Academic literature on the topic 'Impact sedimentation'

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Journal articles on the topic "Impact sedimentation"

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Hadley, Richard F. "Reservoir Sedimentation: Impact, Extent, and Mitigation." Eos, Transactions American Geophysical Union 69, no. 37 (1988): 850. http://dx.doi.org/10.1029/88eo01110.

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Hilmi, Endang, Lilik Kartika Sari, Tri Nur Cahyo, Amron Amron, and Asrul Sahri Siregar. "The Sedimentation Impact for the Lagoon and Mangrove Stabilization." E3S Web of Conferences 324 (2021): 02001. http://dx.doi.org/10.1051/e3sconf/202132402001.

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Sedimentation causes land accretion, silting river water, lagoon, and mangrove degradation. The current study aims to analyze the potential and the impact of sedimentation toward the potential of the lagoon and mangrove ecosystem in Segara Anakan Lagoon. The research methods used mapping analysis, total suspended solid analysis (TSS), sedimentation rate analysis, biodiversity analysis, and mangrove covering. The result showed that (1) the value of TSS between 0.25-1,16 g L-1 (2) sediment flux between 6,8 - 257,7 g m-2s-1 (3) annual rate of sedimentation in West Segara Anakan Lagoon (W-SAL) between 13.82 – 15.49 m yr-1. (4) The effects of sedimentation were (a) the remaining lagoon of West Segara Anakan Lagoon (W-SAL) which was 1.200 ha, (b) land accretion in W-SAL between 27.24 – 160.18 m (1994 – 2003) and 20.91 – 107.55 m (2003 2014), (c) the remaining mangrove of SAL less than 2594 ha (d) the mangrove diversity ranged between 0.48 – 1.71 (low – moderate), (e) the mangrove density of trees were 46 - 205 trees ha-1 (degraded) (5) mangrove landscape was developed to reduce the impact of sedimentation, especially the first zone of mangrove landscaping was dominated by Aegiceras Floridum, Avicennia Alba, Avicennia Marina, Sonneratia Caseolaris, and Sonneratia alba.
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Cesare, Giovanni De, Anton Schleiss, and Felix Hermann. "Impact of Turbidity Currents on Reservoir Sedimentation." Journal of Hydraulic Engineering 127, no. 1 (January 2001): 6–16. http://dx.doi.org/10.1061/(asce)0733-9429(2001)127:1(6).

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Azad, Abdus Samad, Henning Dypvik, and Elin Kalleson. "Sedimentation in marine impact craters — Insight from the Ritland impact structure." Sedimentary Geology 318 (April 2015): 97–112. http://dx.doi.org/10.1016/j.sedgeo.2015.01.001.

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Powell, Chris D., David E. Quain, and Katherine A. Smart. "The Impact of Sedimentation on Cone Yeast Heterogeneity." Journal of the American Society of Brewing Chemists 62, no. 1 (January 2004): 8–17. http://dx.doi.org/10.1094/asbcj-62-0008.

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Higgitt, David. "Book Review: Human impact on erosion and sedimentation." Progress in Physical Geography: Earth and Environment 22, no. 3 (September 1998): 421–22. http://dx.doi.org/10.1177/030913339802200316.

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Dr.S.A.NAYAKAWADI, Dr S. A. NAYAKAWADI. "Impact of Sugar Industry Environment on Erythrocyte Sedimentation Rate of Sugar Industry Workers." International Journal of Scientific Research 3, no. 7 (June 1, 2012): 515–16. http://dx.doi.org/10.15373/22778179/july2014/163.

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van Bijnen, M., H. Korving, and F. Clemens. "Impact of sewer condition on urban flooding: an uncertainty analysis based on field observations and Monte Carlo simulations on full hydrodynamic models." Water Science and Technology 65, no. 12 (June 1, 2012): 2219–27. http://dx.doi.org/10.2166/wst.2012.134.

