Influência de parâmetros morfométricos e do uso e ocupação da terra na densidade de cianobactérias em bacias hidrográficas de captação de água para abastecimento público
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2017-09-26
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Universidade Federal de Goiás
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The quality of water and the development of cyanobacteria in water courses results from the
use and occupation of land and the physical parameters of the river basin. Therefore, the
objective of this work was to study the water quality and the influence of physical-chemical,
morphometric, land use and occupation and soil loss on the development of cyanobacteria in
15 water catchment basins for public water supply, in the period from 2007 to 2016. To
evaluate the correlation between the parameters, the non-parametric regression model Kernel
Regression with Mixed Data Types was used, at a significance level of 10% with p-value <0.1.
The IQAACP and IQACWQI were applied to evaluate the water quality of the abstraction
sources. For IQACWQI, 86% of the basins were classified in the categories between excellent
and regular; and only the stream Lajes and the stream Veredas were classified in at least one
period in the categories poor or very poor. For IQAACP, the IQA1 of the hydrographic basins
analyzed for the first main component was explained by between 29% and 54%. The
reduction of the average density of cyanobacteria promoted lower values of IQA1, and
therefore, better water quality. The IQAp values were lower in relation to the IQA1, improving
water quality. The most significant parameters in the definition of water quality for the first
main component were: dissolved oxygen, biochemical oxygen demand, ammoniacal nitrogen
and turbidity. The correlation of cyanobacteria density was positive with pasture and urban
area and negative with APP vegetation. Positive correlations were found between
cyanobacteria density and physico-chemical parameters (chlorophyll a, pheophytin, water
temperature, ammoniacal nitrogen, nitrate and dissolved inorganic nitrogen). Among
dissolved solids and cyanobacteria density, negative correlation was found for the Meia Ponte
basin and positive for the Samambaia stream basin. Given this scenario, it is necessary to
restore the natural vegetation areas in APP and reduce the anthropic areas, ensuring
availability and quality of water for public supply.
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SOUZA, C. A. Influência de parâmetros morfométricos e do uso e ocupação da terra na densidade de cianobactérias em bacias hidrográficas de captação de água para abastecimento público. 2017. 137 f. Dissertação (Mestrado em Engenharia Ambiental e Sanitária) - Universidade Federal de Goiás, Goiânia, 2017.