Dissertations / Theses on the topic 'Siltation'
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Tolouie, Esmaiel. "Reservoir sedimentation and de-siltation." Thesis, University of Birmingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551025.
Full textVelasco, Victor V. "Evaluation and cost comparison of anti-siltation systems and traditional dredging methods." Springfield, Va. : Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA387800.
Full textWhite, James. "The use of sediment traps to monitor marina siltation with particular reference to Port Hamble Marina." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277497.
Full textSoetanto, Budi, and soetanto@gmail com. "EVALUATION OF SEDIMENTATION PROCESSES IN A COASTAL LAKE: CAUSEWAY LAKE, THE CAPRICORN COAST CASE STUDY." Central Queensland University. Engineering, 2007. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20070622.122252.
Full textCamargo, André Aukar Britschgy de. "Avaliação e quantificação da contribuição de uma voçoroca para o assoreamento do Ribeirão das Cruzes, tributário da represa de Três Irmãos, SP." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-10092012-110206/.
Full textDue the difficulty of modeling the contribution of sediment delivery from linear erosions in a watershed, these are often overlooked in hydrosedimentological studies, however, may represent a significant portion of siltation. This project analyzes the contribution of a gully erosion in Santo Antonio do Aracanguá (SP) for the sedimentation of Ribeirão das Cruzes, a tributary of the UHE Three Brothers reservoir (Tietê River). The study was conducted from theoretical research (bibliographic research), data collection in the study area and through computer simulation. With the aid of GIS tools were quantified the silted volume in the tributary, determined by bathymetric survey (12.31 hm³) and the volume of eroded soil in the gully erosion by topography surveying (0.22 hm³). Comparing these results, we have obtained the contribution of 1.80% from linear erosion to the sedimentation in the tributary during the 21.12 years preceding the survey. However, due to estimative of the beginning and development of the gully erosion being associated with the last 7.11 years, the contribution to sedimentation in this period was 5.17%. The study also accused the deposit of sediment in the first 2 km downstream interface \"erosion-dam\". Linear erosions can contribute significantly in the process of sedimentation as shown in the study case, being necessary to consider this type of contribution in studies of sediment input into water bodies.
Thompson, Adam. "Walleye Habitat Use, Spawning Behavior, and Egg Deposition in Sandusky Bay, Lake Erie." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1253639267.
Full textColagiovanni, Alessandro. "Assessment of the resilience of coral reefs to natural and human disturbances by means of recruitment panels in Indo-Pacific." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/9767/.
Full textWermuth, James A. "DETERMINING FACTORS THAT CONTRIBUTE TO NONPOINT SOURCE POLLUTION IN THE LOWER KENTUCKY WATERSHED." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/440.
Full textBrito, Geanne Moreira. "Determinação do assoreamento do reservatório da PCH Cachoeirão." Universidade Federal de Viçosa, 2013. http://locus.ufv.br/handle/123456789/3813.
Full textCompanhia Energética de Minas Gerais
All reservoirs formed by dams are subject to the process of sedimentation. Sediment accumulation reduces reservoir s useful volume and causes modifications in its elevation x area x volume (EAV) curves, which must be periodically updated. In this context, this study aims to evaluate the siltation process in SHP (Small Hydropower Plant) Cachoeirão reservoir and to update its operational data. The methodology consisted of comparing the results obtained before and after the reservoir filling, using Digital Elevation Model (DEM) and the fuction TIN (Triangulated irregular network), allowing to generate the EAV curves and to identify the total volumes of sediment deposited in the reservoir and the sediment level in the water intake. From this comparison, it was determined that, during 13 years of operation, the volume of sediment deposited on Cachoeirão s lake was equal to 0.866 hm3. This value represents a reduction of 15.9% in the original storage capacity of the reservoir. The softwares Sediment and Dposit were also used to assess the siltation process in SHP Cachoeirão and their results indicated an underestimation of the deposited sediments volume, in comparison to field results. The sediments accumulated at the bottom of the reservoir presented a variable grain size distribution, ranging from sand size observed in particles deposited closer to the start of backwater, until clay size, observed in particles deposited near to the dam axis. The study also concluded that the expected useful lifetime of the reservoir should not be achieved, unless preventive measures are taken to reduce the amount of sediment that enters the reservoir.
Reservatórios formados por barragens estão sujeitos ao processo de assoreamento. O acúmulo de sedimentos reduz o volume útil do reservatório e provoca alterações em suas curvas cota x área x volume (CAV), que devem ser atualizadas periodicamente. Nesse contexto, este estudo objetivou avaliar o processo de assoreamento no reservatório da PCH Cachoeirão e atualizar os seus dados operacionais. A metodologia empregada consistiu na comparação dos resultados obtidos antes e depois do enchimento do reservatório, com a utilização de Modelo Digital de Elevação (MDE) e função TIN (Triangulated irregular network), que possibilitou gerar as CAV, e identificar volumes de sedimentos totais e níveis de sedimentos na tomada d ́água. A partir dessa comparação, determinou-se que em 13 anos de operação o volume de sedimento depositado no lago da PCH Cachoeirão foi de 0,866 hm3. Esse valor representa uma redução de 15,9% na capacidade de armazenamento original do reservatório. Os softwares Sediment e Dposit também foram utilizados para avaliar o assoreamento da PCH Cachoeirão e seus resultados indicaram uma subestimativa do volume de sedimentos depositado, em relação aos resultados observados em campo. Os sedimentos acumulados no fundo do reservatório apresentaram distribuição granulométrica variável, desde partículas na fração areia, depositadas próximas ao início do remanso, até partículas na fração argila, depositadas próximas ao eixo da barragem. O estudo permitiu concluir que a vida útil esperada para o reservatório não deverá ser alcançada se medidas preventivas, que reduzam a quantidade de sedimentos que adentra o reservatório, não forem tomadas.
