Land Use Changes Toward Water Quality Status of Lake Maninjau West Sumatera

¹ Doctoral Program of Environmental Science, School of Postgraduate Studies, Diponegoro University, Semarang, Indonesia
² Department of Biology, Faculty of Science and Mathematics, Diponegoro University, Semarang. Indonesia.
³ Department of Environmental Engineering, Faculty of Engineering, Diponegoro University, Semarang, Indonesia

^* Corresponding author: reni.nastuti@gmail.com

Abstract

The purpose of this research is to review and analyze the relationship between land use and water quality. The research method used is remote sensing image interpretation method, survey method, and spatial based descriptive analysis. The results of land use research included settlements, forests, rice fields, water bodies and shrubs in 1992, 2002, 2012 and 2022, in 1992 settlements 3.82%, 2002 2.87%, 2012 6.9% and in 2022 settlements 8.83%. in 1992 forest 53.59%, in 2002 43.78%, in 2012 49.76% and in 2022 forest 49.17%. in 1992 paddy fields 14.59%, in 2002 21.29%, in 2012 10.96% and in 2022 paddy fields 11.21%. in 1992 water bodies 22.25%, in 2002 22.97%, in 2012 22.38% and in 2022 water bodies 22.19%. Shrubs were 5.75% in 1992, 9.09% in 2002, 10% in 2012, and 8.6% in 2022. The water analysis findings suggest that class 1 water with a score of -15 corresponds to class C water, which is significantly contaminated. Class II with a score of -15 is classified as moderately contaminated, while Class III with a score of -10 is classified as somewhat polluted. Class IV, with a score of -10, is included in Class B, along with the Slightly contaminated category.