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Master's Dissertation
DOI
https://doi.org/10.11606/D.18.1990.tde-22092022-114010
Document
Author
Full name
Florimar de Jesus Aranha
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1990
Supervisor
Committee
Tundisi, Jose Galizia (President)
Teixeira, Clovis
Tundisi, Takako Matsumura
Title in Portuguese
Influência de fatores hidráulicos e hidrológicos na composição e biomassa do fitoplâncton, em curto período de tempo, na Represa de Barra Bonita - SP
Keywords in Portuguese
engenharia hidráulica e sanitária
Abstract in Portuguese
Um estudo de curto período (15 dias) foi realizado na Represa de Barra Bonita (rio Tietê e Piracicaba) estado de São Paulo, de 10 a 24 de março de 1988. Com finalidade principal de conhecer a comunidade fitoplanctônica, frente aos mecanismos de funcionamento de represas em curto período de tempo. Foram realizadas amostragens diárias às 09;00 horas em uma estação fixa localizada a 1.7 Km montante da barragem. Para determinar ciclos diários de fatores ecológicos e da distribuição vertical e temporal principais fatores físicos químicos e biológicos. Foram realizadas amostragens na coluna d'água. com coletas para obtenção de parãmetros hidrográficos e biológicos. Neste período ocorreu precipitação de 93.7 mm em 3 dias seguidos, ventos de sudeste que alcançaram velocidade de 25.2 km/h, e vazão vertida de 1550.6 m3/s distribuída em 4 dias consecutivos. O sistema apresentou-se polimitico com curtas microestratificações nos primeiros 2 metros de profundidade notada a partir das 09:00 horas. O fitoplâncton apresentou 7 classes com 22 gêneros, sendo que as classes em ordem decrescente em número de células ou filamentos, foram Cryptophyceae, Bacillariophyceae, Cyanophyceae, Euglenophyceae, Chlorophyceae, Dinophyceae e Zygnemat.ophyceae. Houve perda de biomassa e de organismos fitoplanctônicos do sistema, como também de fósforo, enquanto permaneceram abertos os vertedouros. Foi também observado um grande número de colónias de Microcystís partidas e filamentos de Melosíra sem o conteúdo plasmático. O sistema neste curto período de tempo apresentou respostas frente aos pulsos das condições meteorológicas (vento e precipitação principalmente) e ao regime de operação (vazão turbinada e vertida), com manifestação de quatro fases distintas, sendo que para as duas primeiras o vento e a precipitação foram as principais funções de força, enquanto a terceira e a quarta foram marcadas pelo regime de operação.
Title in English
Influence of hydraulic and hydrological factors on the composition and biomass of phytoplankton, in a short period of time, in the Barra Bonita Dam
Keywords in English
hydraulic and sanitary engineering
Abstract in English
A short-term (15 days) study was carried out at the reservoir of Barra Bonita (rivers Tietê and Piracicaba) in the state of São Paulo, from 10 to 24 March 1988. The principal aim was to gain an understanding of the phytoplankt on community with reference to the mechanisms of functioning of the reservoir during short- periods of time. Sampling was carried out daily at 09:00 hours at a fixed point, situated 1.7km from the dam Samples for the entire water column were analysed to determine the diurnal cycles of ecological factors and the vertical and temporal distribution of the principal physical, chemical and biological parameters. During this period precipitation of 93.7mm occurred on three consecutive days, with winds f'rom the south-east which reached a speed of 25.2 km/h and out-flow of 1.550.6 m3/s during four consecutives days. The system was polymistic with brief periods of microstratification in the upper two metres of water being recorded after 09:00 hours. Seven classes of phytoplankton consisting of 22 genera, were found being in order of decreasing abundance of cells or f'ilaments, Cryptophyceae, Bacillariophycea, Cyanophyceae, Euglenophyceae, Chlorophyceae, Dinophyceae e Zygnemat.ophyceae. Loss f'rom the system of phytoplankt.on biomass as well as phosphorous, was recorded whíle the sluices were open. Also many ruptured colonies of Hícrocystís and empty colonies of Helosira were observed. The system duríng this short period of time demonstrated reactions to the changes in meterological conditions (principally wind and precipitation) and the operating regime of the dam (turbine flow and out.-f'low). Four distinct phases were distinguished: wind and precipitation were the principal forcing functions during the first two, while lhe third and f'ourth were dominated by the operating regime.
 
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Publishing Date
2022-09-22
 
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