Rozprawy doktorskie na temat „Lakes and reservoirs”
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Yeates, Peter Stafford. "Deep mixing in stratified lakes and reservoirs". University of Western Australia. Centre for Water Research, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0046.
Pełny tekst źródłaGipey, Collins D. "Manganese analysis and speciation in freshwater lakes and reservoirs /". [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16202.pdf.
Pełny tekst źródłaKoçyigit, Müsteyde Baduna. "Numerical modelling of wind-induced circulation in lakes and reservoirs". Thesis, Cardiff University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412516.
Pełny tekst źródłaBierlein, Kevin Andrew. "Predicting induced sediment oxygen flux in oxygenated lakes and reservoirs". Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/73502.
Pełny tekst źródłaPh. D.
Littlejohn, Carla Louise, i n/a. "Influence of Artificial Destratification on Limnological Processes in Lake Samsonvale (North Pine Dam), Queensland, Australia". Griffith University. Australian School of Environmental Studies, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050211.133123.
Pełny tekst źródłaDoubek, Jonathan Patrick. "The Effects of Hypoxia on Zooplankton Communities in Lakes and Reservoirs". Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83574.
Pełny tekst źródłaPh. D.
Morillo, Sebastian. "Engineering solutions to water quality problems in lakes". University of Western Australia. Centre for Water Research, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0153.
Pełny tekst źródłaWeisbrod, Barbara [Verfasser]. "Dynamics of toxic cyanobacteria in lakes and artificial water reservoirs / Barbara Weisbrod". Konstanz : KOPS Universität Konstanz, 2021. http://d-nb.info/1228271925/34.
Pełny tekst źródłaWilson, Helen M. "An evaluation of alternative management strategies for shallow eutrophicated lakes and reservoirs". Thesis, University of Plymouth, 1995. http://hdl.handle.net/10026.1/1870.
Pełny tekst źródłaGaraway, Caroline Jane. "Small waterbody fisheries and the potential for community-led enhancement : case studies in Lao PDR". Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/12552.
Pełny tekst źródłaThompson, Lisa C. "The influence of hydraulic retention time on planktonic biomass in lakes and reservoirs /". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56754.
Pełny tekst źródłaMehling, Molly Gail. "DEVELOPMENT AND APPLICATION OF A GEOSPATIAL DATABASE OF SIERRA NEVADA LAKES AND RESERVOIRS". Miami University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=miami1142529953.
Pełny tekst źródłaOlding, Daniel D. "Phytoplankton community composition in relation to environmental conditions in urban lakes, ponds and reservoirs". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0003/MQ40701.pdf.
Pełny tekst źródłaAllen, Jason D. "Correlating phytoplankton assemblages with water quality in Illinois lakes and reservoirs : validating models based on historical data /". View online, 2008. http://repository.eiu.edu/theses/docs/32211131464742.pdf.
Pełny tekst źródłaGorrie, Jason Robert. "An Examination Of Water Quality Impacts On Lake Manassas". Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/32815.
Pełny tekst źródłaMaster of Science
Crile, Patrick. "A Limnological Analysis of Lake Manassas, with an Updated Baseline Through 2010". Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19337.
Pełny tekst źródłaLake Manassas remains an enriched or eutrophic system, meaning the levels of nutrients and biomass production in lake waters is above desired standards. Nutrient loading occurs via a stream network with the largest contributor being Broad Run which is consistent with previous water quality studies.
The lake serves as the sole water source for nearly 40,000 residents and businesses and ensuring clean and safe water is of significant importance. Close monitoring in conjunction with the implementation of appropriate management practices within the watershed are necessary to prevent water quality from becoming significantly degraded.
Master of Science
John, V. Chandy. "Development and application of linked hydrodynamic-water quality models for small lakes, reservoirs, and tidal inlets". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ31528.pdf.
Pełny tekst źródłaBryant, Lee Davis. "Dynamic forcing of oxygen, iron, and manganese fluxes at the sediment-water interface in lakes and reservoirs". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77337.
Pełny tekst źródłaPh. D.
Abrahamse, Matthew S. "Abundance and structure of burbot Lota lota populations in lakes and reservoirs of the Wind River drainage, Wyoming". Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=1797714301&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Pełny tekst źródłaKrenz, Robert J. "Photopigments as descriptors of phytoplankton assemblages for biotic assessment of Illinois lakes and reservoirs : an HPLC aided analysis /". View online, 2009. http://repository.eiu.edu/theses/docs/32211131592143.pdf.
