Dissertations / Theses on the topic 'Impact sedimentation'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 41 dissertations / theses for your research on the topic 'Impact sedimentation.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
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.
Full textElleithy, 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.
Full text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
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.
Full textSmith, 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.
Full textHales, 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.
Full textLeMay, 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.
Full textBelete, 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.
Full textAlves, 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.
Full textCoordenação 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.
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.
Full textAlves, 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.
Full textBanca: 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.
Mestre
Pohlon, Elisabeth [Verfasser], Stefan [Akademischer Betreuer] Halle, Kirsten [Akademischer Betreuer] Küsel, and Roland [Akademischer Betreuer] Psenner. "Impact of the Flow Velocity and Sedimentation on Microbial Biofilms in the Stream Ilm (Thuringia/Germany) / Elisabeth Pohlon. Gutachter: Stefan Halle ; Kirsten Küsel ; Roland Psenner." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2014. http://d-nb.info/1046563408/34.
Full textXiao, Tangfu. "Environmental impact of thallium related to the mercury-thallium-gold mineralization in southwest Guizhou Province, China." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ65214.pdf.
Full textCibangu, Sylvain. "Mobile phones' contributions to socio-economic development according to Sen : corn growers' perceived impact in the Congo." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23013.
Full textStroope, Timothy Lister. "The impact of severe blowdown on sediment composition and sedimentation rates in lakes within blowdown patches created by the Routt-Divide Blowdown of 1997, Mt. Zirkel Wilderness Area, North-Central Colorado." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/2993.
Full textHughes, Andrew Owen Physical Environmental & Mathematical Sciences Australian Defence Force Academy UNSW. "An assessment of recent changes in catchment sediment sources and sinks, central Queensland, Australia." Awarded by:University of New South Wales - Australian Defence Force Academy. Physical, Environmental & Mathematical Sciences, 2009. http://handle.unsw.edu.au/1959.4/43622.
Full textBeauchamp, Axel. "Impact des aménagements hydrauliques sur les systèmes fluviaux bas-normands depuis 2000 ans : approche géomorphologique et géoarchéologique." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC024/document.
Full textIn Lower Normandy, knowledge of the hydrosedimentary dynamics of rivers before and during the installation of the numerous hydraulic installations since the Roman period remains very fragmentary. Little was known about the rates of erosion and sedimentation that have occurred over the last two millennia and how climatic and anthropogenic controls have influenced these processes. Thus, the challenge of this phD is to understand and measure the role of the inherited structures and operating in the current functioning of the rivers of Lower Normandy in order to help with their contemporary management. To provide answers, geomorphological and geoarchaeological researches has been carried out in several valleys. These studies make it possible to highlight the weight of the hydraulic installations and in particular the developments related to the mills in the setting up of floodplains. Indeed, the complete structuring and management of the watercourse since the Middle Ages artificialized riverbed forms and slopes, and partitioned rivers favoring lateral stability and overflow sedimentation in the floodplain conducting in the development of completely regulated rivers. The installation of mills is accompanied locally by a simplification of the river course. At the acme of the equipment there was a mill every 2,500 meters along the rivers of Lower Normandy. These transformations mean that a large part of current courses are artificial. These structures and the increase of the overbank silt sedimentation for 1000 years are at the origin of the establishment of a dynamic equilibrium resulting in the hydrosedimentary forms of the present rivers which are largely inherited. The abandonment of the management of the hydraulic structures and their destruction during the last fifty years comes to question this balance
Tobias, Lúcia da Conceição Nunes Santos Vieira. "Caracterização de aerossóis de Évora." Master's thesis, Universidade de Évora, 2013. http://hdl.handle.net/10174/10883.
Full textCHUTACHINDAKATE, CHADIN. "INTEGRATED SEDIMENT APPROACH AND IMPACTS OF CLIMATE CHANGE ON RESERVOIR SEDIMENTATION." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/85392.
