RELATIONSHIP BETWEEN LAND USE AND OCCUPATION AND WATER QUALITY IN THE CUBATÃO RIVER BASIN, SANTA CATARINA STATE, BRAZIL
DOI:
https://doi.org/10.56238/arev7n11-160Keywords:
Water Quality Index, Multiple Linear Regression, Trophic State Index, Joinville, Braço RiverAbstract
The Cubatão River watershed, located in Joinville and Garuva, Santa Catarina, Brazil, supplies water to approximately 70% of Joinville’s population. This study examines the relationship between land use, occupation, and water quality in this essential basin. Using satellite imagery, we mapped land use and land cover, followed by multiple linear regression and cluster analyses of water quality data. Findings show that unregulated urbanization and intensive agriculture are key contributors to water quality degradation. Urbanization leads to increased soil sealing, reduced infiltration, and higher surface runoff, which carries pollutants to water bodies. Agriculture, as a major source of nutrients and pesticides, promotes eutrophication and water contamination. Cluster analysis identified distinct groups based on water quality and land use, revealing spatial variability across the basin. These results suggest that specific management approaches tailored to each area’s land use are needed to improve water quality. This study highlights the critical role of soil conservation practices and integrated watershed management in mitigating the negative impacts of land use on water resources, thereby supporting sustainable water quality for the Cubatão River Basin.
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