Pełny tekst źródłaMehling, Molly Gail. "Nearshore littoral benthic macroinvertebrates of lakes and reservoirs in the western US: Multiscale community patterns and implications for bioassessment". Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1312555319.
Pełny tekst źródłaResende, João Furtado. "Automated calibration of a Carbon dynamic model for lakes and reservoirs : (calibração automática de um modelo de dinâmica de Carbono em lagos e reservatórios)". reponame:Repositório Institucional da UFPR, 2017. http://hdl.handle.net/1884/49081.
Pełny tekst źródłaCoorientador : Cristóvão Vicente Scapulatempo Fernandes
Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Pós-Graduação em Engenharia de Recursos Hídricos e Ambiental. Defesa: Curitiba, 16/03/2017
Inclui referências e apêndices
Resumo: A carência de medidas de fluxos de gases de efeito estufa (GEE), junto com as incertezas referentes às extrapolações de emissões pontuais para emissões totais, resultam em conclusões imprecisas referente a participação de reservatórios no clima global. O modelo matemático CICLAR é usado para simular fluxos de CO2 e CH4 por 45 anos no reservatório de Capivari, Paraná, Brasil. O modelo é estruturado em compartimentos de diferentes formas de carbono, como o carbono inorgânico dissolvido (CID) e o carbono orgânico particulado vivo (COPL). Processos químicos de transferência de massa entre compartimentos são modelados como reações de primeira ordem e de saturação que são controladas por parâmetros numéricos. O valor destes parâmetros são calibrados através da minimização de diferenças entre dados observados e modelados através de algoritmos de calibração. O algoritmo metaheuristico de Otimização Multi-objetivo por Enxame de Particulas Combinada de Pareto (CPMOPSO), que combina técnicas de seleção de líderes, mutações e subenxames, foi desenvolvido e aplicado como método de otimização. O algoritmo de calibração automática utiliza dados provenientes da calibração manual. Quatro cenários foram analisados: o avaliativo, que usa os primeiros 30 e os últimos 15 anos de dados do reservatório para calibrar e validar o modelo; e o retrospective, o prospectivo e o ideal, que usam 9 anos de dados, distribuídos de maneiras diferentes, para calibrar o modelo. A qualidade dos resultados da calibração foi positivamente considerada através do uso do cenário avaliativo. Os resultados da calibração sob os cenários retrospectivo e prospectivo mostraram que o algoritmo tende a superestimar emissões de metano se dados mal distribuídos são utilizados. A otimização sob o cenário ideal obteve melhores resultados e mostrou que a disposição dos dados tem maior impacto do que a quantidade sobre a calibração. Todas as soluções sob todos os cenários obtiveram soluções com coeficientes de Nash-Sutcliffe superiores a 0.95 para o período de calibração. As distribuições acumuladas das médias dos Potenciais de Aquecimento Global (GWP) mostraram que a maioria das soluções calibradas classificam o reservatório como um sumidouro de dióxido de carbono equivalente, absorvendo até 90 Gg de CO2 eq. Estimativas alternativas de estoque de carbono foram utilizadas para calibrar o modelo em um escopo em que nenhuma solução prévia é conhecida. São feitas considerações adicionas referentes a aplicação de métodos de análise de incertezas e agregação Bayesiana para melhor aferir múltiplos conjuntos de parâmetros. Palavras-chaves: Modelagem matemática. Dinâmica do carbono. Gases de efeito estufa. Potencial de aquecimento global. Enxame de partículas. Dominância de Pareto.