Full textKyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第14934号
工博第3161号
新制||工||1474(附属図書館)
27372
UT51-2009-M848
京都大学大学院工学研究科社会基盤工学専攻
(主査)教授 角 哲也, 教授 田村 武, 教授 藤田 正治
学位規則第4条第1項該当
Van, der Walt Nicolene. "Investigation into the occurrence of the dinoflagellate, Ceratium hirundinella in source waters and the impact thereof on drinking water purification / van der Walt N." Thesis, North-West University, 2011. http://hdl.handle.net/10394/7292.
Full textThesis (M.Sc. (Environmental Science))--North-West University, Potchefstroom Campus, 2012.
Burdon, Francis John. "Impacts of sedimentation on the structure and functioning of agricultural stream communities." Thesis, University of Canterbury. School of Biological Sciences, 2013. http://hdl.handle.net/10092/8310.
Full textBernard, Aaron Michael. "Geospatial Modeling of Forest Road Networks and Their Effect on Stream Macroinvertebrate Communities." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/33338.
Full textMaster of Science
Mwaka, Beason Litungila. "Analysis of hydrological impacts due to sedimentation variability on alluvial stream-aquifer systems." Thesis, University of Newcastle Upon Tyne, 1994. http://hdl.handle.net/10443/1033.
Full textJohn, Chukwuemeka K., Jaan H. Pu, M. Pandey, and R. Moruzzi. "Impacts of sedimentation on rainwater quality: case study at Ikorodu of Lagos, Nigeria." IWA, 2021. http://hdl.handle.net/10454/18450.
Full textThis study investigated the impact of sedimentation on rainwater storage system using a case study at the Ikorodu area of Lagos state, a rural area in Nigeria. In this investigation, the proportions of Escherichia coli (E. coli) that were settleable (due to sedimentation) and those that were at the free phase have been studied. Water samples were collected from different depths in the inspected rainwater storage tank at two different periods (i.e. rainy and dry periods) for 20 days. The samples collected from these periods have been analysed for physical and microbial measures before passing it through the serial filters with pore sizes of 500 μm, 100 μm, 10 μm and 1.5 μm to measure the retained particle mass. From the results, it was observed that: (1) the water quality at the free-phase zone was better than that at the tank’s bottom; (2) the settleable bacteria rapidly sinked to bottom; (3) the correlation of turbidity, E. coli and total suspended solids (TSS) for all the rain events showed a relatively high Pearson’s coefficient of 0.9 to one another; and (4) over 70% of settling TSS occurred within first 36 hours. Finally, it has been found that the physical sedimentation process can significantly reduce the microbial measures.
Longing, Scott Douglas. "Ecological studies of benthic macroinvertebrates for determining sedimentation impacts in Chattahoochee National Forest streams." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27008.
Full textPh. D.
Lee, Richard Ting Cheung. "Sedimentary organic matter : implications for palaeoenvironments and human impacts on sedimentation in Hong Kong." HKBU Institutional Repository, 2003. http://repository.hkbu.edu.hk/etd_ra/514.
Full textHedrick, Lara B. "Evaluation of the impacts of highway construction on sediment and benthic macroinvertebrates in Appalachian streams." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5643.
Full textTitle from document title page. Document formatted into pages; contains xii, 162 p. : ill. (some col.), maps (some col.). Vita. Includes abstract. Includes bibliographical references.
Saal, Lauren B. "Rainfall impacts on suspended sediment concentrations in an urbanized tidal creek, southeastern North Carolina /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/saall/laurensaal.pdf.
Full textBrodbeck, Christian John McDonald Timothy P. Brown D. A. "Modeling water quality impacts of off-road vehicles in forested watersheds." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Summer/master's/BRODBECK_CHRISTIAN_16.pdf.
Full textParadis, Vilar Sarah. "Physical and Biogeochemical Impacts of Deep Bottom Trawling in Sedimentary Environments of the Western Mediterranean." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/670718.
