Dissertations / Theses on the topic 'Lake restoration'
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Balangoda, Anusha. "Impact of Artificial Aeration on Nutrients in Small Eutrophic Lakes." Diss., North Dakota State University, 2014. http://hdl.handle.net/10365/24669.
Full textRowland, Jennifer M. "Restoration ecology of Cirsium pitcheri along Lake Huron sand dunes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ42096.pdf.
Full textBrännström, Klara. "Övergödningen av Uttersjöträsket : Åtgärdsförslag baserade på data från Skellefteå kommun och egna vattenprovtagningar." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-123300.
Full textNewport, Ruth A. "Arguments, argumentation and agreement a symbolic convergence study of the Lake Omapere Project : a thesis submitted to Auckland University of Technology in partial fulfillment of the requirements for the degree of Master of Arts (MA), 2007 /." Click here to access this resource online, 2007. http://hdl.handle.net/10292/163.
Full textHopkins, Aareka. "The potential for Charophyte re-establishment in large, shallow, eutrophic lakes with special reference to Lake Waikare, New Zealand." The University of Waikato, 2006. http://hdl.handle.net/10289/2419.
Full textWhite, Arthur J. "A 1982 restoration feasibility study of Lakes of the Four Seasons in Northwestern Indiana." Virtual Press, 1985. http://liblink.bsu.edu/uhtbin/catkey/426076.
Full textWelch, Zachariah C. "Restoring pattern without process in lake restoration a large-scale littoral habitat enhancement project on Lake Tohopekaliga, Florida /." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041053.
Full textSmith, David Charles. "The population biology of Charophytes in the context of shallow lake restoration." Thesis, University of East Anglia, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398499.
Full textRodrigue, Donald Anthony Jr. "An Evaluation of Submersed Aquatic Vegetation Transplanting Methods for Lake Pontchartrain Restoration." ScholarWorks@UNO, 2004. https://scholarworks.uno.edu/td/2658.
Full textDietz, Alyssa K. "Soil and Litter Legacy Effects of Invasive Flowering Rush (Butomus umbellatus) on Lake Erie Wetland Restoration." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1435754458.
Full textMorrison, Edward Howard James. "Ecological restoration of papyrus wetlands at Lake Naivasha, Kenya : social and ecological considerations." Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/28183.
Full textPikuła, Katarzyna. "Restoration of Parnowskie Lake using the pulverizing aeration technique : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2016. http://dlibra.tu.koszalin.pl/Content/1052.
Full textMedeiros, Leonardo Rafael. "Unraveling knowledge gaps about cyanobacterial blooms and proposing an alternative for lake restoration." PROGRAMA DE P?S-GRADUA??O EM ECOLOGIA, 2016. https://repositorio.ufrn.br/jspui/handle/123456789/22293.
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A eutrofiza??o artificial tem sido considerada um problema de grande preocupa??o nos ecossistemas aqu?ticos em todo o mundo. Desde 1960, os avan?os cient?ficos t?m sido feitos a fim de desenvolver t?cnicas que atenuem os efeitos da eutrofiza??o. V?rios procedimentos f?sicos, qu?micos e biol?gicos podem ser usados e combinados para recuperar lagos de flora??es de cianobact?rias, como a aplica??o de um floculante combinado com argila natural ou modificada. No entanto, a efic?cia dos solos de regi?es ?ridas na mitiga??o de flora??es ? desconhecida para lagos artificiais brasileiros. Neste artigo, apresentamos uma an?lise bibliom?trica da evolu??o de publica??es sobre flora??es de cianobact?rias e identificamos registros que diretamente objetivam superar a ocorr?ncia dessas flora??es. Al?m disso, avaliamos, por meio de experimentos laboratoriais, o efeito do uso combinado do floculante policloreto de alum?nio (PAC) e um solo local do entorno do lago (LS), como lastro, no controle de flora??es de cianobact?rias em um lago raso da regi?o semi?rida do Brasil. A pesquisa bibliom?trica foi conduzida com o banco de dados "Web of Science" atrav?s da fun??o de busca ?TS = ((cyanobacteri* or blue green algae or cyanoprokariote or cyanophyceae) and (mass accumulation or bloom or domina*))?, de 1969 a junho de 2016. Realizamos uma an?lise de freq??ncia de palavras-chave e quantificamos o n?mero de registros com uma abordagem de restaura??o. Al?m disso, foram realizadas tr?s s?ries de experimentos em tr?s momentos com flora??es diferentes em composi??o e biomassa no Reservat?rio Armando Ribeiro Gon?alves. Nossa pesquisa revelou que os estudos sobre as flora??es de cianobact?rias aumentaram exponencialmente e seu impacto quantitativo nas ci?ncias aqu?ticas aumentou significativamente