Cetinkaya, Oguz Kagan. "Management Of Reservoir Sedimentation Case Studies From Turkey." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607016/index.pdf.
Full textubuk I Dam, Bayindir Dam, ivriz Dam and Borç
ka Dam. Sediment measurements are made by governmental agencies in Turkey. In this study characteristics of these measurements will be presented for the future sediment related studies. Then sediment removal strategies which were used in RESCON will be introduced. Evaluation of RESCON results have been made and compared with previous studies for verification except Borç
ka Dam, since it is under construction.
Costa, Ivo Gilberto Duarte David da. "Análise do assoreamento no reservatório de Três Irmãos - SP, utilizando dados topobatimétricos, hidrológicos e técnicas de geoprocessamento." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-29092009-113504/.
Full textThe sedimentation process in reservoirs brings some consequences, among them, the cumulative impact on lacking of the storage capacity of those reservoirs. Depending on the uses of those reservoirs, they may lose their capability of flow regularization. Such effects not only affect one kind of economical activity that may exist upon these reservoirs. A considerable part of the economical model that is supported by those uses is also affected. The sedimentation is a process that can\'t be completely solved, unless the correct use of suitable techniques of management of the contribution basin of the reservoir can reduce the siltation. This research has its foundation on the collected information on the Três Irmãos hydroelectric power plant reservoir, consisting of topographic maps, rain monitoring checkpoints, satellite images and bathymetri campaigns on that reservoir. Thus, it was concluded that the reservoir has approximately 6,73% of its volume silted, and also has a annual average rate of siltation of 0,4%, below the brazilian and world average, 0,5% and 1%, respectively.
Reinwarth, Bastian [Verfasser], Jussi [Gutachter] Baade, Roland [Gutachter] Mäusbacher, and Hans-Rudolf [Gutachter] Bork. "Contemporary erosion rates in the Kruger National Park, South Africa, inferred from reservoir siltation surveys / Bastian Reinwarth ; Gutachter: Jussi Baade, Roland Mäusbacher, Hans-Rudolf Bork." Jena : Friedrich-Schiller-Universität Jena, 2020. http://d-nb.info/121521006X/34.
Full textOliveira, Ana Cristina Bastos de. "AvaliaÃÃo da qualidade das Ãguas do aÃude Santo AnastÃcio." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9997.
Full textO Brasil possui um grande volume de Ãgua doce, porÃm a RegiÃo Nordeste e o Estado do Cearà sofrem pela escassez deste recurso. Diante deste quadro muitos rios desta regiÃo foram barrados para a construÃÃo de reservatÃrios. Inserido neste contexto està o aÃude Santo AnastÃcio (ASA), objeto desta pesquisa, localizado em Fortaleza-CearÃ. O ASA està sofrendo progressivo processo de perda da qualidade e da profundidade de suas Ãguas, principalmente em funÃÃo das aÃÃes antrÃpicas. Assim, esse trabalho teve como objetivo diagnosticar a evoluÃÃo da perda dessa qualidade, por meio de anÃlises fÃsicas, quÃmicas e biolÃgicas, alÃm de calcular o Ãndice de qualidade das Ãguas (IQA) do aÃude, avaliar o nÃvel de eutrofizaÃÃo e de assoreamento e estudar a variabilidade espacial e temporal dos seus parÃmetros limnolÃgicos. Todos os mÃtodos de anÃlise utilizados foram baseados na 21 ediÃÃo do âStandard methods for the examination of water and waterwaste â APHA-AWWA-WPCFâ. De acordo com os resultados, pode-se concluir que alguns dos parÃmetros analisados, entre eles OD, fÃsforo total e DBO, estÃo em desacordo com os padrÃes estabelecidos para Ãgua doce, classe 3, pela ResoluÃÃo CONAMA n 357, na qual o ASA foi classificado, de acordo com seus usos preponderantes. Isto significa que esse corpo dâÃgua se encontra imprÃprio para as finalidades para as quais ele se destina atualmente. A avaliaÃÃo desse corpo hÃdrico apontou para baixa qualidade das suas Ãguas, segundo o cÃlculo do IQA, que oscila entre bom e ruim, com agravamento na qualidade no ponto 1, que à a regiÃo do aÃude prÃxima à comunidade que reside no seu entorno. Com relaÃÃo ao seu nÃvel de eutrofizaÃÃo, ele foi classificado como hipereutrÃfico, classificaÃÃo mais elevada no processo de envelhecimento artificial. Quanto à variaÃÃo temporal dos parÃmetros analisados, pode-se concluir que houve sazonalidade, com influÃncia do clima local. Esse fato foi observado por meio do estudo das correlaÃÃes entre os fatores climÃticos no teste de Tukey e ratificado pela anÃlise de componentes principais (PCA). Com relaÃÃo à variaÃÃo espacial, ela nÃo foi observada na maioria das variÃveis, com exceÃÃo do OD, que mostrou heterogeneidade no ponto 1, de acordo com o teste de Tukey.