Abstract: The low availability of measured greenhouse gas (GHG) fluxes for lakes and reservoirs, coupled with uncertainties regarding extrapolating total reservoir emissions from point measurements, result in inaccurate conclusions regarding the role of reservoirs in the global climate. The Carbon Cycle in Lakes and Reservoirs (CICLAR) model is used to study potential contributions, through carbon dioxide (CO2) and methane (CH4) emissions, of the Capivari reservoir, Brazil, since its construction in 1970. The model is structured in compartments for different carbon forms, such as dissolved inorganic carbon (DIC) and live particulate organic carbon (POCL), and model chemical processes as first order reactions controlled by numerical parameters. The values of these parameters are calibrated by minimizing differences between original and modeled data through an optimization algorithm. The Combined Pareto Multi-objective Particle Swarm Optimization (CPMOPSO) metaheuristic algorithm, which combines leader selection, mutation and subswarm techniques, is developed and successfully used as the optimization technique. The automated calibration algorithm uses data originated from the manual calibration. Four calibration scenarios are used to analyze the impact of data disposition in the calibration results: the evaluative scenario that has the initial 30 years to calibrate and the final 15 to validate the model; and the retrospective, prospective and ideal scenarios, that uses 9 years of data differently distributed. The evaluative data scenario is used to assess the quality of the calibration results, which successfully fit the validation data. The retrospective and prospective scenario are used to analyze the performance of the calibration under unevenly spread data, and the results show that the model had a bias to overestimate methane emissions. The calibration under the ideal scenario is used to show that having evenly spread data has a bigger impact on calibration results than having larger amounts of data. All calibrated solutions for all scenarios present Nash-Sutcliffe coefficient values higher than 0.95 for the calibration period. The cumulative distribution of average Global Warming Potential (GWP) indexes shows that most calibrated solutions estimated that the Capivari reservoir is a sinkhole for equivalent carbon dioxide and that it can absorb up to 90 Gg of equivalent CO2. Alternative carbon stock estimations are used to calibrate the model under a framework in which the results cannot be validated due to no previous solutions being known. Further consideration are drawn regarding the application of uncertainty analysis and Bayesian aggregation methods to better assess the combination of multiple set of parameters. Keywords: Mathematical modeling. Carbon dynamics. Greenhouse gases. Global warming potential. Particle swarm optimization. Pareto dominance.
Stimson, Andrew Graham. "Fluvial carbon dynamics in degraded peatland catchments". Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/fluvial-carbon-dynamics-in-degraded-peatland-catchments(94f066bd-cf18-4de3-9e4f-339476994fbf).html.
Pełny tekst źródłaDickey, Richard Jason Bayne David Roberge. "Oligotrophication effects following diversion of waste effluent from an embayment of Lake Martin, Alabama". Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Fall/Theses/DICKEY_RICHARD_7.pdf.
Pełny tekst źródłaGraham, Philip Mark. "Modelling the water quality in dams within the Umgeni Water operational area with emphasis on algal relations / Philip Mark Graham". Thesis, North-West University, 2007. http://hdl.handle.net/10394/1022.
Pełny tekst źródłaThesis (Ph.D. (Botany))--North-West University, Potchefstroom Campus, 2004.
Mi, Chenxi [Verfasser], Dietrich [Gutachter] Borchardt, Thomas U. [Gutachter] Berendonk i Karsten [Gutachter] Rinke. "Assessing climate change impacts on physical structure of lakes and reservoirs using one, two and three-dimensional hydrodynamic models / Chenxi Mi ; Gutachter: Dietrich Borchardt, Thomas U. Berendonk, Karsten Rinke". Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1227833091/34.
Pełny tekst źródłaRodrigues, Sonia Luiz. "Comparação da atenuação da radiação solar e dos fatores que determinam o clima de radiação solar subaquática em lagos e reservatórios do Brasil". Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-23092003-112001/.
Pełny tekst źródłaThe study of solar radiation penetration in aquatic environment was developed in four parts. The first one, directed to solar radiation attenuation in the water column, interference factors and their inter-relations were discussed. In this sense, a penetration comparison of the solar radiation in natural and artificial continental ecosystems was carried out, analyzing differences and similarities. The second part of this work consisted of a comparative study of underwater solar radiation in the entire reservoir. The comparison was done between reservoirs that are near to one another, but with marked differences in use and occupation within the regions where they are located. In the third part, two resources of great utilization in obtaining immediate response from the aquatic environment, from an optical point of view of the impacts experienced, were presented. The first resort was the spectrogram determination of solar radiation, which indicated the underwater solar radiation attenuation in the active photosynthetic range (400 nm - 700 nm). The other resort was the superficial water absorption spectrum, which allowed establishing the Water Spectral Absorption Index, I.A.E.A. that easily makes possible detection of accurate sources of pollution and contamination. The fourth and last part proposed to develop an apparatus from the construction of an underwater hydrophotometer (Model 268 WA 310 GM MFG & Instrument Corp. Bronx N.Y. 10451), where the photoconductor detector was adapted and introduced (PIN - 250DP) substituting the previously damaged photocells. During field work, this apparatus was tested and comparison was performed with data obtained from Quanta-meter LI-COR (LI - 185A), also used in this work.
Tavares, Katia Sendra. "A comunidade de macrófitas aquáticas em reservatórios do médio e baixo Rio Tietê (SP) e em lagos da bacia do médio Rio Doce (MG)". Universidade Federal de São Carlos, 2002. https://repositorio.ufscar.br/handle/ufscar/2060.