Full textLa pesca de arrastre es considerada una de las actividades antrópicas más nocivas para el medio marino, debido a su extensión global, y la elevada frecuencia e intensidad. Puesto que este arte de pesca está en contacte continuo con el fondo marino, puede modificar la morfología del fondo y resuspender grandes volúmenes de sedimento, que pueden ser advectados, erosionando los caladeros y alterando las propiedades del sedimento. Con la expansión global de la pesca de arrastre a caladeros más profundos desde los años 1950, se estima que los impactos ocasionados por esta actividad pueden ser intensificados, pero todavía hay una falta de estudios. El objetivo de esta tesis era estudiar los impactos físicos y biogeoquímicos de la pesca de arrastre profunda en el margen occidental Mediterráneo. Los impactos físicos se estudiaron en los cañones submarinos catalanes mediante el análisis de más de 30 testimonios de sedimento de los flancos y ejes de los seis cañones más importantes de la costa. Este estudio observó que los caladeros, en los flancos de los cañones, estaban erosionados, y este sedimento es desplazado a los ejes de los cañones, duplicando y cuadriplicando los ritmos de sedimentación debido a la expansión de los caladeros a ambientes más profundos en los años 1960 y 1970. Este impacto sólo se observó en zonas próximas a los caladeros, y los ritmos de sedimentación inducidos por la pesca disminuyen a mayor distancia de los caladeros. Un segundo aumento en el ritmo de sedimentación fue identificado en uno de los cañones a principio de los 2000 debido a una modernización reciente de la flota de arrastre, resaltando la relación entre la tecnificación de la flota y las alteraciones en los regímenes sedimentarios. Estas alteraciones físicas en el fondo marino también modifican la biogeoquímica de los caladeros, disminuyendo su contenido de materia orgánica. En el Golfo de Castellammare (Sicilia), la acumulación de materia orgánica fresca y nutritiva en un caladero erosionado y empobrecido en nutrientes (20-60 % menos materia orgánica) estimuló la respuesta microbiana. A pesar de esto, la elevada frecuencia de los barcos de arrastre rápidamente erosiona este sedimento reciente, inhibiendo la recuperación de los caladeros del Golfo de Castellammare. Este hecho nos sugirió que épocas de veda podrían mitigar los impactos de la pesca de arrastre. No obstante, la comparación de testimonios de sedimento recuperados en diferentes épocas, incluyendo al final de una veda de 2 meses, en los caladeros del cañón de Palamós demostró que esta estrategia de gestión es insuficiente para mitigar los impactos de la pesca de arrastre. El contenido de materia orgánica en los caladeros estaba especialmente empobrecido en los compuestos más lábiles (52-70 % menor), perjudicando la preservación de materia orgánica en los sedimentos profundos y reduciendo la calidad nutritiva de los caladeros, lo cual podría tener impactos transcendentales en las comunidades bentónicas, incluyendo las especies comerciales. Estos impactos persistieron en todas las épocas de muestreo, incluso después de la veda, debido a los bajos ritmos de sedimentación en esta zona. Estos resultados resaltan la vulnerabilidad y baja resiliencia de ambientes profundos, y recalca que la pesca de arrastre profunda perjudica la integridad del fondo marino más allá de su capacidad de recuperación. Considerando la expansión global de los caladeros de pesca de arrastre, estos impactos podrían ocurrir en taludes continentales a escala global.
