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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estrutura e dinâmica da comunidade fitoplanctônica dos reservatórios Billings e Guarapiranga, SP, Brasil. / Billings and Guarapiranga reservoirs (SP, Brazil): phytoplankton community structure and dynamics.

Gemelgo, Marcina Cecilia Ponte 02 December 2008 (has links)
Os reservatórios Billings e Guarapiranga integram uma das principais fontes de abastecimento público da cidade de São Paulo, suprindo água para milhões de pessoas. O aporte de nutrientes em corpos hídricos, advindos de efluentes domésticos e industriais, fertilizantes agrícolas, leva à eutrofização das águas propiciando condições ideais para a proliferação do fitoplâncton. Os objetivos do trabalho foram acompanhar a dinâmica da comunidade fitoplanctônica durante um ciclo sazonal e verificar a influência das variáveis físicas e químicas sobre a estrutura dessa comunidade. A maior densidade (ind.mL-1) da comunidade fitoplanctônica em ambos os reservatórios, foi representada por organismos das classes Chlorophyceae e Cyanobacteria, sendo a última dominante no reservatório Billings e abundante no reservatório Guarapiranga. Os fatores ambientais que interferiram na dinâmica da comunidade fitoplanctônica, em ambos os reservatórios, foram elevados valores de temperatura da água, pH e nutrientes. / Billings and Guarapiranga reservoirs are part of the main public water supply of São Paulo city, supplying water to millions of people. The nutrient input to hidric resources from domestic and industrial effluents, fertilizers causes eutrophication, thus creating ideal conditions to phytoplankton blooms to occur. The objectives of the present work were to follow up the phytoplankton community along one seasonal cycle and to identify the influence of physical and chemical parameters of the water on the community structure. The greatest phytoplankton density (ind.mL-1) in both reservoirs was due to individuals of Chlorophyceae and Cyanobacteria classes, the last being dominant in Billings reservoir and abundant in Guarapiranga reservoir, be it rainy or dry season. The environmental factors that interferred in phytoplankton dynamics were high temperature values, pH and nutrients, in both reservoirs.
2

Estrutura e dinâmica da comunidade fitoplanctônica dos reservatórios Billings e Guarapiranga, SP, Brasil. / Billings and Guarapiranga reservoirs (SP, Brazil): phytoplankton community structure and dynamics.

Marcina Cecilia Ponte Gemelgo 02 December 2008 (has links)
Os reservatórios Billings e Guarapiranga integram uma das principais fontes de abastecimento público da cidade de São Paulo, suprindo água para milhões de pessoas. O aporte de nutrientes em corpos hídricos, advindos de efluentes domésticos e industriais, fertilizantes agrícolas, leva à eutrofização das águas propiciando condições ideais para a proliferação do fitoplâncton. Os objetivos do trabalho foram acompanhar a dinâmica da comunidade fitoplanctônica durante um ciclo sazonal e verificar a influência das variáveis físicas e químicas sobre a estrutura dessa comunidade. A maior densidade (ind.mL-1) da comunidade fitoplanctônica em ambos os reservatórios, foi representada por organismos das classes Chlorophyceae e Cyanobacteria, sendo a última dominante no reservatório Billings e abundante no reservatório Guarapiranga. Os fatores ambientais que interferiram na dinâmica da comunidade fitoplanctônica, em ambos os reservatórios, foram elevados valores de temperatura da água, pH e nutrientes. / Billings and Guarapiranga reservoirs are part of the main public water supply of São Paulo city, supplying water to millions of people. The nutrient input to hidric resources from domestic and industrial effluents, fertilizers causes eutrophication, thus creating ideal conditions to phytoplankton blooms to occur. The objectives of the present work were to follow up the phytoplankton community along one seasonal cycle and to identify the influence of physical and chemical parameters of the water on the community structure. The greatest phytoplankton density (ind.mL-1) in both reservoirs was due to individuals of Chlorophyceae and Cyanobacteria classes, the last being dominant in Billings reservoir and abundant in Guarapiranga reservoir, be it rainy or dry season. The environmental factors that interferred in phytoplankton dynamics were high temperature values, pH and nutrients, in both reservoirs.
3

Destratifikace vodních nádrží / Destratification of Reservoirs

Sluše, Jan January 2021 (has links)
This doctoral thesis is focused on design of new equipment for aeration of water surface with low depth of water column. Aeration is one of ecological preventive methods to prevent growth of cyanobacteria. Increase of dissolved oxygen content in water mass leads to support of the growth of organisms which are disadvantaged by impossibility of movement in water mass and thus also to support biodiversity. Given biodiversity has a positive effect on water quality because it avoids the outbreak of one species of aquatic organism, in particular of cyanobacteria. Designed aeration equipment uses membrane formed by hollow fibre to transport oxygen into the water. When aeration dissolution of oxygen occurs directly on the membrane surface which prevents air leak in the form of bubbles. This type of aeration has low operating costs and high efficiency of input of the oxygen into the water. Distribution in the aquatic environment is ensured by special boat. This boat is moving on the water surface and the technology is installed on the upper deck. The aeration is carried out by an aeration module situated in the water. The movement of the boat is partially ensured by autonomous control.

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