Pełny tekst źródłaUniversidade Federal de Sao Carlos
Macrophytes have a fundamental role in the functioning of aquatic ecosystems due to their high primary productivity, participation in the nutrient cycling, and interactions with many other components of the system. Many species of macrophytes can be bioindicator of the trophic state or succession stage of the system. In the present work the macrophyte communities of twelve lakes in the Middle Rio Doce (MG) and a cascade of six reservoirs (SP) were analysed, comparing systems naturally and artificially fragmented. Four sampling expeditions to the Rio Doce system and three to the Tietê were performed during the 2001 2002 period. The macrophyte species present were recorded, photographed and collected for herborization. The community was analysed in relation to the species richness, dominant species, the frequence of occurrence and the species composition similarity, intra and inter lake and reservoir systems. The relationship between species richness and lake morphometry was also analised. Macrophyte biomass was determined for selected stands, in order to verify the existence of temporal variations. In the lakes of Middle Rio Doce system a total of 53 species were registered, belonging to 25 genera and 23 families. The occurrence of Habenaria fastor Hoene (Orchidaceae) in this system of lakes was recorded for the first time. The highest richness occurred in the lakes Barra and Verde. Species composition varied considerably among lakes and between periods. No statistically significant relationships were found between species richness and variables related to lake morphometry, although a tendency of increase in the species richness as a function of the increase in the area and perimeter of the lakes was observed. In Tietê reservoirs a total of 48 species were found, belonging to 26 genus and 22 families. The species composition in the first three reservoirs (Middle Tietê) differed from that on the last three reservoirs (Low Tietê). The relationship among the species richness and reservoir morphometry was not statistically significant, however there was a tendency of decreasing richness as the reservoir area or perimeter increased. Twenty three species were shared among both systems; 23 exclusively on lakes of Middle Rio Doce and 18 exclusively in on Tietê reservoirs. The families Cyperaceae and Onagraceae were the ones represented by the highest number of species in both systems. Marked differences were found between the studied systems. The macrophyte species richness was higher in the Middle Rio Doce lakes than in the Tietê reservoirs. In the lakes the increase in the area and perimeter were factors directly related to the increase in species richness whereas in the reservoirs this relationship was inverse. Biomass of macrophytes in selected stands varied greatly between periods, however total biomass per areal unity was similar, although the highest values were recorded in Nova Avanhandava and Ibitinga reservoirs. The results of this study have indicated that the lakes of Middle Rio Doce being a naturally fragmented system, ancient and stable, have a higher macrophyte diversity, whereas the Tietê reservoirs, recently and artificially fragmented and also with greater instability have a lower diversity. Also, the species richness in the reservoirs appeared to be not directly related to the area and perimeter, variables which are representative of their most propitious habitats in natural systems.
As macrófitas aquáticas têm papel fundamental no funcionamento dos sistemas aquáticos devido às suas elevadas taxas de produtividade primária, importância na ciclagem de nutrientes e interações com diversos outros componentes do sistema. Muitas macrófitas podem ser bioindicadoras do grau de trofia ou do estágio sucessional do sistema. O presente trabalho analisou as comunidades de macrófitas aquáticas de doze lagos do médio rio Doce (MG) e de seis reservatórios em cascata no médio e baixo rio Tietê (SP), comparando sistemas fragmentados de forma natural e artificial. Foram realizadas quatro amostragens no médio rio Doce e três no médio e baixo rio Tietê, durante o período de 2001 a 2002. As espécies de macrófitas presentes foram registradas, fotografadas e coletadas para herborização. A comunidade foi analisada quanto à riqueza de espécies, espécies predominantes, freqüência de ocorrência, similaridade da composição de espécies dentro e entre os sistemas e quanto às possíveis relações com o estado trófico dos ambientes e com as variáveis morfométricas. A biomassa foi determinada para determinados bancos de macrófitas, visando observar a variação temporal da mesma. Para os lagos do médio rio Doce foram registradas 53 espécies, distribuídas em 25 gêneros e 23 famílias. A ocorrência de Habenaria fastor Hoene (Orchidaceae) foi registrada pela primeira vez neste sistema de lagos. A maior riqueza de espécies ocorreu nas lagoas da Barra e Verde. A composição de espécies variou consideravelmente entre os lagos e entre as épocas. Não foram verificadas