Bottom trawling is considered one of the most harmful anthropogenic activities in the marine environment given its widespread occurrence, high frequency, and intensity. Since bottom trawling gear are in continuous contact with the seafloor, it can modify seabed morphology by erasing natural sedimentary structures and resuspend large volumes of sediment, which can be advected from trawling grounds, eroding the seafloor and altering sediment properties. With the global expansion of bottom trawling to deeper fishing grounds since the mid-XXst century, it is expected that the impacts caused by this activity will be intensified, but studies assessing them are still scarce. The aim of this thesis was to study the physical and biogeochemical impacts of deep bottom trawling in the Western Mediterranean margin. The physical impact of bottom trawling in submarine canyons of the Catalan margin was studied through the analyses of over 30 sediment cores collected in canyon flanks and axes of six major submarine canyons incising the continental slope. This study observed that trawling grounds located along the canyon flanks are highly eroded, and this sediment is displaced towards the canyon axis, leading to a two- to four-fold increase in sedimentation rates in their axes since the expansion of bottom trawling grounds to deeper environments during the 1960s and 1970s. Trawling-enhanced sedimentation in these canyons are limited to areas located next to bottom trawling grounds, and trawling-derived sedimentation rates decrease towards the lower canyon axis with greater distance from bottom trawling grounds, leaving deeper areas unaffected. A second increase in sedimentation rates was observed in one of the canyons in the early XXIst century derived from the recent modernization of bottom trawling fleets, highlighting the clear interrelation between fleet technification and the modification of sedimentary regimes. These continuous physical alterations can also modify the biogeochemistry of deep bottom trawling grounds, depleting sedimentary organic matter. In the Gulf of Castellammare (Sícily), the accumulation of fresh and nutritionally rich organic matter in nutrient-deprived (20-60 % less organic matter) and eroded deep bottom trawling stimulated the microbial response, causing high turnover rates of labile organic matter. However, the high trawling frequency quickly erodes freshly-accumulated sediment, inhibiting the recovery of fishing grounds in the Gulf of Castellammare. This initially suggested that temporal trawling closures could mitigate the impacts of bottom trawling. However, the comparison of sediment cores collected during several seasons, including towards the end of a 2-month trawling closure in fishing grounds of Palamós Canyon revealed that this management strategy is insufficient to mitigate the impacts of bottom trawling. Organic matter in the trawled site was especially impoverished in the most labile biomarkers (52-70 % loss), hampering the preservation of organic matter in deep-sea sediments and diminishing the nutritional quality on trawling grounds, which could have transcendental impacts on benthic communities, including the targeted commercial species. These impacts persisted in every sampling season, even after the temporal trawling closure, since the low sedimentation rates of the area is not capable of restoring these fishing grounds. These results highlight the vulnerability and low resiliency of deep-sea environments, and stresses that deep-sea trawling damages the seafloor's integrity beyond repair. Considering the global expansion of bottom trawling grounds, these impacts could be occurring in trawled continental slopes worldwide.
Boun, Heng Mathias. "La sédimentation dans les lacs de barrage à Java, Indonésie : processus, rythmes et impacts." Thesis, Paris 1, 2013. http://www.theses.fr/2013PA010564/document.
Full textSince the Sixties, a large number of dams have been built in the Indonesian archipelago's main island, Java. Their rôle are multiple, going from liquid flows control (flood – peak shaving and low flow support) to water supply of great urban areas and agricultural lands. They also are an important energy supplier. After their watering, a fast filling of the tanks related to rates of erosion that appear among the highest in the world, has been observed. This significant efficiency decrease involves multiple negative impacts on environment and utilities. Through a multiple approach (GIS, remote sensing, hydroclimatic databases, lake surveys...), the objectives of this research are to determine the sedimentary transfer rates and pace within the studied basins, which act as erosion indicators in their respective basins. The key determinants affecting this high sedimentation will be highlighted and a software will be developed with the aim to provide Javanese river basins authorities with new tools
Núñez, Eustorgio Jaén. "Valoração econômica do serviço de redução de sedimentos das florestas da bacia hidrográfica do Canal do Panamá." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/11/11132/tde-02082011-102237/.
Full textSedimentation and siltation reduce the lakes depth and capacity to hold water in the Panama Canal, requiring periodic dredging which increases the operation costs. These processes are accelerated by the loss of forests that cover the basin. This studys objective is to estimate the economic value associated with reduction of sediments in the Canal basin, based on the method of avoided dredging cost. The physical effect of forest on sediment reduction was estimated through linear regression of biophysical data for seven watersheds that have measurements of sediments yield: Chagres, Pequení, Boquerón, Gatún, Trinidad, Cirí Grande and Caño Quebrado. These results shows that each hectare of forest in this area reduces the sediments in suspension. By adding sediments from the bottom of the riverbed, this corresponds to 14.32 m3.ha- 1.year-1 and to an economic value of USD 197.40 per hectare per year. It was concluded that forests contribute significantly to mitigate the process of siltation of lakes water storage for the operation of the Panama Canal, and this contribution may be valued at USD 39,640,091 per year for the entire basin forest.
Bron, Katherine Ann. "Impact Sedimentation of the Tookoonooka and Talundilly marine impact structures, Australia: an impact reservoir generated by cratering in a petroleum basin." Thesis, 2015. http://hdl.handle.net/2440/115482.