Brazil has a large quantity of freshwater, but the Northeast Region and state of Cearà suffer scarcity of this resource. In function of this, many rivers were barred to build reservoirs. Within this context, there is the Santo AnastÃcio dam (ASA), the object of this research, located in Fortaleza-CearÃ. ASA is suffering progressive losses in the quality and depth of waters, mainly due to human actions. Thus, this study aimed to diagnose the evolution of this degradation by physical, chemical and biological analysis, as well as to calculate the water quality index (IQA) for ASA, to evaluate eutrophication and siltation levels and to study the spatial and temporal variability of their limnological parameters. All methods used here were based on the 21st edition of Standard methods for the examination of water and waterwaste - APHA-AWWA-WPCF. By the results, it was possible to conclude that some of the analysed parameters, including OD, total phosphorus and BOD, were evaluated against the established standards for freshwater, class 3, by âResoluÃÃo CONAMA nÂ357â, in which ASA was classified according to its predominant uses. This means that this reservoir is unfit for the purposes for which it is currently used. The results indicated a low quality of the waters, according to IQA, which oscillated between good and bad, with deterioration in quality, at the point 1, which is the region of ASA dam near the community that resides in its surroundings. About the level of eutrophication, it was classified as hypertrophic, higher ranking in artificial aging process. Regarding the temporal variation of the parameters, it can be concluded that there was seasonal, with the influence of local climate. This fact was observed by the study of correlations among the climatic factors using Tukeyâs test and ratified by Principal Component Analysis (PCA). In relation to spatial variation, it was not observed in most variables, except the OD, that exhibited heterogeneity at the point 1, according to Tukeyâs test.
Lopes, Josà Wellington Batista. "Hydrossedimentological modeling in semiarid meso-basin." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10890.
Full textPractical problems related to water resources and the need for resolution of these was what drove the hydrological modeling, since understanding of the hydrological behavior of the basin was needed. So, this research was conducted to assess, through hydrossedimentological modeling, the behavior of a semiarid meso scale watershed as well as its water availability. The study area was the Madalena Representative Basin, Federal State of CearÃ, with 124kmÂ. Rainfall, accumulated volume and sedimentation in two reservoirs were monitored. The WASA-SED (Model of Water Availability in Semi-Arid Environments Sediment Dynamics with Component) and VYELAS (Volume-Yield Elasticity) models were used in the evaluation. Some conclusions could be obtained from the results: i) Continuous monitoring of hydrological variables in watersheds of the Brazilian semiarid is necessary because the scarcity of data makes it difficult to analyze the performance of hydrological models, ii) Sedimentation measurements in reservoirs is essential for validating of sedimentological routines of model for evaluation of long periods, iii) The soil parameters are determinant in the quality of the results and details of the parameterization significantly improves the performance of the WASA model, iv) The predominance of drought scenario for the next years must affect water supply due to the low volume currently accumulated in the reservoir, v) Water availability of the strategic reservoir of the basin (Marengo reservoir) in extreme years of low rainfall, for 90% reliability yield,is 96% lower than the availability expected for regular years.
Problemas prÃticos relacionados aos recursos hÃdricos e a necessidade de resoluÃÃo desses foi o que impulsionou a modelagem hidrolÃgica, pois uma melhor compreensÃo do comportamento hidrolÃgico da bacia hidrogrÃfica se fez necessÃria. Assim esta pesquisa foi conduzida com o objetivo de avaliar, por meio da modelagem hidrossedimentolÃgica, o comportamento de uma bacia hidrogrÃfica de meso-escala no semiÃrido, assim como sua disponibilidade hÃdrica. A Ãrea foco do estudo foi a Bacia Representativa de Madalena, CearÃ, com 124kmÂ. Os modelos WASA-SED (Model of Water Availability in Semi-Arid Environments with Sediment Dynamics Component) e VYELAS (Volume-Yield Elasticity) foram utilizados na avaliaÃÃo. Algumas conclusÃes puderam ser constatadas a partir dos resultados obtidos: i) O monitoramento contÃnuo das variÃveis hidrolÃgicas em bacias hidrogrÃficas do semiÃrido se faz necessÃrio, pois a insuficiÃncia de dados dificulta a anÃlise do desempenho de modelos hidrolÃgicos; ii) A quantificaÃÃo do assoreamento em reservatÃrios à essencial para a validaÃÃo de rotinas sedimentolÃgicas do modelo para longos perÃodos de avaliaÃÃo; iii) Os parÃmetros do solo sÃo determinantes na qualidade dos resultados e o detalhamento da parametrizaÃÃo melhora sensivelmente o desempenho do modelo WASA; iv) O predomÃnio do cenÃrio de estiagem para os prÃximos anos compromete o abastecimento devido ao baixo volume acumulado atualmente no reservatÃrio; v) A disponibilidade hÃdrica do reservatÃrio estratÃgico da bacia (Marengo) em anos extremos de baixa pluviometria, para uma vazÃo com 90% de garantia, à 96% inferior à disponibilidade para os anos mÃdios.