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In-sewer defects are directly responsible for affecting the performance of sewer systems. Notwithstanding the impact of the condition of the assets on serviceability, sewer performance is usually assessed assuming the absence of in-sewer defects. This leads to an overestimation of serviceability. This paper presents the results of a study in two research catchments on the impact of in-sewer defects on urban pluvial flooding at network level. Impacts are assessed using Monte Carlo simulations with a full hydrodynamic model of the sewer system. The studied defects include root intrusion, surface damage, attached and settled deposits, and sedimentation. These defects are based on field observations and translated to two model parameters (roughness and sedimentation). The calculation results demonstrate that the return period of flooding, number of flooded locations and flooded volumes are substantially affected by in-sewer defects. Irrespective of the type of sewer system, the impact of sedimentation is much larger than the impact of roughness. Further research will focus on comparing calculated and measured behaviour in one of the research catchments.
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Wilkinson, B. H., and B. J. McElroy. "The impact of humans on continental erosion and sedimentation." Geological Society of America Bulletin 119, no. 1-2 (January 1, 2007): 140–56. http://dx.doi.org/10.1130/b25899.1.

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Renshaw, C. E., K. Abengoza, F. J. Magilligan, W. B. Dade, and J. D. Landis. "Impact of flow regulation on near-channel floodplain sedimentation." Geomorphology 205 (January 2014): 120–27. http://dx.doi.org/10.1016/j.geomorph.2013.03.009.

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Dissertations / Theses on the topic "Impact sedimentation"

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Lees, E. J. "The impact of chemically assisted sedimentation on downstream treatment processes." Thesis, Cranfield University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391517.

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Elleithy, Dina Mostafa Abdelmonium Hassan. "Impact of Physical Clogging Due to Sedimentation on Soil and Reservoir Hydraulic Performance." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263633.

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京都大学
新制・課程博士
博士(工学)
甲第23172号
工博第4816号
京都大学大学院工学研究科都市社会工学専攻
(主査)教授 角 哲也, 准教授 竹門 康弘, 准教授 Sameh Kantoush
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DGAM
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Senaputra, Alexander. "The impact of desilication products on the flocculation and sedimentation properties of bauxite residue." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/1522.

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In the Bayer processing of bauxite, dissolved silica re-precipitates as aluminosilicates or desilication products (DSPs) that adversely affect residue separation by flocculation and thickening prior to product precipitation. DSP was shown to form at the surface of hematite, impacting upon the extent, efficiency and mechanism of aggregation with a number of different polymer reagents. Real-time measurement of aggregate properties provided new insights on fines capture. The practical implications for full-scale feedwell flocculation were explored.
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Smith, Michelle Leigh. "Impact of sediment resuspension and photochemistry on dissolved organic carbon and copper speciation /." Electronic version (PDF), 2003. http://dl.uncw.edu/etd/2003/smithm/michellesmith.pdf.

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Hales, Wendy J. "The impact of human activity on deltaic sedimentation, marshes of the Fraser River delta, British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ48641.pdf.

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LeMay, Lynsey E. "The Impact of Drainage Ditches on Salt Marsh Flow Patterns, Sedimentation and Morphology: Rowley River, Massachusetts." W&M ScholarWorks, 2007. http://www.vims.edu/library/Theses/LeMay07.pdf.

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Belete, Mulugeta Dadi [Verfasser]. "The impact of sedimentation and climate variability on the hydrological status of Lake Hawassa, South Ethiopia / Mulugeta Dadi Belete." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1045872083/34.

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Alves, Rachel Cristina Prehl [UNESP]. "Monitoramento de características físico-químicas da água e taxas de sedimentação de tripton no Córrego da Arribada (Baixo Tietê-SP) relacionadas à piscicultura em tanques-rede." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/86702.