relações estatisticamente significativas entre a riqueza de espécies e as variáveis morfométricas,embora tenham sido observadas tendências de aumento da riqueza de espécies em relação ao aumento da área e do perímetro dos lagos. Para os reservatórios do médio e baixo rio Tietê foram encontradas 48 espécies, pertencentes a 26 gêneros e 22 famílias. A composição de espécies nos três primeiros reservatórios (Médio Tietê) foi bastante diferenciada daquela dos três últimos (baixo Tietê). As relações entre a riqueza de espécies e as variáveis morfométricas não foram estatisticamente significativas, notando-se, porém, uma tendência de diminuição da riqueza em função do aumento da área e do perímetro dos reservatórios. Foram encontradas 23 espécies comuns aos dois sistemas; 23 exclusivas dos lagos do médio rio Doce e 18 exclusivas dos reservatórios do rio Tietê. Em ambos os sistemas as famílias Cyperaceae e Onagraceae estiveram representadas por maior número de espécies. Foram constatadas diferenças significativas entre os dois sistemas estudados. A riqueza de espécies foi maior para os lagos do médio rio Doce do que para os reservatórios do médio e baixo Tietê. Para os lagos o aumento da área e perímetro constituíram fatores diretamente relacionados ao aumento da riqueza de espécies enquanto para os reservatórios essa relação foi inversa. Os valores de biomassa para bancos de macrófitas amostrados nos dois sistemas mostraram variações acentuadas entre os períodos, contudo a biomassa por unidade de área foi similar, sendo os maiores valores registrados nos reservatórios de Nova Avanhandava e Ibitinga. Este estudo indica que os lagos do rio Doce sendo sistemas naturalmente fragmentados, antigos e estáveis contêm uma maior diversidade de macrófitas aquáticas enquanto os reservatórios oriundos de fragmentação artificial e recente, e por serem mais instáveis contêm menor diversidade de macrófitas e não diretamente correlacionadas com as variáveis morfométricas representativas dos habitats propícios às mesmas em ambientes naturais, como a área e o perímetro.
Chang, Yan. "Impacts of Climate Changeson Reservoirs in Northern Sweden : case study of Akkajaure reservoir by modelling". Thesis, Linköpings universitet, Tema vatten i natur och samhälle, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-68419.
Pełny tekst źródłaSachse, René. "Influence of climate change on lake ecosystems - disentangling physical, chemical and biological interactions". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-167312.
Pełny tekst źródłaDer Klimawandel beeinflusst Seeökosysteme vielfältig durch direkte und indirekte Temperatureffekte auf die hydrophysikalische Struktur, die Hydrologie, chemische Kreisläufe und biologische Interaktionen. Die Identifikation von Klimasignalen kann durch Landnutzungs- und weitere Umweltveränderungen überlagert werden. Ziel dieser Arbeit war es, Temperatureffekte von Effekten zu unterscheiden, die durch Gewässermanagement oder anderen Umweltveränderungen verursacht werden. Weiterhin sollten komplexe Prozesse verstanden werden, die zu signifikanten Veränderungen in Seeökosystemen führen. Dieses Verständnis ist für Talsperren- und Gewässermanager von besonderer Bedeutung, um ungewünschten Folgen des Klimawandels entgegenwirken zu können. Für die Studie wurden Langzeitdaten für meteorologische, hydrophysikalische und biologische Variablen (Phytoplankton, Crustaceen-Zooplankton, Fischbesatz) der Talsperre Saidenbach ausgewertet. Mehrere Indikatoren für die Auswirkungen des Klimawandels konnten basierend auf diesen Daten identifiziert werden. Diese gehören insbesondere eine Erhöhung der Wassertemperatur seit 1975, zeitigere Eisaufbrüche und eine veränderte Schichtungsstruktur. Dabei wurde im Sommer die Schichtungsstabilität höher und die Intensität der Durchmischung geringer. Das Wasser in der Talsperre erwärmte sich stärker als die Zuflüsse, wodurch diese sich zunehmend tiefer und unterhalb der Thermokline einschichten. Eine zunehmende jährliche Phytoplanktonbiomasse und Artenwechsel innerhalb der Planktongemeinschaft sind weitere Indikatoren für Klimafolgen. Die Kieselalge Aulacoseira subarctica erlangte in Jahren mit warmen Wintern und zeitigen Eisaufbrüchen eine Dominanz während der Frühjahrsentwicklung. Das ungewöhnliche Auftreten dieser Art in aphotischen Tiefen konnte durch eine leichtere Resuspension im Vergleich zu anderen Kieselalgen erklärt werden. Durch zeitige Resuspension gleich nach Eisaufbruch kann A. subarctica ein hohes Inokulum etablieren. Trotz reduzierter Nährstoffzufuhr ins Epilimnion wurde im Sommer die Kieselalge Fragilaria crotonensis vermehrt durch Cyanobakterien verdrängt, was jedoch gut mit den Änderungen der hydrophysikalischen Struktur erklärt werden kann. Obwohl seit 1990 insgesamt mehr Phytoplankton zur Verfügung steht konnte das Crustaceen- Zooplankton in der Talsperre Saidenbach nicht von diesen verbesserten Nahrungsbedingungen profitieren. Die Daphnia-Abundanzen waren seit 1990 stark verringert. Es konnte gezeigt werden, dass der Einfluss des Fischbesatzes