ao longo dos anos (F = 97,52; p <0,0001). Os EUA se destacam como a na??o mais produtiva, seguida pela China e pa?ses europeus. A China aumentou impressionantemente sua contribui??o para essa ?rea, superando os EUA nos ?ltimos cinco anos. Estudos sobre Microcystis e toxinas, tais como microcistinas, s?o tend?ncias de investiga??o, devido a sua omnipresen?a e suas consequ?ncias negativas hist?ricas. Tamb?m enfatizamos a necessidade de mais estudos com o objetivo de desenvolver t?cnicas para resolver e/ou mitigar a quest?o das flora??es. Em vista disso, nossos experimentos revelaram que o uso de PAC e LS teve um efeito not?vel na biomassa de cianobact?rias da coluna de ?gua em todas as amostragens, reduzindo at? 90% a concentra??o de clorofila-a. O uso de LS sozinho foi ineficiente para remover a biomassa de algas azuis. Em duas amostragens, a combina??o de floculante e lastro apresentou a mesma efic?cia que o uso apenas de PAC. Mesmo assim, o uso de LS ? importante para garantir a sedimenta??o. Combinado com PAC, o LS foi um lastro t?o eficiente em remover cianobact?rias quanto uma argila modificada comercialmente dispon?vel (Phoslock?). Embora LS in natura tenha liberado quantidades consider?veis de f?sforo e n?o apresentou capacidade de adsor??o de P, tal argila conseguiu adsorver quantidades moderadas de f?sforo dissolvido ap?s a mat?ria org?nica ter sido removida por muflagem. Este estudo mostra que LS ? uma alternativa economicamente vi?vel e sustent?vel para ser utilizada como a??o de manejo em reservat?rios apresentando flora??es na regi?o semi?rida do Brasil.
Artificial eutrophication has been considered a problem of major concern in aquatic ecosystems around the world. Since 1960, scientific advances have been made in order to develop techniques that mitigate the effects of eutrophication. Several physical, chemical and biological procedures can be used and combined to recover lakes from cyanobacterial blooms, such as the application of a flocculant combined with natural or modified clay. However, the efficacy of local dryland soils in mitigating blooms is unknown for Brazilian manmade lakes. In this paper, we present a bibliometric analysis of the evolution of publications about cyanobacterial blooms and identify records that directly aim to overcome the occurrence of these blooms. Also, we evaluate, through laboratory experiments, the effect of the combined use of flocculent polyaluminum chloride (PAC) and a local soil from the lake catchment (LS), as ballast, in controlling cyanobacterial bloom in a shallow lake of the semiarid region of Brazil. The bibliometric research was conducted with the ?Web of Science? database through the search function ?TS = ((cyanobacteri* or blue green algae or cyanoprokariote or cyanophyceae) and (mass accumulation or bloom or domina*))?, from 1969 to June 2016. We performed a keyword frequency analysis and quantified the number of records with a restoration approach. Besides, three sets of experiments were performed in three sampling occasions with different bloom compositions and biomass in Armando Ribeiro Gon?alves Reservoir. Our study revealed that studies about cyanobacterial blooms increased exponentially and their quantitative impact on the aquatic sciences increased significantly along the years (F = 97.52; p < 0.0001). The USA stands out as the most productive nation, followed by China and European countries. China has impressively increased its contribution to this area, surpassing the USA in the last five years. Studies about Microcystis and toxins, such as microcystins, are trends in research, due to their ubiquitousness and historical negative consequences. We also emphasize the need for more studies aiming at developing techniques to solve and/or mitigate the issue of blooms. In view of this, our experiments revealed that the use of PAC and LS had a remarkable effect on cyanobacterial biomass in the water column in all samplings, reducing up to 90% top chlorophyll-a concentration. The use of LS alone was inefficient to settle blue-green-algal biomass. In two samplings, the combination of flocculant and ballast exhibited the same efficacy as the use of solely PAC. Even so, the use of LS is important to ensure sedimentation. Combined with PAC, LS was as efficient a ballast to remove cyanobacteria as a commercially available modified clay (Phoslock?). Althugh LS in natura released considerable amounts of phosphorus and did not present P adsorption capacity, it managed to adsorb some dissolved phosphorus after organic matter was removed through muffling. This study shows that LS is a cheap, feasible and environment-friendly alternative to be used as a management action in reservoirs undergoing blooms in the semiarid region of Brazil.