Aras, Tuce. "Cost Anaysis Of Sediment Removal Techniques From Reservoir." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610585/index.pdf.
Full textplanning, design, construction, operation of dam until the accumulated sediment prevents its purpose function or functions. Unfortunately, effects of sedimentation and fate of the left over dams in the future are not figured. Indeed, these negative effects could be avoided, life of the reservoir can be prolonged and even the reservoir will last forever by minimizing the sedimentation. Therefore in this study, the methods that provide extension of reservoir life are discussed hydraulically, economically and applicability point of view. In addition, there is open source package program RESCON which examines and compares some sediment removal techniques economically and also hydraulically. RESCON is used in conjunction with several cases
namely Ç
ubuk Dam-I, Borç
ka Dam and Muratli Dam. Moreover, some sensitivity analyses are carried out in order to scrutiny of the program for Turkish economic conditions.
Teixeira, Josà JoÃo Lopes. "Hidrossedimentologia e disponibilidade hÃdrica da bacia hidrogrÃfica da Barragem de PoilÃo, Cabo Verde." Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6385.
Full textO ArquipÃlago de Cabo Verde, situado na costa ocidental africana, sofre influÃncia do deserto de Saara tornando o clima caracterizado por pluviometria muito baixa e distribuÃda irregularmente no espaÃo e no tempo. As chuvas sÃo muito concentradas, gerando grandes escoamentos para o mar. O aumento da disponibilidade hÃdrica requer alÃm da construÃÃo e manutenÃÃo de infraestrutura de captaÃÃo e conservaÃÃo de Ãguas pluviais, uma gestÃo eficiente destes recursos. Atualmente, constitui um dos eixos estratÃgicos da polÃtica do Estado de Cabo Verde, a captaÃÃo, o armazenamento e a mobilizaÃÃo de Ãguas superficiais atravÃs de construÃÃo de barragens. Estudos do comportamento hidrolÃgico e sedimentolÃgico do reservatÃrio e da sua bacia de contribuiÃÃo constituem premissas bÃsicas para adequados dimensionamento, gestÃo e monitoramento da referida infraestrutura. à nesse sentido que o presente estudo objetivou sistematizar informaÃÃes hidrolÃgicas e sedimentolÃgicas da bacia hidrogrÃfica da Barragem de PoilÃo (BP) e apresentou proposta operacional de longo prazo. A Ãrea de estudo ocupa 28 km da Bacia HidrogrÃfica da Ribeira Seca (BHRS) na Ilha de Santiago. A altitude da bacia varia de 99 m, situada na cota da barragem, atà 1394 m. Para o estudo, foram utilizados e sistematizados sÃrie pluviomÃtrica de 1973 a 2010, registros de vazÃo instantÃnea do perÃodo 1984 a 2000 e registros agroclimÃticos da Ãrea de estudo de 1981 a 2004. Para o preenchimento das falhas tanto dos escoamentos como da descarga sÃlida em suspensÃo, foi utilizado o mÃtodo de curva chave. Para estimativa de produÃÃo de sedimentos na bacia, aplicou-se a EquaÃÃo Universal de Perda de Solo (USLE) associada à razÃo de aporte de sedimentos (SDR). O Ãndice de retenÃÃo de sedimentos no reservatÃrio foi estimado pelo mÃtodo de Brune e a distribuiÃÃo de sedimento pelo mÃtodo empÃrico de reduÃÃo de Ãrea descrito por Borland e Miller e revisado por Lara. Para gerar e simular curvas de vazÃo versus garantia foi utilizado cÃdigo computacional VYELAS, desenvolvido por AraÃjo e baseado na abordagem de Campos. TambÃm foi avaliada uma possÃvel reduÃÃo da vazÃo de retirada do perÃodo 2006 a 2026, provocada pelo assoreamento do reservatÃrio. Concluiu-se que, em mÃdia, a precipitaÃÃo anual à de 323 mm, concentrando-se 73% nos meses de agosto e setembro; a bacia de contribuiÃÃo apresenta nÃmero de curva (CN) 76, com abstraÃÃo inicial (Ia) de 26 mm, coeficiente de escoamento de 19% e vazÃo anual afluente de 1,7 hm (Cv = 0,73); a disponibilidade hÃdrica para garantia de 85% à 0,548 hmÂ/ano e nÃo 0,671 hmÂ/ano, como indica o projeto original da barragem. Com uma descarga sÃlida avaliada em 22.185 mÂ/ano, estima-se que, atà o ano de 2026, a capacidade do reservatÃrio seja reduzida a uma taxa de 1,8 % ao ano, devido ao assoreamento, provocando uma reduÃÃo de 41% da disponibilidade hÃdrica inicial. Em 2026, segundo as estimativas dessa pesquisa, as perdas por evaporaÃÃo e sangria deverÃo ser da ordem de 81% da vazÃo afluente ao reservatÃrio. Na base desses resultados se apresentou proposta de operaÃÃo da Barragem de PoilÃo