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Made available in DSpace on 2014-06-11T19:22:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-07-24Bitstream added on 2014-06-13T19:48:40Z : No. of bitstreams: 1 alves_rcp_me_jabo.pdf: 2216450 bytes, checksum: 3a9202bb2a67f1b43fa4f21f4c14b6ea (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A água é usada para os mais variados fins: abastecimento, irrigação, geração de energia elétrica, lazer, aqüicultura, local de despejo de efluentes domésticos e industriais, etc. No caso da aqüicultura, a criação em tanques-rede introduz diretamente no corpo d’água uma grande quantidade de matéria orgânica. Essa atividade pode contribuir para acelerar os processos de eutrofização do meio devido aos aportes de nutrientes e material em suspensão provenientes, principalmente, do excedente de alimento, fezes e excretas dos peixes. Estudos sobre os impactos causados por essa atividade podem fornecer dados para uma gestão ambiental que permita otimizar o uso múltiplo dos recursos hídricos sem que haja maiores danos ao ambiente aquático. Este trabalho procurou fazer uma caracterização limnológica e uma avaliação do impacto da criação em tanques-rede de tilápia (Orechromis sp.) no córrego da Arribada (Bacia do Baixo-Tietê), que é represado pelo reservatório da Usina Hidrelétrica de Nova Avanhandava, no Rio Tietê, SP. A área destinada à piscicultura é de 4ha de espelho d’água e foi projetada para 200 tanques-rede com volume de 18m3 cada. Em sete pontos distribuídos estrategicamente na região onde foi instalado o sistema de cultivo foram analisados as seguintes variáveis: temperatura, concentração e saturação de oxigênio dissolvido, pH, transparência, e taxas de sedimentação de fósforo total, ortofosfato, nitrogênio amoniacal, nitrito, nitrato e material em suspensão por meio de câmaras de sedimentação. Os resultados mostraram mais padrões temporais que espaciais, com queda acentuada na concentração e saturação de oxigênio dissolvido e aumento nas taxas de sedimentação de fósforo total e nitrato. Apesar do impacto causado apresentar tendências preocupantes, concluiu-se que neste estudo de caso, a produção em tanques-rede é viável...
Water is used to multiple uses: water supply, irrigation, power generation, leisure, aquaculture, place of discharge of home and industrial wastes, etc. In aquaculture, cage fish farming releases a great amount of organic matter directly into the water body. This activity can accelerate the water eutrophication process due to the input of dissolved nutrients and suspended matter, mainly by diet wastes, feces and fish excreta. Studies about environmental impacts caused by this activity can provide a support for a better environmental management that allows the use of water resources without over degradation of the ecosystem. This work aimed to make a limnological characterization and evaluation of the environmental impact of cage culture of Tilapia (Oreochromis sp.) in the stream of Arribada (Tietê river basin - Brazil). This stream is partially impounded by the reservoir of the hydroelectric power station of Nova Avanhandava. The culture is placed in an area of 4ha and it is planned the installation of 200 cages of 18 m3 each one. Till December 2004, there were 180 cages, each one with 1500 to 1800kg of fish production per harvest period. Seven sampling points were strategic placed in the area where was installed the cage fish farming to analise temperature, concentration and saturation of dissolved oxigen, pH, depth and total phosphorus, ortophosfate, ammoniacal nitrogen, nitrite, nitrate and susppended matter sedimentation ratios. The results have shown more temporal then spacial patterns, with drops in concentration and saturation of dissolved oxigen in water and increase of total phosphorus and nitrate sedimentation ratios. Despite of the warning tendences, we concluded that in this study of case, the impact caused by the activity, the cage fish farming is possible, since some precautions shall be taken to avoid degradation of the water body.
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Woodman, Paul. "Controls on rift-climax sedimentation: impact of sediment sources, sea-level change and tectonics. Examples from the Gulf of Suez Rift, Egypt." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509396.

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Alves, Rachel Cristina Prehl. "Monitoramento de características físico-químicas da água e taxas de sedimentação de tripton no Córrego da Arribada (Baixo Tietê-SP) relacionadas à piscicultura em tanques-rede /." Jaboticabal : [s.n.], 2006. http://hdl.handle.net/11449/86702.