Singh, C. R. "Hydrological and hydraulic modelling for the restoration and management of Loktak Lake, Northeast India." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/805119/.
Full textChristensen, Andrea Ludlow. "The Rhetoric of Newspaper Rivalry in the Face of Image Restoration and Transformation." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd886.pdf.
Full textVäisänen, T. (Tero). "Sedimentin kemikalointikäsittely:tutkimus rehevän ja sisäkuormitteisen järven kunnostusmenetelmän mitoituksesta sekä sen tuloksellisuuden mittaamisesta." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514292989.
Full textTiivistelmä Rehevän järven kunnostamiseksi on useita menetelmiä: joista tässä tutkimuksessa on keskitytty sedimentin kemikaalikäsittelyyn sekä sen tuloksellisuuden mittaamiseen. Tutkimus jakautuu kolmeen osaan: kemikaalikunnostusten järvikohtaiseen tarkasteluun, sedimentin kemikaalikunnostuksen mitoituksen optimointiin sekä järvikunnostuksen tuloksellisuuden arvioimiseen. Tutkimustulosten mukaan sedimentin kemikaloinnilla voidaan sitoa järvessä kiertävää fosforia sedimenttiin, mutta pysyvää sedimentin fosforinsidontakykyä kertaluontoisella kemikaloinnilla ei saavuteta. Järven sisäinen kuormitus siis hetkellisesti hidastuu, mutta ei lopu sedimentin kemikalointiin. Kemikalointi tulee tehdä pienin kerta-annoksin useana vuonna peräkkäin ja sedimentin pH:n tulisi säilyä välillä 6–8 läpi vuoden. Tällöin kemikaali varastoi sitomansa fosforin sedimenttiin. Kemikaalikunnostuksen tärkeimmät mitoitustekijät ovat kemikaalin pH-vaste vesimassaan ja sedimenttiin sekä sidottavissa oleva fosforimäärä kunnostettavassa järvessä. Tutkimuksen mukaan PAX-18-kemikaali ja vastaavat liuosmaiset alumiini- ja rautakemikaalit eivät ole ensisijaisia järvikunnostuskemikaaleja. Ne on kehitetty juoma- ja jäteveden puhdistamiseen, eli sitomaan nopeasti fosforia ja orgaanista ainetta. Sitä vastoin laboratoriokokeen tulosten perusteella rakeiset adsorptio-kemikaalit, kuten Kemiran CFH0818 sitovat sedimentin fosforia itseensä ilman merkittäviä happamoitumisvaikutuksia. Järvikunnostuksen tuloksellisuutta voidaan arvioida mittaamalla sedimentissä vapaana oleva fosfaattimäärä ja sedimentin hapetustila, happamuus sekä määrittämällä sedimentin fosforinsidontakyky. Mittaukset on tehtävä ennen ja jälkeen kunnostustoimia. Näiden mittausten perusteella voidaan kunnostustoimien tuloksellisuutta arvioida varsin luotettavasti. Tulosten käyttöä rajoittavat lähinnä muuttuvat prosessiolosuhteet eri vuodenaikoina ja toistaiseksi riittävän vertailuaineiston puute. Järvikunnostuksen tuloksellisuuden arvioimiseksi on tiedettävä kohdekohtaisesti miksi, milloin ja mistä mitataan, jotta arvio on luotettava
Moreno, Maria C. "Management Tools for Prescribed Burning for Tallgrass Prairie Restoration at the Lewisville Lake Environmental Learning Area." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4405/.