Cape Verde Islands, located in the West African coast, are influenced by the Sahara desert, making the climate characterized by very low rainfall and great spatial and temporal variability. The rainfall events are highly concentrated generating large flows to the sea. The increase of water availability requires construction and maintenance of infrastructure to capture and conserve rainwater, and also an efficient management of these resources. Nowadays, capture, storage and mobilization of water surface through construction of dams is one of the strategic priorities of the policy of the State of Cape Verde. Studies of hydrology and sedimentology of the only existing reservoir (PoilÃo Dam, 1.2 hmÂ) and its watershed are the basic requirements for adequate design, management and monitoring of this infrastructure. In this sense, the present study aimed at systematizing hydrological and sediment information of the PoilÃo Dam and providing a long-term operational proposal. The altitude of the basin varies from 99 m, situated on the dam, up to 1394m. For the study, the following data were used and systematized: rainfall dataset from 1973 to 2010; records of instantaneous flow for the period of 1984 to 2000; and agro-climatic records from 1981 to 2004. To fill the gaps of both flow and suspended-sediment discharge, the rating-curve method was used. To estimate sediment yield in the watershed it was applied the Universal Soil Loss Equation (USLE), associated with the Sediment Delivery Ratio (SDR). The sediment release efficiency rate of the reservoir was estimated by Brune method and the sediment distribution inside the reservoir by the empirical area reduction method described by Borland and Miller, and reviewed by Lara. To assess water availability, water yield versus reliability curves were used. These curves were obtained by the computer code VYELAS, developed by AraÃjo and based on Campos approach. The reduction of the water yield (caused by the reservoir silting) within the period from 2006 to 2026 was also assessed. It was concluded that the average annual rainfall in the watershed is 323 mm, concentrating 73% in August and September; the watershed presents a number of curve (CN) of 76 with an initial abstraction (Ia) of 26 mm, the runoff coefficient is 19% and the average annual inflow is 1.7 hm (coefficient of variation 0.73); the water availability at 85% reliability level is estimated at 0.548 hmÂ/year and not 0.671 hmÂ/year as the original design indicates. With a sediment discharge estimated at 22,185 mÂ/year, it was concluded that, by the year 2026, the annual reservoir storage capacity reduction rate is 1.18% (due to siltation), causing a 41% reduction of the initial water availability. At that time, losses due to evaporation and spillway overflow totalize 81% of annual inflow. Based on these results, a PoilÃo reservoir operation proposal is presented
Kuwajima, Julio Issao. "Análise do modelo SWAT como ferramenta de prevenção e de estimativa de assoreamento no reservatório do Lobo (Itirapina/Brotas/SP)." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-14062013-112915/.
Full textThe sediment yield and erosion rates are directly affected by pedologic conditions, precipitation, land and use changes, management and soil preservation practices. Excessive sediment yield in a watershed could result in difficulties caused by siltation processes in rivers and reservoirs. Sediment deposition at the bottom of reservoirs and dams may result in volume loss. In time such loss could become impairment of water availability for irrigation, human consumption and power generation. Sediment dredging is an expensive solution that will address only the symptoms and not the causes of the issue. Therefore assessing the amount of sediment and their causes is required for Water Resources Management and Planning. The present research aims to evaluate the applicability of the SWAT (Soil and Water Assessment Tool) as sediment generation and contribution estimation tool for reservoirs evaluating the results, assessing the model strengths and weakness for the local contitions and make sugestions for future research and/or model modifications. Originally developed by the USDA (United States Department of agriculture) to assess erosion and water balance of watersheds, this model has a large number of users, available documentation and registered applications across the world. The study area, with an approximate area of 227 km² is the Lobo reservoir watershed, located at the municipalities of Itirapina and Brotas. The reservoir is currently used for hydropower generation and as a tourist attraction. Two simulation scenarios were chosen: Scenario 1from 1977 to 1985 and Scenario 2 from 1996 until 2006. To perform the simulations the ArcSWAT 2005 version 2.34 was selected and the SWAT-CUP 4.3.1 for the calibration. The data input was: daily precipitation and discharge flow datasets from ANA (Agência Nacional das Águas), pedological survey chats and land use charts obtained from CBERS and LANDSAT imagery. After calibration using SUFI2, sediment yield and contribution at the dam was obtained for both scenarios. The first scenario results showed negative effects caused by inconsistent input data flow and limitations regarding model discretization on the model representation of highly fragmented land use. The second scenario, however achieved satisfactory results demonstrating the model ability as sediment yield and contribution in reservoir evaluation tool.
Arantes, Diego Mendonça. "Deposição e exportação de sólidos e nutrientes na sub-bacia do Ribeirão das Cruzes, baixo Tietê (SP)." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-08112012-092936/.
