National Estuary Program. Boca Raton, Fla: CRC Press, 2000.

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Program, Maine Coastal, ed. Estuary profile series. Augusta, Me. (184 State St., Augusta 04333): Maine Coastal Program, Maine State Planning Office, 1991.

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David, Collins, and Fox Peter, eds. The Mersey estuary. Liverpool: Mersey Estuary Conservation Group, 1992.

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India, Zoological Survey of, ed. Rushikulya estuary, Orissa. Calcutta: The Survey, 1992.

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Hobbs, C. H. York Estuary sediments. Gloucester Point, Va: School of Marine Science, Virginia Institute of Marine Science, 1994.

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Kennish, Michael J. Estuary Restoration and Maintenance. London: Taylor and Francis, 1999.

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Book chapters on the topic "Estuary"

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Vilas, Federico, Belén Rubio, Daniel Rey, and Ana M. Bernabeu. "Estuary." In Encyclopedia of Planetary Landforms, 1–7. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-9213-9_621-1.

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Vilas, Federico, Belén Rubio, Daniel Rey, and Ana M. Bernabeu. "Estuary." In Encyclopedia of Planetary Landforms, 725–30. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-3134-3_621.

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Bruner de Miranda, Luiz, Fernando Pinheiro Andutta, Björn Kjerfve, and Belmiro Mendes de Castro Filho. "Estuary Classification." In Fundamentals of Estuarine Physical Oceanography, 73–115. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3041-3_3.

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Davidson, Nick C. "Estuary Types." In The Wetland Book, 1–7. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6172-8_338-1.

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Davidson, Nick C. "Estuary Types." In The Wetland Book, 1507–13. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-90-481-9659-3_338.

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Levings, Colin. "Estuary Conservation." In Encyclopedia of Estuaries, 303–4. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_190.

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Kowalewska-Kalkowska, Halina, and Roman Marks. "Estuary, Estuarine Hydrodynamics." In Encyclopedia of Marine Geosciences, 1–7. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6644-0_164-1.

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Kowalewska-Kalkowska, Halina, and Roman Marks. "Estuary, Estuarine Hydrodynamics." In Encyclopedia of Marine Geosciences, 235–38. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6238-1_164.

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Wollast, R. "The Scheldt Estuary." In Pollution of the North Sea, 183–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-73709-1_11.

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Morse, Brian. "Estuary Ice Cover." In Encyclopedia of Earth Sciences Series, 281–87. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-2642-2_144.

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Conference papers on the topic "Estuary"

1

Пономаренко, О., and О. Москалець. "ФОНЕТИЧНІ ОСОБЛИВОСТІ ESTUARY ENGLISH." In VIІ Міжнародна науково-практична конференція «Психолого-педагогічні, правові та соціально-культурні проблеми сучасного суспільства». Кременчуцький національний університет імені Михайла Остроградського, 2023. http://dx.doi.org/10.32782/fphisn.2023.3.108-109.

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Zhibin Luo, Weiran Pan, Li Li, and Guorong Zhang. "Salinity fronts at Jiulongjiang estuary." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5965054.

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Chen, Jay Chung, and Lai Ah Wong. "Inverse Estimation of Estuary Flux." In Eighth International Conference on Estuarine and Coastal Modeling. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40734(145)54.

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Han, Yufang, and Chuanteng Lu. "Morphological Interactions between Navigation Channel and Estuary after the Improvement Works in Yangtze Estuary." In The 9th International Conference on Asia and Pacific Coasts 2017 (APAC 2017). WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813233812_0040.

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Whitehouse, Richard J. S. "Predicting Estuary Morphology and Process: An Assessment of Tools Used to Support Estuary Management." In Seventh International Conference on Estuarine and Coastal Modeling. Reston, VA: American Society of Civil Engineers, 2002. http://dx.doi.org/10.1061/40628(268)22.

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Pu, Wang, Gu Zhitong, Ye Shengbo, and Liu Feng. "Influence of the Mouth Bar on Saltwater Intrusion in Microtidal Estuary of Modaomen Estuary." In 15th International Conference on Hydroinformatics. Spain, Madrid: The International Association for Hydro-Environment Engineering and Research (IAHR), 2024. http://dx.doi.org/10.3850/iahr-hic2483430201-181.