Full textTrolle, Dennis. "The influence of sediment nutrient dynamics on the response of lake ecosystems to restoration and climate change." The University of Waikato, 2009. http://hdl.handle.net/10289/2808.
Full textCollings, Sandy Lyn. "Economic consequences of ecological change: restoration options for the Mfolozi floodplain and implications for Lake St. Lucia, South Africa." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1006950.
Full textZaloumis, Nicholas Paul. "How successful is grassland restoration after removal of pine plantations on the eastern shores of Lake St Lucia?" Bachelor's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/26044.
Full textBerg, Elizabeth A. "The effect of hydrological restoration on nutrient concentrations, macroinvertebrate communities, and amphibian populations in Lake Erie coastal wetlands." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546553406508401.
Full textCranney, Chad R. "Control of Large Stands of Phragmites australis in Great Salt Lake, Utah Wetlands." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4988.
Full textSmith, Jeffrey D. "Phosphorus storage dynamics in wetland vegetation and forage grass species facilitating wetland hydrologic restoration in the Lake Okeechobee watershed /." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015200.
Full textJackwood, Ryan W. "Coupling Ecosystem Rehabilitation to Water Quality Improvements in the Wolf Creek Watershed." University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1557490292340248.
Full textAgbalog, Rose E. Medler Michael. "Effects of fire on cheatgrass (Bromus tectorum) : a case study of fire restoration in the Lake Chelan National Recreation Area, Washington /." Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=350&CISOBOX=1&REC=16.
Full textBakker, Cleo. "Nutrients and biota in a lake system before and after restoration; a data analysis of the Swedish eutrophication case study Växjösjön." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445066.
Full textRaulinaitis, Mindaugas. "Effects of Hydromechanical Lake Remediation on Distribution of Metals and Metalloids in Bottom Sediments." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121227_090648-54420.
Full textNors hidromechaninio ežerų valymo darbai vykdomi jau daugelį metų, iki šiol nėra aišku, kaip pasikeičia ežero aplinkosauginė būklė po jo išvalymo, o Lietuvos ir kitų šalių mokslinėje literatūroje informacijos apie valymo sąlygotus metalų ir metaloidų pasiskirstymo dugno nuosėdose pokyčius yra stebėtinai mažai. Disertacijos tyrime buvo taikoma kompleksinė šių pokyčių vertinimo sistema, pasitelkiant ne tik išsamius geocheminius lauko ir laboratorinius tyrimus, bet ir matematinę statistinę analizę bei erdvinę duomenų prognozę ir interpoliaciją. Tyrimų ir analizės rezultatai parodė, kad hidromechaninis ežero valymas sąlygoja nagrinėjamų metalų ir metaloidų kiekių pokyčius ir jų persiskirstymą dugno nuosėdose, kuris yra savitas atskiriems cheminiams elementams, todėl siekiant nustatyti valymo darbų įtaką būtina naudoti indikatorius, leidžiančius įvertinti bendro, kumuliacinio nuosėdų užterštumo lygio pokyčius visų nagrinėjamų elementų atžvilgiu. Vieno iš tokių indikatorių – suminio užterštumo rodiklio Zd verčių statistinė analizė ir erdvinė interpoliacija leido ne tik nustatyti statistiškai patikimą hidromechaninio ežero valymo įtakotą metalų ir metaloidų pokyčių reikšmingumą naujai susiformavusiame paviršiniame dugno nuosėdų sluoksnyje, bet ir pademonstruoti erdvinį šių elementų perskirstymą dugno paviršiaus plote. Disertacijoje pateikiama informacija yra ypač aktuali vertinant Lietuvos ežerų būklę, planuojant ežerų dugno nuosėdų šalinimo darbus ir nustatant jų tikslingumą.
Ross, Jason E. "A Coastal Monitoring Program for a Large Lake Fish Community: The First Step in Capturing Long-term Trends and Addressing Evolving Questions." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1384380417.
Full textMarty, James. "Revegetation of Bulrushes Bolboschoenus Maritimus, Schoenoplectus Acutus, and S. Americanus in Great Salt Lake Wetlands: Seed Biology and Influence of Environmental Factors on Rhizomes." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/5066.