Full textThe environmental quality of waterbody is the result of the situation of its drainage basin, so that the transformations that occur on the soils surrounding cause significant changes in the aquatic environment. Therefore, each time more has been increasing the works with the concept of integrated management of environments. Thus, the knowledge about the processes of generation, transport and deposition of sediments, because they are sources of solids, nutrients and contaminants to waterbody, is extremely important for the conservation, development and integrated management of water resources. In this way, this dissertation presents a study concerning the deposition and export of solids and nutrients in the Ribeirão das Cruzes sub-basin, in Santo Antônio do Aracanguá city, SP, in Baixo Tietê Water Resources Management Unit (WRMU - 19). This waterbody was divided into compartments and analyzed by transects, which are transverse axes to the flow, and experiments involving installation of sedimentation traps, collect of bottom sediments and flow measurements were carried out in two distinct hydrological periods: one in January during the rainy season, and another in August, during the dry season. The maximum suspended solids deposition rate were 62.40 g/m² day during the rainy season, and 37.29 g/m² day during the dry season. So, the average rate of nitrogen deposition were 0.53 and 2.02 g/m² day, and the rate of phosphorus were 139.67 and 103.89 mg/m² day, during the rainy and dry seasons, respectively. As for exportation rates, the average rates found of suspended solids were 725.96 and 2328.44 ton/day, the rates of nitrogen were 121.41 and 299.84 ton/day, the rates of phosphorus were 14.86 and 10.05 ton/day, during the rainy and dry seasons, respectively. The results obtained, when compared to other studies in similar environments, show high rates of solids and nutrients deposition and export, demonstrating, this way, the incidence of eutrophication processes and siltation of the water resources, as well as the expression of impacts from the landuse, able to influence the water quality.
Schmidt, Darlan Martínes. "Transporte de sedimentos no rio Coruripe e quantificação do seu empilhamento a partir do evento pluviométrico de junho/2009 no reservatório Coruripe I município de Coruripe AL." Universidade Federal de Alagoas, 2010. http://repositorio.ufal.br/handle/riufal/876.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
A pesquisa teve como objetivo avaliar o transporte no rio Coruripe e o empilhamento de sedimentos provindos de uma barragem que rompeu à montante do Reservatório Coruripe - I, mediante estudos da quantificação do transporte de sedimentos por arraste e em suspensão. O lago possui atualmente espelho d água de 373 ha, construído para demanda de água para irrigação em 2006. Situa-se na BH do Rio Coruripe, com área de 1.562 km². Pela batimetria, a profundidade do reservatório varia de 0,8 a 12,3 m, de montante à barragem. Para a quantificação dos sedimentos transportados em suspensão e rolamento foram coletadas amostras acima do reservatório e para os sedimentos de fundo foram coletados no interior do lago na mesma época do levantamento topo-batimétrico com amostrador draga tipo Ecman.As amostras de sedimentos em suspensão foram analisadas através da secagem total e posterior pesagem, as quais foram quantificadas proporcionalmente ao volume amostrado. Já com as amostras de fundo não foi possível determinar a granulometria por apresentarem homogeneidade na composição, contendo somente lodo. Estima-se que o volume inutilizado do lago em 3 anos de existência é de 59,12 %, com taxa média de sedimentos acumulados de aproximadamente 512.549,43 ton.ano-1. As áreas de maior assoreamento e eutrofização estão no sentido de jusante à montante por sedimentos oriundos de uma barragem rompida à montante e do rio que abastece o reservatório e das laterais para o centro, devido a sedimentos carreados pela erosão das áreas de encostas, as quais são cultivadas com cana-de-açúcar. Diante disso, não são mantidas as faixas de preservação ciliar, que atuariam como uma espécie de filtro, diminuindo essa contribuição direta. Estimou-se ainda que, se forem tomadas decisões urgentes para a contenção de sedimentos marginais, a vida útil deste reservatório pode se elevar para aproximadamente 85 anos. Caso contrário, se o atual nível de assoreamento continuar, a vida útil efetiva não ultrapassará 3 anos.
Sousa, Wanessa de. "Comunidades zooplanct?nicas como bioindicadoras da qualidade da ?gua de quatro reservat?rios da regi?o semi-?rida do Rio Grande do Norte." Universidade Federal do Rio Grande do Norte, 2007. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12514.