unterschätzt wurde und die künstlich ins System eingebrachten Silberkarpfen zeitweise bis zu 70% der zooplanktivoren Fischbiomasse ausgemacht haben. Zoo- planktivore Fische haben einen temperatur- und dichteabhängigen Effekt auf das Zooplankton. Das schnellere Populationswachstum von Daphnia kann bei hohem Besatz mit zooplanktivoren Fischen nicht die erhöhte Fraßaktivität der Fische ausgleichen. Dennoch konnte Temperatur als der wichtigste Einflussfaktor auf die Phänologie des Zooplanktons identifiziert werden, gefolgt von zooplanktivorem Fisch und Nährstoffzufuhr. Die Wichtigkeit von submersen Makrophyten in Flachseen ist gut untersucht. Um den Einfluss von Makropyhten auf die Wasserqualität während des Klimawandels auch in tiefen Seen abschätzen zu können, wurde ein komplexes Seemodell entwickelt. Die Simulationen zeigen, dass sich Makrophyten hauptsächlich positiv auf die Wassergüte auswirken und zur Reduktion von Phytoplankton, insbesondere von Cyanobakterien im Sommer, beitragen. In einem 11 m tiefen See betrug die Reduktion 50 %, in 100 m tiefen oligotrophen Seen immer noch 15 %. Die Konkurrenz um Nährstoffe mit dem Phytoplankton war dabei die ursächliche Makrophyten-Plankton-Interaktion. Submerse Makrophyten könnten für die Restaurierung von tiefen Seen folglich genauso wichtig sein, wie für Flachseen. Das komplette Seemodell enthält hydrophysikalische und ökologische Module und ermöglicht damit weitere umfassende Simulationen zur Untersuchung der Auswirkungen des Klimawandels und zur Evaluation von Adaptionsstrategien für Seen und Talsperren
Stott, A. P. "Reservoir sedimentation and land use change in north west England". Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379152.
Pełny tekst źródłaClifford, Philip A. (Philip Alan). "Aquatic Vegetation Nutrient Budgets and Sedimentation in a Southwestern Reservoir". Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc504467/.
Pełny tekst źródłaWilliams, Nicholas T. "Modeling dissolved oxygen in Lake Powell using CE-QUAL-W2 /". Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1755.pdf.
Pełny tekst źródłaAlmeida, Caio Augusto de. "Aspectos do ciclo de vida de espécies bentônicas nativas e sua utilização na avaliação da qualidade de sedimentos de lagos naturais e reservatórios". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-29082007-210238/.
Pełny tekst źródłaThe ecological studies, with views for the conservation of the environment, have been intensified from middles of the century XX. Due to the integration with several other sciences during the process of ecological knowledge formation, those studies have become essential to the development of technologies and appropriate politics for the administration of the natural resource. Studies that contemplate the comparison among natural and artificial systems are important in the way it is allowed to investigate as those systems react to antropogenic disturbances of short or long periods. There is a general consensus that the sediment of the water bodies plays a fundamental part in the transport dynamics, accumulation and disposal of pollutants in these systems. The triad of sediment quality is considered one of the best approaches for the study the influence of pollutants originated from of human activities in aquatic ecossystems. Freshwater habitats are particularly susceptible to the introduction of exotic species of invertebrates. A possible route of introduction of those species is the cultivation in laboratory for toxicity tests. To substitute them for native species with similar sensibility can prevent the accidental introduction of exotic species, besides facilitating the inocula obtaining for the renewals of the culture, and may be more significant in the extrapolation of the laboratories results for field situations. Two native species of benthic organisms were studied regarding to aspects of their biology and the adaptation as organism-test in ecotoxicological assays: Chironomus xanthus (Díptera) and Branchiura sowerbyi (Oligochaeta). The results of the toxicity tests to the pcp for C. xanthus allowed to calculate a LC50 (96h) of 0,111 mg/L with a sensitivity range of 0,082 - 0,141 mg/L. The sensitivity testes for B. sowerbyi to the KCl resulted in a LC50 (96h) of 0,364 g/L with a sensitivity range of 0,177 - 0,551 g/L. An energy budget of C. xanthus was performed, being obtained the following values for the calculated metabolic efficiencies: instantaneous coefficient of assimilation of 98,14%, coefficient of production of 14,76% and coefficient of liquid production of 15,03%. A comparative study among the system of reservoirs in cascade of the Tietê river with the system of natural lakes of Rio Doce valley was applied following the principles of the triad of quality of sediments. The results of that analyze allowed to classify the reservoirs studied in agreement with the level of environmental quality and the reservoir of Barra Bonita (SP) is considered as the one of worse quality, while the lakes of Rio Doce Valley (MG) still meet relatively preserved.