Full textLund, Mark Andrew. "Aspects of the ecology of a degraded Perth wetland (Lake Monger, Western Australia) and implications for Bio manipulation and other restoration techniques." Thesis, Lund, Mark Andrew (1992) Aspects of the ecology of a degraded Perth wetland (Lake Monger, Western Australia) and implications for Bio manipulation and other restoration techniques. PhD thesis, Murdoch University, 1992. https://researchrepository.murdoch.edu.au/id/eprint/51730/.
Full textCollier, Jessica J. "Creating a Spatially-Explicit Habitat Suitability Index Model for Lake Sturgeon (Acipenser fulvescens) in the Maumee River, Ohio." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1525350340081516.
Full textCairns, Stefan H. 1949. "Eutrophication Monitoring and Prediction." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc277850/.
Full textMorillo, 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.
Full textMcCloskey, Erin J. "The Pope Estate historic preservation plan : Tallac Historic Site, south Lake Tahoe, California." Virtual Press, 2006. http://liblink.bsu.edu/uhtbin/catkey/1355591.
Full textDepartment of Architecture
Wibbing, Jan [Verfasser]. "Utilization of alternative phosphorus resources by regenerative agriculture practice based on mycorrhizal fungi and biostimulants for restoration of Lake Chamo watershed, Ethiopia / Jan Robert Wibbing." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2020. http://d-nb.info/1220775169/34.
Full textPalmer, Rebecca Ann. "Natural Resources Internship with the U.S. Army Corps of Engineers at Caesar Creek Lake." Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1375873696.
Full textBuckallew, Robin Randolph Dickson Kenneth L. "Comparison of bare root vs. potted plants, species selection, and caging types for restoration of a prairie wetland, and quantitative analysis and descriptive survey of plant communities and associations at Lewisville Lake Environmental Learning Area (LLELA), Lewisville, TX." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3700.
Full textRaulinaitis, Mindaugas. "Hidromechaninio ežerų valymo įtaka metalų ir metaloidų pasiskirstymui dugno nuosėdose." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121227_090639-11076.
Full textAlthough hydromechanical lake remediation projects have been carried out over several decades, there still is a lack of evidence about the changes in environmental status after such projects, while scientific literature regarding redistribution of metals and metalloids caused by hydromechanical bottom sediment removal is especially scarce both in Lithuania and in other countries. Research of the dissertation consisted not only of extensive geochemical field work and laboratory analysis, but also methods of mathematical statistics and spatial interpolation. Results of the research and their analysis allowed to conclude that hydromechanical lake remediation results in changes of the contents of metals and metalloids of interest and their spatial redistribution in lake bottom sediments, which are specific to each metal and metalloid, thus cumulative indicators should be used to assess overall changes in sediment quality of remediated lakes. Calculation and statistical analysis of on of such indicators - total sediment contamination index (Zd) and surface interpolation of its values allowed to evaluate statistical significance of changes in contamination degree of the newly formed surface sediment layer and to assess cumulative spatial redistribution of metals and metalloids caused by hydromechanical lake remediation. Data provided in the dissertation is especially significant in preparation and design of future sediment removal projects and in determining their feasibility.
Rohal, Christine B. "Invasive Phragmites australis Management in Great Salt Lake Wetlands: Context Dependency and Scale Effects on Vegetation and Seed Banks." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7228.
Full textMiranda, Marcela Aparecida Campos Neves. "Medidas de mitigação para controle e manejo das florações de cianobactérias em um sistema raso tropical." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6500.