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Orientador: Ana Eliza Baccarin Leonardo
Banca: Abílio Lopes de Oliveira Neto
Banca: Antonio Fernando Monteiro Camargo
Resumo: A água é usada para os mais variados fins: abastecimento, irrigação, geração de energia elétrica, lazer, aqüicultura, local de despejo de efluentes domésticos e industriais, etc. No caso da aqüicultura, a criação em tanques-rede introduz diretamente no corpo d'água uma grande quantidade de matéria orgânica. Essa atividade pode contribuir para acelerar os processos de eutrofização do meio devido aos aportes de nutrientes e material em suspensão provenientes, principalmente, do excedente de alimento, fezes e excretas dos peixes. Estudos sobre os impactos causados por essa atividade podem fornecer dados para uma gestão ambiental que permita otimizar o uso múltiplo dos recursos hídricos sem que haja maiores danos ao ambiente aquático. Este trabalho procurou fazer uma caracterização limnológica e uma avaliação do impacto da criação em tanques-rede de tilápia (Orechromis sp.) no córrego da Arribada (Bacia do Baixo-Tietê), que é represado pelo reservatório da Usina Hidrelétrica de Nova Avanhandava, no Rio Tietê, SP. A área destinada à piscicultura é de 4ha de espelho d'água e foi projetada para 200 tanques-rede com volume de 18m3 cada. Em sete pontos distribuídos estrategicamente na região onde foi instalado o sistema de cultivo foram analisados as seguintes variáveis: temperatura, concentração e saturação de oxigênio dissolvido, pH, transparência, e taxas de sedimentação de fósforo total, ortofosfato, nitrogênio amoniacal, nitrito, nitrato e material em suspensão por meio de câmaras de sedimentação. Os resultados mostraram mais padrões temporais que espaciais, com queda acentuada na concentração e saturação de oxigênio dissolvido e aumento nas taxas de sedimentação de fósforo total e nitrato. Apesar do impacto causado apresentar tendências preocupantes, concluiu-se que neste estudo de caso, a produção em tanques-rede é viável ...(Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Water is used to multiple uses: water supply, irrigation, power generation, leisure, aquaculture, place of discharge of home and industrial wastes, etc. In aquaculture, cage fish farming releases a great amount of organic matter directly into the water body. This activity can accelerate the water eutrophication process due to the input of dissolved nutrients and suspended matter, mainly by diet wastes, feces and fish excreta. Studies about environmental impacts caused by this activity can provide a support for a better environmental management that allows the use of water resources without over degradation of the ecosystem. This work aimed to make a limnological characterization and evaluation of the environmental impact of cage culture of Tilapia (Oreochromis sp.) in the stream of Arribada (Tietê river basin - Brazil). This stream is partially impounded by the reservoir of the hydroelectric power station of Nova Avanhandava. The culture is placed in an area of 4ha and it is planned the installation of 200 cages of 18 m3 each one. Till December 2004, there were 180 cages, each one with 1500 to 1800kg of fish production per harvest period. Seven sampling points were strategic placed in the area where was installed the cage fish farming to analise temperature, concentration and saturation of dissolved oxigen, pH, depth and total phosphorus, ortophosfate, ammoniacal nitrogen, nitrite, nitrate and susppended matter sedimentation ratios. The results have shown more temporal then spacial patterns, with drops in concentration and saturation of dissolved oxigen in water and increase of total phosphorus and nitrate sedimentation ratios. Despite of the warning tendences, we concluded that in this study of case, the impact caused by the activity, the cage fish farming is possible, since some precautions shall be taken to avoid degradation of the water body.
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Books on the topic "Impact sedimentation"

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Reservoir sedimentation: Impact, extent, and mitigation. Washington, D.C: World Bank, 1987.

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Varshney, R. S. Impact of siltation on the useful life of large reservoirs. Roorkee, India: INCOH Secretariat, 1997.

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Copeland, Ronald R. Sediment impact assessment, Manitou Springs, Colorado. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1995.

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Geptner, A. R. Volcanism impact on sedimentation on land and shelf of Kamchatka A.R. Geptner, N.P. Kuralenko, T.S. Kraevaya. Moscow: [s.n.], 1993.

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Heiskanen, Anna-Stiina. Sedimentation and recycling in aquatic ecosystems: The impact of pelagic processes and planktonic food web structure. Helsinki: Finnish Environment Institute, 1999.

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Sediment dynamics in the Rhine catchment: Quantification of fluvial response to climate change and human impact. Utrecht: Koninklijk Nederlands Aardrijkskundig Genootschap, 2009.

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L, Thomas R., ed. Ecological effects of in-situ sediment contaminants: Proceedings of an international workshop, held in Aberystwyth, Wales, 1984. Dordrecht: Dr. W. Junk, 1987.

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Chonguiça, Ebenizário. Environmental impact assessment of the Pequenos Libombos Dam in Southern Mozambique: An evaluation of methods for terrain analysis, sediment transport and reservoir sedimentation in an EIA framework. Uppsala: Uppsala University Institute of Earth Sciences, 1995.

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D'Anglejan, Bruno. Potential sedimentological impacts of hydro-electric developments in James Bay and Hudson Bay. Montréal: North Wind Information Services, 1994.

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Human impact on erosion and sedimentation. Wallingford, Oxfordshire, UK: IAHS, 1997.

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Book chapters on the topic "Impact sedimentation"

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Dypvik, Henning, Morten Smelror, Atle Mørk, Stephanie C. Werner, and Trond H. Torsvik. "Impact Cratering and Post-impact Sedimentation." In The Mjølnir Impact Event and its Consequences, 139–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-88260-2_5.