Full textCoordena??o de Aperfei?oamento de Pessoal de N?vel Superior
The response of zooplankton assemblages to variations in the water quality of four man-made lakes, caused by eutrophication and siltation, was investigated by means of canonical correspondence analysis. Monte Carlo simulations using the CCA eingenvalues as test statistics revealed that changes in zooplankton species composition along the environmental gradients of trophic state and abiogenic turbidity were highly significant. The species Brachionus calyciflorus, Thermocyclops sp. and Argyrodiaptomus sp. were good indicators of eutrophic conditions while the species Brachionus dolabratus, Keratella tropica and Hexarthra sp. were good indicators of high turbidity due to suspended sediments. The rotifer genus Brachionus was the most species-rich taxon, comprising five species which were associated with different environmental conditions. Therefore, we tested whether this genus alone could potentially be a better biological indicator of these environmental gradients than the entire zooplankton assemblages or any other random set of five species. The ordination results show that the five Brachionus species alone did not explain better the observed pattern of environmental variation than most random sets of five species. Therefore, this genus could not be selected as a target taxon for more intensive environmental monitoring as has been previously suggested by Attayde and Bozelli (1998). Overall, our results show that changes in the water quality of man-made lakes in a tropical semi-arid region have significant effects on the structure of zooplankton assemblages that can potentially affect the functioning of these ecosystems
As respostas das assembl?ias zooplanct?nicas ?s varia??es na qualidade da ?gua de quatro reservat?rios, causadas por eutrofiza??o e assoreamento, foram investigadas por meio de uma an?lise de correspond?ncia can?nica. Simula??es de Monte Carlo utilizando os autovalores da CCA como estat?sticas teste revelaram que as mudan?as na composi??o de esp?cies zooplanct?nicas ao longo dos gradientes ambientais de estado tr?fico e turbidez abiog?nica foram altamente significativas. As esp?cies Brachionus calyciflorus, Thermocyclops sp. e Argyrodiaptomus sp. foram boas indicadoras de condi??es eutr?ficas enquanto que as esp?cies Brachionus dolabratus, Keratella tropica e Hexarthra sp. foram boas indicadoras de elevada turbidez por sedimentos em suspens?o. O g?nero de rot?feros Brachionus foi o mais rico em esp?cies, compreendendo cinco esp?cies que estiveram associadas a diferentes condi??es ambientais. Portanto, n?s testamos se esse g?nero sozinho poderia ser potencialmente um melhor indicador biol?gico desses gradientes ambientais do que toda a assembl?ia zooplanct?nica ou qualquer outro conjunto aleat?rio de cinco esp?cies. Os resultados da ordena??o demonstram que as cinco esp?cies de Brachionus quando sozinhas n?o explicaram melhor os padr?es observados de varia??o ambiental que a maioria dos conjuntos aleat?rios de cinco esp?cies. Portanto, este g?nero n?o pode ser selecionado como um t?xon alvo para um monitoramento ambiental mais intensivo conforme previamente sugerido por Attayde e Bozelli (1998). De um modo geral, nossos resultados mostram que mudan?as na qualidade da ?gua de reservat?rios em uma regi?o semi-?rida tropical t?m efeitos significativos sobre a estrutura das assembl?ias zooplanct?nicas, os quais podem afetar potencialmente o funcionamento desses ecossistemas
Huguet, Jean-Rémy. "Dynamique hydro-sédimentaire en milieu portuaire : application au port de plaisance de La Rochelle." Thesis, La Rochelle, 2019. http://www.theses.fr/2019LAROS034.
Full textPorts are presents on all maritime and river fronts of the world, and represent major interfaces in the development of territories. The natural siltation of these calm areas can obstruct waterways and prevent these infrastructures from fulfilling their primary function as a shelter for boats. This often involves the implementation of expensive and time-consuming dredging operations to restore depths compatible with navigation. Les Minimes marina (La Rochelle, France), which is one of the largest marinas on the Atlantic coast, is not spared by this phenomenon and requires dredging activities for a large part of the year. In response to this problem, the marina and La Rochelle University, has wanted to understand better the natural environment and the processes leading to the accumulation of sediments in the marina. By combining an instrumental in situ approach with operational numerical modelling, the objective of this thesis was, therefore, to characterise the hydro-sedimentary dynamics of the area. Quantification of the impact of floating structures (boats, pontoons) on marina hydrodynamics was firstly carried out. The second field of study aimed to study the circulation of water masses and their renewal about the effect of wind and tide. The observations collected made it possible to study spatial and temporal sediment dynamics, under the action of wind, tide and waves. Thus, numerous siltation control measures have been implemented and analysed to provide solutions and research perspectives in view with siltation and dredging management
Mekerta, Belkacem. "Étude des propriétés géomécaniques des sédiments d'envasement de la retenue du barrage de Génissiat." Vandoeuvre-les-Nancy, INPL, 1995. http://docnum.univ-lorraine.fr/public/INPL_T_1995_MEKERTA_B.pdf.
Full textLin, Cho-Tian, and 林朝添. "A Study of Sediment Siltation at Wu-Shi Fishery Harbor." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ph8s7z.
Full text國立臺灣海洋大學
河海工程學系
107
The investigation on sedimentary deposition at Wushi fishing port receives great attention recently. In 2016, amount of sediment is accumulated at Wushi fishing port because of the continuous visits of three typhoons; the observations exhibit that a submerged sandbar is found nearby the southern part at Wushi fishing port, having a negative impact to navigation. The main objective of this study is to investigate the morphological migrations subject to the effects of construction histories as well as field water depths. The analyses suggest that the main source of sedimentation during the interaction of typhoon waves at fishing port is the sediment at southern of breakwater and the front part of To-Chen park; however, the main source of sedimentation during the seasonal waves at fishing port is the sediment at eastern of fishing port.
Velasco, Victor V. "Evalution and cost comparison of anti-siltation systems and traditional dredging methods." Thesis, 2000. http://hdl.handle.net/10945/7689.