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Florações de cianobactérias são consequência principalmente da eutrofização de ambientes aquáticos que afeta a qualidade e compromete o uso da água para diversas finalidades. A restauração de sistemas aquáticos eutrofizados é um dos principais desafios da limnologia atual. Nosso objetivo foi identificar as principais causas do processo de eutrofização e ocorrência de florações de cianobactérias e testar a eficácia e aplicabilidade do uso combinado de coagulantes e adsorventes de P em fase sólida no controle da eutrofização e florações em um lago tropical raso. O estudo foi conduzido no lago do Museu Mariano Procópio, localizado em Juiz de Fora – MG e dividido em quatro fases. As duas primeiras fases compreendem uma análise sistêmica do lago. Na primeira, buscou-se conhecer a dinâmica da comunidade fitoplanctônica a fim de entender a dominância de cianobactéria deste sistema. Na segunda, foram avaliados os aportes de fósforo (P) para o sistema. Na terceira fase foram realizados experimentos em laboratório, para verificar a eficácia de diferentes coagulantes e lastros para remoção de cianobactérias. E na quarta fase foram realizados experimentos em mesocosmos no lago, para testar o controle da eutrofização e florações de cianobactérias. A análise sistêmica mostrou dominância de diferentes espécies de cianobactérias e que as altas concentrações de nutrientes presentes do sistema vêm principalmente de contribuição externa. O uso combinado de coagulantes e lastros foi eficiente para a remoção de biomassa de cianobactérias, porém foi dependente da espécie. Nos experimentos com mesocosmos, foi observada uma forte redução de Clorofila a (Chl a 85%) e fósforo total (TP 78%) (p <0,0010) em todos os tratamentos, porém estas reduções não se mantiveram ao longo do tempo. Para mitigar as florações de cianobactérias deste sistema, será necessário o controle das fontes externas de nutrientes e um ajuste na técnica de coagulante-lastro para manter a clorofila e o fósforo total em concentrações reduzidas por mais tempo.
Cyanobacterial Blooms are mainly a consequence of eutrophication of aquatic environments that affect the water quality and compromise the use of water for various purposes. The restoration of eutrophic aquatic systems is one of the main challenges of today's limnology. Our objective was to identify the main causes of the eutrophication process and the occurrence of cyanobacterial blooms in a shallow tropical lake, and to test the efficacy and applicability of the combined use of coagulants and adsorbents of P in solid phase for the control of eutrophication and cyanobacteria blooms in a tropical shallow system. The study was conducted in the lake of the Mariano Procópio Museum, located in Juiz de Fora - MG and divided into four phases. The first two phases comprised a systemic analysis of the lake. The first one sought to know the dynamics of the phytoplankton community and to understand the causes of the cyanobacteria dominance in this system. In the second one, the main contributions of phosphorus to the system and the general balance of P were evaluated. In the third phase, laboratory experiments were carried out to evaluate the efficacy of different coagulants and ballasts for the removal of cyanobacteria. Last, in the fourth phase experiments were carried out in mesocosmos in the lake to test the control of eutrophication and cyanobacterial blooms. The systemic analysis showed the dominance of different species of cyanobacteria and that the high concentrations of nutrients present in the system come mainly from external contribution. The combined use of coagulants and ballasts was efficient for the removal of cyanobacteria biomass, but it is dependent on the species pool. In the experiments with mesocosms, a strong reductions of chloropyll a (Chl a) 85% and total phosphorus (TP) 78% (p < 0.001) were observed in all treatments, however these reductions were not lasting. To mitigate the cyanobacterial blooms of this system, it will be necessary to control the external sources of nutrients and also an adjustment in the coagulant-ballast technique to keep Chl a l and TP in reduced concentrations for longer time.
Ferreira, Tiago Finkler. "O papel das macrófitas submersas sobre a qualidade da água, restauração e conservaçao de lagos rasos subtropicais : estudo de caso, a Lagoa Mangueira, RS." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/18978.