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Karunarathna, Harshinie, Dominic E. Reeve, Dan Fox, Sam Box, Nigel Pontee, Andrew Chadwick, and John Lawrence. "APPRAISING SPIT DYNAMICS AND ESTUARY RESPONSES: A COASTAL MANAGEMENT STUDY FROM THE EXE ESTUARY, UK." In Proceedings of the 31st International Conference. World Scientific Publishing Company, 2009. http://dx.doi.org/10.1142/9789814277426_0349.

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Cokgor, Sevket. "SEDIMENT DYNAMICS IN GOLDEN HORN ESTUARY." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/3.1/s12.082.

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Day, R. W., A. J. Franzsen, and J. Rogers. "Pleistocene Estuary Of The Orange River." In 1st SAGA Biennial Conference and Exhibition. European Association of Geoscientists & Engineers, 1989. http://dx.doi.org/10.3997/2214-4609-pdb.222.010.

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de Jong, H., and F. Gerritsen. "Stability Parameters of Western Scheldt Estuary." In 19th International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1985. http://dx.doi.org/10.1061/9780872624382.206.

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Reports on the topic "Estuary"

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Kastaschuk, R. A., J. L. Luternauer, and M. A. Church. Sedimentary processes in the estuary. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/210036.

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Mooney, P. F. Sustainable development for the Fraser River estuary. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2004. http://dx.doi.org/10.4095/215815.

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Alokhina, Tetiana, and Vadym Gudzenko. Distribution of radionuclides in modern sediments of the rivers flowing into the Dnieper-Bug Estuary. EDP Sciences, 2021. http://dx.doi.org/10.31812/123456789/4617.

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The article presents the results of large-scale studies of the content and distribution of natural and man-made radionuclides in the sediments of the rivers flowing into the Dnieper-Bug estuary. The article also presents the results of the granulometric analysis of the surveyed water bodies. The data about natural radioactive elements in the sediments rivers flowing into the Dnieper-Bug estuary obtained in this research are demonstrated moderate specific activity, which, however, clearly correlates with the granulometric composition of sediments. The 137Cs determined by us is contained in the sediments of all studied water bodies and the places of it greatest concentration coincide with the areas in which the sediment is represented mainly by the pelitic fraction. The data obtained in this research can serve as a baseline data in natural radionuclides concentration in sediments rivers flowing into the Dnieper-Bug estuary. The obtained data can also be used for further monitoring of the specific activity of man-made radionuclides, in particular 137Cs.

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Brandeis, Thomas J., Francisco J. Escobedo, Christina L. Staudhammer, David J. Nowak, and Wayne C. Zipperer. San Juan Bay Estuary watershed urban forest inventory. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station, 2014. http://dx.doi.org/10.2737/srs-gtr-190.

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Irwin, Christopher S. Dynamics of Destratification in the Severn River Estuary. Fort Belvoir, VA: Defense Technical Information Center, May 1997. http://dx.doi.org/10.21236/ada418475.

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Li, Honghai, Mitchell Brown, Tanya Beck, Ashley Frey, Julie Rosati, Mark Habel, John Winkelman, and Irene Watts. Merrimack Estuary and Newburyport Harbor sediment management studies. Coastal and Hydraulics Laboratory (U.S.), July 2018. http://dx.doi.org/10.21079/11681/27405.

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Thom, Ronald, Nichole Sather, G. C. Roegner, and Daniel L. Bottom. Columbia Estuary Ecosystem Restoration Program. 2012 Synthesis Memorandum. Fort Belvoir, VA: Defense Technical Information Center, January 2013. http://dx.doi.org/10.21236/ada586179.

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Campbell, C. Preliminary geohazard evaluation of the St. Laurence Estuary. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2007. http://dx.doi.org/10.4095/224419.

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Brandeis, Thomas J., Francisco J. Escobedo, Christina L. Staudhammer, David J. Nowak, and Wayne C. Zipperer. San Juan Bay Estuary watershed urban forest inventory. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station, 2014. http://dx.doi.org/10.2737/srs-gtr-190.

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Syvitski, J. P. M., and D. B. Praeg. Quaternary seismo-stratigraphy of the lower St. Lawrence Estuary. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/128158.

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