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Wardrop, Denice H., and Robert P. Brooks. "The Occurrence and Impact of Sedimentation in Central Pennsylvania Wetlands." In Monitoring Ecological Condition at Regional Scales, 119–30. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4976-1_9.

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Di Leo, Antonella, Santina Giandomenico, Lucia Spada, Nicola Cardellicchio, Francesco Paolo Buonocunto, Eliana Esposito, Luciana Ferraro, Laura Giordano, Alfonsa Milia, and Crescenzo Violante. "The offshore environmental impact by Sarno river in Naples bay (South-West Italy)." In Proceedings e report, 392–401. Florence: Firenze University Press, 2020. http://dx.doi.org/10.36253/978-88-5518-147-1.39.

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The goal of this work has been to establish the influence of the Sarno river on the present sedimentation in the Naples bay continental shelf by evaluating organic matter contribution and pollution. Sediments samples were collected, by van Veen grab, in 71 stations located offshore the Sarno river between Vesuvian and Sorrento Peninsula coasts. The characteristics of the surface sediments were analysed to highlight spatial trends in the (i) granulometry (grain-size); (ii) total nitrogen, organic carbon and total phosphorus; (iii) metal content (Hg, Cd, Pb, As, Cr, Cu, Ni, Zn, Fe and Mn).
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Saber, Mohamed, Sameh A. Kantoush, Tetsuya Sumi, Yusuke Ogiso, Tahani Alharrasi, Takahiro Koshiba, Mohammed Abdel-Fattah, et al. "Integrated Study of Flash Floods in Wadi Basins Considering Sedimentation and Climate Change: An International Collaboration Project." In Natural Disaster Science and Mitigation Engineering: DPRI reports, 401–22. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2904-4_15.

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AbstractRecently, Wadi flash floods (WFFs) have happened frequently in arid environments, resulting in great damage the society and the environment. In Oman, severe WFFs have occurred repeatedly within the last 10 years causing a huge impact on human lives and properties. This paper aims at introducing the framework of an international collaboration project between Japan and Oman for WFF management considering sediment dynamics and climate changes. Four research groups were established: climate change (G1), rainfall-runoff modeling (G2), sediment yield and transport (G3), and sedimentation and infiltration processes (G4). Several field investigations were conducted since 2017 until now. The detailed field survey to assess the deposited sediment in a dry reservoir by using sediment bars, and infiltration test, as well as drone survey were addressed. Some of the preliminary results and findings from the field investigation is discussed. The results show there is an adverse impact of sedimentation clogging on the infiltration process at the reservoirs. Based on the historical rainfall data analysis, there is a systematic increasing trend of the annual average precipitation with remarkable cycles over the MENA region and Oman. The knowledge obtained from this project is expected to be valuable to understanding sediment dynamics at Wadi basins.
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Ellouz-Zimmermann, N., E. Deville, C. Müller, S. Lallemant, A. B. Subhani, and A. R. Tabreez. "Impact of Sedimentation on Convergent Margin Tectonics: Example of the Makran Accretionary Prism (Pakistan)." In Thrust Belts and Foreland Basins, 327–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-69426-7_17.

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Iqra, Nazeat Ameen, Mohammad Asad Hussain, and M. Shah Alam Khan. "Impact of Coriolis Force on the Flow Field and Sedimentation in Ideally Shaped Tidal Basins." In Water Management: A View from Multidisciplinary Perspectives, 213–30. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95722-3_11.

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Patruno, Stefano, and William Reid. "Impact of Activation of a Syn-Depositional Normal Fault on Sedimentation in Greater Mid North Sea High." In Atlas of Structural Geological Interpretation from Seismic Images, 77–81. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119158332.ch14.

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Gruijs da Silva, Lara A., and Dorothee Dormann. "Sedimentation Assays to Assess the Impact of Posttranslational Modifications on Phase Separation of RNA-Binding Proteins In Vitro and In Cells." In Methods in Molecular Biology, 325–39. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2663-4_16.

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de Araújo, José Carlos, Lia Fernandes, José Christiano Machado Júnior, Márcia Regina Lima Oliveira, and Tácito Cunha Sousa. "Sedimentation of Reservoirs in Semiarid Brazil." In Global Change and Regional Impacts, 205–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55659-3_16.