Full textThesis (Ph.D.) (Research by Publication) -- University of Adelaide, Australian School of Petroleum, 2015.
Stirling, David. "Mechanized clam harvesting for coastal British Columbia: environmental implications." Thesis, 2011. http://hdl.handle.net/1828/3774.
Full textGraduate
Lee, Andrew Thomas. "Dynamics of projectile impact in a granular material, and the dynamics of a single sedimenting sphere in fluid." Thesis, 2005. http://hdl.handle.net/2152/2259.
Full textChu, Wen-Hsiuan, and 朱雯軒. "Impacts of Sedimentation on Colloids and Radionuclide Transport." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/29620225037617218542.
Full textBrunner, Christopher Andreas. "Cumulative impacts of climate change, sedimentation and light attenuation on coral recruits." Thesis, 2022. https://researchonline.jcu.edu.au/76984/1/JCU_76984_Brunner_2022_thesis.pdf.
Full textSchiefer, Erik. "Natural patterns and land use impacts on lacustrine sedimentation in Northwestern British Columbia." Thesis, 1999. http://hdl.handle.net/2429/9766.
Full textTsai, Ming-Han, and 蔡明瀚. "Impacts of coagulation dosing modes on the floc formation and AOM removal by sedimentation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ezz286.
Full text國立交通大學
環境工程系所
107
Overdosing Al-based coagulants for treating low turbidity raw water has raised concerns about the excessive residual aluminum ions in treated water that could pose a threat to human health. In addition, clogging problem on the filter and the residual color of the treated water frequently occurred when FeCl3 is singly applied. In Taiwan, algogenic organic matter (AOM) in reservoir has always been a critical problem when it enters the treatment process. Intracellular organic matter (IOM) may release from the algal cell lysis during pre-chlorination. The hydrophilicity, low molecular weight (MW) and the protein-like substances of IOM could form soluble complexes with the coagulant and decrease the destabilization performance during the coagulation process. Therefore, this study aimed to clarify mechanism and the performance of IOM removal by different dosing modes including single dosing (e.g., FeCl3 and Alum) and sequence dosing (e.g., Alum→FeCl3 and FeCl3→Alum) under variation of pH. During the jar test, FlocCAM was installed on the jar to monitor the characteristics of floc. Supernatant was sampled for the analysis of dissolved organic carbon (DOC) to evaluate the separation performance of the IOM components by different dosing modes. The results showed that the optimal pH for FeCl3, Alum and sequence dosing (Alum→FeCl3 and FeCl3→Alum) was at 5.0, 5.5 and 6.0-6.5, respectively. Particularly, sequence dosing (55% for both A-F and F-A) showed its advantage over single dosing (48% and 38% for FeCl3 and Alum, respectively) in DOC removal at pH 6.0-6.5 (neutral-acidic pH). The removal of EEM component and the result of MW distribution demonstrated that the removal of large MW aromatic protein-like substances was positively correlated to the DOC removal for all dosing modes. The floc diameter at different pH region also revealed a similar trend with the DOC removal for all dosing modes. In addition, the change of pH during the coagulation process proved that the dominated mechanism for single dosing is complexation and adsorption at acidic (pH 5.0-5.5) and neutral-basic pH region, respectively. However, adsorption becomes the major coagulation mechanism for sequence dosing within the whole pH range (5.0-7.5). Therefore, it is recommended to be applied and operated at neutral-acidic pH for improvement of removing IOM.
Lachuta, Lisa. "Use of chlorine dioxide for biofilm control in sedimentation basins and impacts on treatment processes." 2004. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=81009&T=F.
Full textBenham, Claudia. "Understanding and governing the social-ecological impacts of industrial development in the coastal zone: A transdisciplinary case study analysis of Liquefied Natural Gas development in the Great Barrier Reef World Heritage Area." Phd thesis, 2016. http://hdl.handle.net/1885/118269.
Full textKhanghahi, Houshang Farabi. "A risk-based approach to control of water quality impacts caused by forest road systems." Phd thesis, 2005. http://hdl.handle.net/1885/151699.
Full text