Influence of Land Use and Occupancy on Water Quality in a Stretch of the Piranhas-Açu Semiarid River Basin in Brazil
The inappropriate use and occupation of the environment has led to changes in the physical, chemical, and biological attributes of ecosystems that incorporated living standards that are unsustainable in relation to the maintenance of their quality. Therefore, this work had the following objectives: (1) to evaluate the interference caused by land use and occupation on water quality in the lower part of the Piranhas-Açu river basin, in the semiarid region of Brazil, (2) to identify the most sensitive variables in distinguishing environments through the use of the multivariate technique and, (3) to evaluate the influence of ions on water quality. The study was conducted downstream of the Armando Ribeiro Gonçalves reservoir in 2019, 2020, and 2021, during the dry and rainy seasons. Five collections of water samples were carried out at seven points distributed along the stretch of the river basin to evaluate its physical, chemical, and microbiological attributes. Analyzes were performed for the variables pH, EC, Na+, K+, Ca2+, Mg2+, Cl-, CO32-, HCO3-, TN, ALK, TP, TC, and CL a, totaling 490 samples. To evaluate water quality, multivariate statistics such as principal component analysis (PCA), factor analysis (FA), and cluster analysis (CA) were used. The PCA/FA allowed the formation of three groups used as indicators of water quality involving salinity, alkalinity, and trophicity, which explained 71.93% of the total variance. Seasonality proved to have a strong influence on water quality for the studied variables. Land use and occupation influenced the water quality of the river stretch studied, with anthropization influencing the TP and agriculture influencing the salt contents (Ca2+, Mg2+, Na+, EC, Cl-) and the alkalinity found in water
Year of publication: |
[2022]
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Authors: | Cunha, Maria E. ; Filho, Luis C. A. L. ; Cunha, Rutilene R. ; Silva Rêgo, Lunara Gleika ; Gondim, Joaquim Emanuel Fernandes ; Portela, Jeane Cruz ; Silva, Camilo V. T. ; Batista, Rafael O. |
Publisher: |
[S.l.] : SSRN |
Subject: | Brasilien | Brazil | Landnutzung | Land use | Agrarboden | Agricultural soil | Gewässerbelastung | Water pollution | Gewässerschutz | Water conservation |
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