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Chen, Xiaohua, Qixiu Pang, Mengnan Li, Baojiang Sun, Ruibo Zhang, Shiru Jia, and Peipei Han. "The Application of Microbial Technology in Harbor Engineering: The Impact of Extracellular Polymeric Substances on the Sedimentation and Properties of Fluid Mud." In Lecture Notes in Electrical Engineering, 847–57. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4801-2_88.

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Conference papers on the topic "Impact sedimentation"

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McIntosh, Nicholas, Jennifer Drake, Dean Young, and Jason Spencer. "Modeling Sedimentation in Underground Stormwater Detention Chamber Systems." In International Low Impact Development 2015. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479025.005.

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Burt, Donald M., and L. Paul Knauth. "HOW COMMON WAS IMPACT SEDIMENTATION ON EARLY MARS?" In Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-314212.

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Burt, Donald M. "PROBLEMS WITH TERRESTRIAL ANALOGS FOR IMPACT SEDIMENTATION ON MARS." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-350791.

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Kudamanov, A. I., S. E. Agalakov, M. J. Novoselova, T. V. Glukhov, T. M. Karikh, and V. A. Marinov. "Tectonics Impact on Sedimentation Process of Western Siberian Upper Cretaceous Deposits." In Tyumen 2021. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202150075.

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Whalen, Michael T., Timothy Bralower, Sean S. P. Gulick, Joanna V. Morgan, Christopher M. Lowery, Francisco Rodríguez-Tovar, and Science Party Members IODP Expedition 364. "SEDIMENTOLOGIC AND STABLE ISOTOPIC EVIDENCE FOR RAPID POST-IMPACT SEDIMENTATION IN THE CHICXULUB IMPACT CRATER." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-299302.

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M. Hussein, Ahmed, Dhiaa Neama Jabbar, and Shereen Qasim Abdulridha. "Impact of primary sedimentation tank on wastewater treatment plant units using computer simulation program." In The 6th International Conference of Biotechnology, Environment and Engineering Sciences. SRO media, 2019. http://dx.doi.org/10.46617/icbe6003.

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Chen, Qi, Run Hu, Yiman Wang, Huai Zheng, and Xiaobing Luo. "A Method to Eliminate the Effect of Phosphor Sedimentation on LED’s Angular Color Uniformity." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48023.

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Phosphor sedimentation has a great impact on the LED’s correlated color temperature (CCT) and the angular color uniformity (ACU). But fewer solutions have been proposed to overcome this effect. In this paper, we analysed the fundamental mechanism behind the phosphor sedimentation effect on LED’s ACU and proposed a simple structure to eliminate the effect. Monte Carlo ray-tracing simulations were conducted to validate the idea. The results show that the maximum CCT deviation with the proposed structure is within 100 K while that of the conventional one is as high as 680 K, and the ACU increases from 0.8811 to 0.9809 by 11.33%. It is concluded that this proposed structure has potential to be used to eliminate the phosphor sedimentation effect.
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Chen, Jun Yan, Pu Zhen Gao, Hai Feng Gu, and Hui Yu Yu. "Effects of Aggregation on Gravity Settlement of Submicron Aerosols Under High Temperature and High Humidity Conditions." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-92065.

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Abstract Coupling aerosol gravity sedimentation mechanism and aggregation effect, considering the correction of submicron particle free path and gas dynamic viscosity in thermal environment, a gravitational sedimentation model suitable for submicron aerosol accompanied by coalescence effect under high temperature and high humidity conditions is established, and the established model is verified by the results of thermal experiments. The aerosol aggregation model is established using the discretization method. By controlling whether the aggregation mechanism occurs in the established model, the influence of aggregation on gravitational settling when steam fraction and ambient pressure are changed is studied. In the study, it was found that the aggregation effect has a nearly 1-fold acceleration effect on the decay constant of the number concentration of submicron aerosols during gravitational sedimentation, and the acceleration effect on the decay constant of the mass concentration can be ignored, but there is an acceleration trend. When submicron aerosols settle under high temperature and high humidity conditions, the number median particle size tends to increase, that is, the increase of the number median particle size by the aggregation effect is greater than the decrease of the number median particle size by gravity sedimentation. After considering the aggregation effect, the number concentration decay constant and the mass concentration decay constant when the submicron aerosol undergoes gravitational sedimentation will decrease with the increase of the ambient pressure, and increase with the increase of the steam fraction. However, the number concentration decay constant changes larger, the mass concentration decay constant has a trend of change, and the change range is relatively weak. In addition, in the sensitivity analysis of the aerosol coalescence and gravitational sedimentation models, it is found that the molecular free path has a greater impact on the calculation results of aerosol coalescence and deposition in a thermal environment than the dynamic viscosity. Moreover, the influence of Brownian coalescence on the aerosol particle size spectrum is much greater than that caused by gravitational coalescence.
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Wang, Ruilin, Xinyu Wang, and Zeming Shi. "Impact of Mining Activities and Urbanization on the Sedimentation Rate of Anning River in the Panxi Rift, Southwestern China." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2754.