Full textMaintaining the design depth of ship servicing facilities is a challenging task. Dredging technology has improved significantly in the past few decades and this should have driven the cost downwards. However, increased environmental awareness has placed limitations on how dredge spoils are handled, transported and disposed of and has effectively increased the costs of dredging operations. The United States Army Corps of Engineers and the Naval Facilities Engineering Command have conducted research into alternate sediment removal methods that may replace conventional dredging in sites where the conditions merit. The alternate systems include arrays of jets to prevent settling of suspended sediment and systems to entrain and transport sediment without physical removal. This study investigates the most promising techniques researched by the United States Army Corps of Engineers and the Naval Facilities Engineering Command for application at Naval Station Mayport, Florida. Naval Station Mayport has a long history of high sedimentation rates and difficulty in maintaining design depths at the piers, despite several studies to determine cost effective alternatives. Although several conservative assumptions were made concerning environmental conditions at the site that directly affect the design concept presented, the economic analysis indicated substantial saving can be realized if an alternate system consisting of turbo scouring units and a catchment basin were installed. The analysis takes into consideration the initial capital cost and the annual operation and maintenance of the alternate system for a 30-year life cycle, adjusted for inflation and compares the total cost against the cost to continue the current dredging operations at the existing frequency and quantities
謝鴻源. "GM (0, N) IN THE RESERVOIR CAPACITY ADD THE SILTATION OF STUDY." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/75726570072281307883.
Full text建國科技大學
電機工程系暨研究所
101
Taiwan due to the difference in time of rainfall, coupled with short rivers, steep and rapid stream, the rapid formation of rainfall runoff into the sea, so the reservoir water resources sustainable utilization of Taiwan's most stable and reliable foundation. Reservoir is an important reservoir in northern emerald, but earthquakes and typhoons heavy rain events, making the catchment surface erosion by rain, a lot of sediment collapse or erosion of storage, making it particularly serious siltation problem. Reservoir sedimentation problem has been studied for many years, is calculated reservoir sedimentation reservoir sedimentation and soil conservation project is an important part of its planning and forecasting results for Reservoir Reservoir is a must. Reservoir sedimentation basin is also on a variety of natural and human factors combined result, not only by rainfall (especially rain) temporal and spatial variation is also affected by a serious impact on river debris slide. Calculated on reservoir sedimentation previous research a variety of example: According to the results of reservoir sediment deposition only estimate the total reservoir and the process of change; After the law on reservoir sedimentation studies, various parameters derived direct calculation method and river power mathematical model. However, these studies bureau restricted bigger. However, a characteristic gray theory each data entry system, will produce different results, and different time course, it contains a variety of different data periods. In this paper, the gray system theory, the direct input of survey data from the system to the reservoir for the study of jade objects, changes in the reservoir siltation gray analysis and prediction of reservoir management to provide scientific basis for further control.
Kidd, IM. "Strategies for sustainable morphological remediation of the Tamar river estuary and other similarly degraded estuaries." Thesis, 2017. https://eprints.utas.edu.au/23855/1/Kidd_whole_thesis_ex_pub_mat.pdf.
Full textChang, Chien Chin Hsien, and 張簡進賢. "Influence of River Siltation on Groundwater Level—A Case Study of Dashu Reach of Kaoping River." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/h2ugrn.
Full text國立屏東科技大學
土木工程系所
102
Taiwan, due to its island properties and the addition influence of 921 Earthquake in 1999 and Typhoon- Morakot- caused flood (the 88 flood) in 2009, the hillsides are seriously loosen and collapsed, resulting in abundant of detritus sliding down to the rivers and silting up the river courses. The study on the relation between the height of siltation of the river course and the fluctuation of the groundwater level can be the reference to estimate the amount groundwater development when Kaoping River Dam is in the dry spell or has higher turbidity. The research takes the data of the cross section of Da Shu segment of Kaoping River from 2009 to 2013 along with the analysis and algorithm of neighboring groundwater monitoring wells to deduce the relation between river siltation and groundwater level. The analysis shows that during the period from 2009 to 2013, annual variation of elevation was 18.01, 18.75, 19.25, 19.53 and 19.40 meters separately; however, annual average groundwater level was 16.6, 16.74, 16.9, 17.24 and 16.7 meters separately. Based on the relation showed above, the conclusion can be made that the rising of river siltation may accompany with the increasing of groundwater level.
Lobo, Felipe de Lucia. "Spatial and Temporal Analysis of Water Siltation Caused by Artisanal Small-scale Gold Mining in the Tapajós Water Basin, Brazilian Amazon: An Optics and Remote Sensing Approach." Thesis, 2015. http://hdl.handle.net/1828/6324.
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lobo@uvic.ca
Hulec, Filip. "Hydrologický a plaveninový režim Odlezelského jezera." Master's thesis, 2020. http://www.nusl.cz/ntk/nusl-435874.
Full textStapper, Daniel. "Artisanal gold mining, mercury and sediment in Central Kalimantan, Indonesia." Thesis, 2011. http://hdl.handle.net/1828/3711.
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