Full textThe aim of this Thesis was to evaluate the role of the submerged macrophytes with respect to water quality and, interactions with phytoplankton and nutrient cycling in the large shallow subtropical Lake Mangueira, southern Brazil. To achieve these goals, this work counts with approaches in situ, in laboratory and aplication of ecological modelling to verifify the influence of the submerged vegetation over the dynamics of the ecosystem, whose water is intensively explored to irrigate rice crops around its surrounding area. Over the 200km of the lake littoral perimeter, several submerged macrophyte beds are established. The analysis of water quality and phytoplankton structure along a macrophyte-pelagic gradient revealed lower concentration of orto-phosphate (PO4) and chlorophyll-a (Chlo-a) in the vegetated area. At the pelagic zone, the higher Chlo-a values were corroborated by the higher biomass of phytoplankton, which was mostly composed by cyanobacteria species. Such evidences suggest the antagonistic relantionship between macrophytes and phytoplankton as nutrient competition and allelopathy. Experiments of coexistance, in microcosms, with 4 native submerged macrophytes and a toxic strain of the cyanobacteria Microcystis aeruginosa proved the occurrence of these mechanisms. The experiments included different levels of light intensity and orto-phosphate concentration (PO4) in the medium aiming to identify thresholds in which allelopathy is likely to occur. The macrophytes Cabomba caroliniana and Myriophyllum spicatum showed allelopathic potential while the species Ceratophyllum demersum and Egeria densa showed a high capacity for PO4 absorption (±0.35 mg.g-1d-1), being able to reduce this nutrient to lower levels than 0.05 mg.L-1. Another experimental approach was carried out to parameterize the leaching of nutrients and carbon from 5 macrophytes under decaying process. Moreover, ecological modelling was utilized to simulate the growth of submerged macrophytes in subtropical and temperate lakes. This was done aiming to evaluate the possibility of resilience enhancement of the clear water state in lakes of low latitude because the plants can grow continuously, in contrast with temperate lakes, where they die seasonally due to rigorous winter. In addition, simulation of scenarios considering the collapse of the vegetation in Lake Mangueira because of water uptake for rice crops were carried out in oder to provide elements for the ecosystem management. Through this approach, it was possible to forecast possible eutrophication thresholds for phytoplankton blomming. In conclusion, the results proved the the postive feed-back mechanisms exerted by the submerged macrophytes on the water quality and the importance of their ecological functions to the trophic state of Lake Mangueira. In addition, such information serve as theoretical and practical basis for the management, restoration and conservation of subtropical and tropical shallow lakes.
Buckallew, Robin R. "Comparison of Bare Root vs. Potted Plants, Species Selection, and Caging Types for Restoration of a Prairie Wetland, and Quantitative Analysis and Descriptive Survey of Plant Communities and Associations at Lewisville Lake Environmental Learning Area (LLELA), Lewisville, TX." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3700/.
Full textThålin, Höök Karin. "Inventering av kulturhistoriskt intressanta byggnader och miljöer, västra Möckelnstranden, Karlskoga." Thesis, Linnaeus University, School of Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-8396.
Full textThe report is a building evaluation of an area south of Karlskoga`s urban area on the west side of the lake Möckeln, known as the western Möckelnstranden. The evaluation is carried out on the behalf of Karlskoga municipality. The goal of the evaluation that is based on a mission statement is to create a basis for Karlskoga municipality for a detailed plan and exploitation of the area. The inventory contains suggestions on what should and should not be done with the environment and its buildings.
Rapporten är en byggnadsinventering av ett område som ligger söder om Karlskoga tätort på västra sidan av sjön Möckeln, s.k. västra Möckelnstranden. Inventeringen görs på uppdrag av Karlskoga kommun. Målet med inventeringen är att utifrån en uppdragsbeskrivning skapa ett underlag åt Karlskoga kommun inför en detaljplaneläggning och exploatering av området. Inventeringen innehåller förslag på vad som bör och inte bör göras med områdets miljö och dess bebyggelse.
Tsukashita, Masaki. "Spironolactone alleviates late cardiac remodeling after left ventricular restoration surgery." Kyoto University, 2009. http://hdl.handle.net/2433/124293.
Full textYoshikawa, Eiji. "Carvedilol may alleviate late cardiac remodeling following surgical ventricular restoration." Kyoto University, 2011. http://hdl.handle.net/2433/135379.
Full textBuse, Caren. "For the flute : published songs and the amateur recorder player in London in the late seventeenth and early eighteenth centuries." Thesis, Bangor University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251164.
Full textChiu, Wei-chun. "Morality as politics : the restoration of Ch'eng-Chu Neo- Confucianism in late imperial China /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487777901659599.
Full textYilmaz, Yavuz Salim. "Restoration Project Of A Traditional House In Camiserif District 5227 Str. No:14 Mersin." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606336/index.pdf.
Full textJardine, Mark. "United societies : militancy, martyrdom and the presbyterian movement in Late-Restoration Scotland, 1679 to 1688." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3842.
Full textFischer, Jason L. "Evaluating Habitat Restoration in the St. Clair-Detroit River System." University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1576160707431634.
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