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Kuznetsov, Andrey, Andrey Kuznetsov, Yury Fedorov, Yury Fedorov, Paul Fattal, and Paul Fattal. "CHRONOLOGY OF CONTEMPORARY SEDIMENTATION AND POLLUTANTS ACCUMULATION IN THE BOTTOM SEDIMENTS OF THE SEA OF AZOV." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93832aa160.22680750.

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Bottom sediments formed in the water bodies under the technogenic impact are important environmental factors affecting water quality and hydrobiota. Usually they consist of natural and technogenic material and differ from natural formations by their morphology, chemical and lithological composition, physicochemical and biochemical properties. In the present paper we use the term “sediment layer of anthropogenic impact” to define the sediment layer containing technogenic material and/or chemical pollutants. The determination of its location in the sediment cores, its thickness and accumulation chronology is an important scientific problem. In the paper the results of layer by layer study of Cs-137, Am-241, Pb-210 specific activities as well as concentrations of petroleum components, lead and mercury in 48 sediment cores of the Sea of Azov and the Don River are examined. The sediment core layers are dated by radiological methods. In all the sediment cores the peak of Cs-137 specific activity related to the Chernobyl accident was detected. In the Sea of Azov, this peak is located in the upper sediment layer up to 10 cm thick, however, in the delta and in the near-delta part of the Don River, where the sedimentation rates are more important, it is found at 20 to 40 cm depth. Also in certain sediment cores the second peak of Cs-137 related to the global nuclear fallout of the 1960s was found. The most of petroleum components, lead and mercury quantities are concentrated in the upper sediment layer formed in the last 50 to 70 years, i.e. in the period of the most important anthropogenic pressure. So, this complex approach based on the data on the vertical distribution of technogenic radionuclides and common pollutants in the sediment cores made it possible to identify and delineate the sediment layer of high anthropogenic impact as well as to assess the duration of this impact.
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Reports on the topic "Impact sedimentation"

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Imran, Jasim, and Sadia Khan. Modeling the Impact of Extreme Events on Margin Sedimentation. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada441081.

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Imran, Jasim. Modeling the Impact of Extreme Events on Margin Sedimentation. Fort Belvoir, VA: Defense Technical Information Center, September 2004. http://dx.doi.org/10.21236/ada613075.

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Syvitski, James P., and Jasim Imran. Modeling the Effect of Climatic and Human Impacts on Margin Sedimentation. Fort Belvoir, VA: Defense Technical Information Center, September 2002. http://dx.doi.org/10.21236/ada627736.

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Imran, Jasim. Modeling the Effect of Climatic and Human Impacts on Margin Sedimentation. Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada629713.

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Leech, James. Technical assessment of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers : Red and Atchafalaya Rivers AdH model. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/45165.

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The Red River, Atchafalaya River, and the Old River Control Complex (ORCC) Outflow Channel Adaptive Hydraulics two-dimensional depth averaged sediment model (AdH-2D-SED) was used to evaluate the short-term and system-wide sedimentation effects of modifying the operation schedule at ORCC. The changes evaluated were increasing and decreasing the percentage of flow that is diverted to the Atchafalaya River from the Mississippi River at the ORCC and modifying the distributions through four ORCC structures. Sedimentation effects for several operation scenarios were compared to a Base condition for each water year that represented the existing operation protocols. Four dredging scenarios were developed and analyzed. Additionally, two structure options were developed and analyzed. The scenario analyses presented in this report are intended to identify large trends and to make gross assessments of the potential impacts of various proposed operational changes to the ORCC.
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Wilkens, Justin, and Burton Suedel. A method for simulating sedimentation of fish eggs to generate biological effects data for assessing dredging impacts. Environmental Laboratory (U.S.), March 2017. http://dx.doi.org/10.21079/11681/21635.

