Evaluasi Daerah Tangkapan Air Bendungan Way Rarem Terhadap Simpanan Air Waduk Berbasis Citra Landsat
Abstract
This study aims to evaluated condition of the water the catchment area. This study evaluates the condition of the Way Rarem Dam water catchment area agains reservoir water storage using Landsat 7 ETM+ and Landsat 8 OLI imagery. The integration of NDVI and NDWI indices was used to map vegetation density and surface water extent from 2009 to 2025. The results show that the catchment area is dominated by medium to high vegetation density with an average NDVI values of 0.26–0.37, while NDWI values ranging from –0.34 to –0.21 reflect predominantly non-water surfaces. A strong correlation between NDVI and NDWI (R² = 0.719) indicates that vegetation density influences approximately 71.9% of the variation land wetness conditions. The water storage volume reached its maximum capacity in 2020 at 43.66 million m³ than decreased in 2024 to 2025 due to vegetation degradation and sedimentation. These findings emphesize the importance of vegetation cover in maintaining water storage capacity and hydrological stability in the Way Rarem Dam catchment area.
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References
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