Belinsky, Tammy L. "The effects of lake dymanics on the water quality of Abel Lake Reservoir". Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43832.
Pełny tekst źródłaMaster of Science
Eggink, Judith. "An Investigation of the Limnological Dynamics of Lake Manassas". Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/36059.
Pełny tekst źródłaMaster of Science
Radford, Wilbur Edward. "Relocation of earthquakes in the Lake Sinclair reservoir area". Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/25807.
Pełny tekst źródłaDu, Feu Timothy Avon. "Tropical reservoir fisheries : Lake Kainji, Nigeria: a case study". Thesis, University of Hull, 2003. http://hydra.hull.ac.uk/resources/hull:5505.
Pełny tekst źródłaDodson, Susan Boyd. "Eutrophication Potential of Reclaimed Wastewater: An Ecological Study of Water Reuse in an Urban Texas Reservoir". Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc935568/.
Pełny tekst źródłaEstrada, Miguel Angel. "The dynamics of the planktonic communities of two Oregon reservoirs". PDXScholar, 2000. https://pdxscholar.library.pdx.edu/open_access_etds/4307.
Pełny tekst źródłaSaji, Niffy. "Development of a Guide to Lake and Reservoir Zone Determination". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31587.
Pełny tekst źródłaThere are many characteristics, both physical and chemical, that differentiate between these three zones. Based on the differences in characteristics between the three zones, a method has been developed to successfully divide any reservoir into three zones. The method developed was applied to Lake Manassas and the Occoquan Reservoir located in the Occoquan watershed in Virginia. Both are man-made impoundments.
Analysis of data, based on the method developed, was successfully in dividing both reservoirs into the three zones. This method may therefore be successfully applied to obtain zonation in reservoirs.
Master of Science
Banks, Kenneth E. (Kenneth Edward). "Analysis of Phytoplankton Responses to Water Chemistry Dynamics in a Moderately Eutrophic North Texas Reservoir". Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc278929/.
Pełny tekst źródłaAmbers, Rebecca Kelly Robinson. "Sedimentation, mercury contamination, and clay mineralogy of the Dorena Lake Watershed, Western Oregon /". view abstract or download file of text, 2000. http://wwwlib.umi.com/cr/uoregon/fullcit?p9978243.
Pełny tekst źródłaTypescript. Includes vita and abstract. Includes bibliographical references (leaves 169-178). Also available for download via the World Wide Web; free to University of Oregon users.
Holley, Michael Paul Maceina Michael J. "An evaluation of the catfish fishery in Wilson Reservoir, Alabama". Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Fall/Theses/HOLLEY_MICHAEL_23.pdf.
Pełny tekst źródłaEl-Arabawy, Mohsen Mohamed Mohamed. "Lake Nasser reservoir sedimentation estimates for various water resources planning alternatives". Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342801.
Pełny tekst źródłaWatschke, Darin Allen. "Assessment of tributary potential for wild rainbow trout recruitment in Hebgen Reservoir, Montana". Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/watschke/WatschkeD0506.pdf.
Pełny tekst źródłaCassidy, Kelly Michela. "Use of Remote Sensing for Cover Type Interpretation Over the Ray Roberts Reservoir Area". Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc798144/.
Pełny tekst źródłaMcGinnis, Daniel Frank. "Two-Dimensional Lake and Reservoir Modeling: Natural and Plume-Induced Mixing Mechanisms". Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/29395.
Pełny tekst źródłaPh. D.
高橋, 浩., Hiroshi A. Takahashi, 秀樹 和田, Hideki Wada, 俊夫 中村, Toshio Nakamura, 英樹 三浦 i Hideki Miura. "<14>^C anatomy of algae in inland ponds and lakes, Antarctica". 名古屋大学年代測定資料研究センター 天然放射性元素測定小委員会, 1999. http://hdl.handle.net/2237/13443.