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Schmidt, Mark. Dynamics and variability of POC burial in depocenters of the North Sea (Skagerrak), Cruise No. AL561, 2.08.2021 – 13.08.2021, Kiel – Kiel, APOC. GEOMAR Helmholtz Centre for Ocean Research Kiel, 2021. http://dx.doi.org/10.3289/cr_al561.

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The AL561 cruise was conducted in the framework of the project APOC (“Anthropogenic impacts on Particulate Organic Carbon cycling in the North Sea”). This collaborative project between GEOMAR, AWI, HEREON, UHH, and BUND is to understand how particulate organic carbon (POC) cycling contributes to carbon sequestration in the North Sea and how this ecosystem service is compromised and interlinked with global change and a range of human pressures include fisheries (pelagic fisheries, bottom trawling), resource extraction (sand mining), sediment management (dredging and disposal of dredged sediments) and eutrophication. The main aim of the sampling activity during AL561 cruise was to recover undisturbed sediment from high accumulation sites in the Skagerrak/Kattegat and to subsample sediment/porewater at high resolution in order to investigate sedimentation transport processes, origin of sediment/POC and mineralization processes over the last 100- 200 years. Moreover, the actual processes of sedimentation and POC degradation in the water column and benthic layer will be addressed by sampling with CTD and Lander devices. In total 9 hydroacoustic surveys (59 profiles), 4 Gravity Corer, 7 Multicorer, 3 Lander and 4 CTD stations were successfully conducted during the AL561 cruise. - (Alkor-Berichte ; AL561)
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Perera, Duminda, Vladimir Smakhtin, Spencer Williams, Taylor North, and Allen Curry. Ageing Water Storage Infrastructure: An Emerging Global Risk. United Nations University Institute for Water, Environment and Health, January 2021. http://dx.doi.org/10.53328/qsyl1281.

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The Report provides an overview of the current state of knowledge on the ageing of large dams –an emerging global development issue as tens of thousands of existing large dams have reached or exceeded an “alert” age threshold of 50 years, and many others will soon approach 100 years. These aged structures incur rapidly rising maintenance needs and costs while simultaneously declining their effectiveness and posing potential threats to human safety and the environment. The Report analyzes large dam construction trends across major geographical regions and primary dam functions, such as water supply, irrigation, flood control, hydropower, and recreation. Analysis of existing global datasets indicates that despite plans in some regions and countries to build more water storage dams, particularly for hydropower generation, there will not be another “dam revolution” to match the scale of the high-intensity dam construction experienced in the early to middle, 20th century. At the same time, many of the large dams constructed then are aging, and hence we are already experiencing a “mass ageing” of water storage infrastructure. The Report further explores the emerging practice of decommissioning ageing dams, which can be removal or re-operation, to address issues of ensuring public safety, escalating maintenance costs, reservoir sedimentation, and restoration of a natural river ecosystem. Decommissioning becomes the option if economic and practical limitations prevent a dam from being upgraded or if its original use has become obsolete. The cost of dam removal is estimated to be an order of magnitude less than that of repairing. The Report also gives an overview of dam decommissioning’s socio-economic impacts, including those on local livelihoods, heritage, property value, recreation, and aesthetics. Notably, the nature of these impacts varies significantly between low- and high-income countries. The Report shows that while dam decommissioning is a relatively recent phenomenon, it is gaining pace in the USA and Europe, where many dams are older. However, it is primarily small dams that have been removed to date, and the decommissioning of large dams is still in its infancy, with only a few known cases in the last decade. A few case studies of ageing and decommissioned large dams illustrate the complexity and length of the process that is often necessary to orchestrate the dam removal safely. Even removing a small dam requires years (often decades), continuous expert and public involvement, and lengthy regulatory reviews. With the mass ageing of dams well underway, it is important to develop a framework of protocols that will guide and accelerate the process of dam removal. Overall, the Report aims to attract global attention to the creeping issue of ageing water storage infrastructure and stimulate international efforts to deal with this emerging water risk. This Report’s primary target audiences are governments and their partners responsible for planning and implementing water infrastructure development and management, emphasizing adaptat
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