Pełny tekst źródłaBray, Brandon. "Mafic replenishhment of multiple felsic reservoirs at the Mono domes and Mono Lake islands, California". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123289.
Pełny tekst źródłaLe champ volcanique de Long Valley est connu pour l'éruption paroxysmale du Bishop Tuff, qui a excavé la caldeira il y a 0.76 Ma. L'activité postcaldeira fut concentrée initialement au sein de la caldeira et le long de ses frontières occidentales et méridionales. À partir de 60 ka, cependant, le volcanisme intracaldeira a cessé et le centre de l'activité s'est dirigé vers le nord, dans le bassin de Mono. Au cours des 60 000 années suivantes, les éruptions fréquentes ont produit les dômes de Mono et les laves du lac Mono. Les laves du lac Mono et les enclaves qui sont présentes dans plusieurs des dômes de Mono constituent le seul matériau de composition intermédiaire (andésitique, dacitique) qui a été éclaté dans le bassin de Mono. L'activité récente à Long Valley, combinée avec la jeunesse des laves du bassin de Mono, met l'accent sur l'importance de mieux comprendre les processus pétrogénétiques qui ont mené à la génération de ces roches. Nous avons entrepris une étude du volcanisme du bassin de Mono qui inclut des analyses des éléments majeurs et traces dans les roches, des analyses isotopiques de Sr, Nd, Pb, et O, et des analyses par microsonde électronique de verres volcaniques, de plagioclases, et d'amphiboles. Les variations en éléments suggèrent que la cristallisation fractionnée de feldspaths (Sr, K2O), d'apatites (P2O5), de titanomagnétites (V), de zircons (Zr), et d'une phase qui affecte les éléments de terres rares légères (La, Ce) a influencé l'évolution des laves. Les observations de terrain, la pétrographie, et la chimie démontrent ainsi que l'injection de magma mafique est un processus important. Les enclaves mafiques sont de formes étirées et arrondies, avec des marges figées entre les enclaves et la rhyolite hôte. Les lames minces de roches qui proviennent du long de la marge entre les enclaves et la rhyolite révèlent des inclusions de rhyolite de taille de l'ordre de quelques millimétres, et vice versa. La dacite de l'île de Paoha contient du verre ayant une composition en silice de 67-72% par masse. Elle contient des gouttes microscopiques de verre plus mafique, avec un contenu en SiO2 aussi bas que 64 pourcent poids. Les basaltes régionaux récentes et les enclaves des dômes de Mono possèdent les valeurs isotopiques les moins radiogéniques de tout le champ volcanique de Long Valley, avec 87Sr/86Sri <0.7056 et 143Nd/144Nd >0.5126. Les laves du lac Mono et les rhyolites des dômes de Mono ont des signatures plus influencées par la croûte terrestre, avec 87Sr/86Sri >0.7058 et 143Nd/144Nd <0.5127. Ces valeurs sont comparables à celles du Bishop Tuff. Les isotopes d'oxygène et de plomb dans la suite possèdent des signatures crustales, avec 206Pb/204Pb >19 et δ18O > +6.5 ‰. Les laves du lac Mono sont généralement plus jeunes et moins évoluées que celles des dômes de Mono, avec des valeurs de 143Nd/144Nd inférieures et de 206Pb/204Pb supérieures à celles des dômes. Elles démontrent aussi un enrichissement en éléments traces comme le Ba et le Sr. Ces observations impliquent que les dômes de Mono et les laves du lac Mono sont issus de lots de magmas différents, sinon de chambres magmatiques distinctes. L'absence de relation systématique entre le niveau d'évolution chimique et l'âge des laves suggère que plusieurs lots de magmas sont impliqués dans le développement des dômes de Mono. Les différences prononcées dans la composition en éléments traces (Nb, Y) et en valeurs isotopiques entre les laves de l'île de Negit et de l'île de Paoha indiquent que celles-ci sont aussi les produits d'une évolution d'au moins deux lots différents de magma de compositions intermédiaires. L'activité volcanique dans la région sud de la caldeira de Long Valley n'écarte pas la possibilité d'activité volcanique future. De plus, le volcanisme récent dans le nord de la caldeira, combiné avec la thèse de la recharge mafique sous le bassin de Mono, suggère que le bassin et les dômes de Mono pourraient connaitre de nouvelles éruptions futures.