Perubahan Penggunaan Lahan dan Dampaknya Terhadap Koefisien dan Volume Limpasan Banjir Di Das Keureuto, Provinsi Aceh (Land-Use Changes and Their Impact on Runoff Coefficient and Flood Volume in the Keureuto Watershed, Aceh Province)
Year: 2025
Type: article
Abstract: Land-use changes significantly impact watershed hydrology, including increased surface runoff and flood risk. This study uses the Soil Conservation Service–Curve Number (SCS-CN) method to evaluate the impact of land-use changes on the runoff coefficient (C) and flood runoff volume in the Keureuto Watershed in Aceh Province. . Land-use data were analyzed from four time periods: 1990, 2000, 2010, and 2024. Rainfall, soil type, and elevation data were used to calculate CN values, runoff volume, and the runoff coefficient. A land-use transition matrix was used to identify land use conversion patterns, and integrated them into a geographic information system (GIS) for spatial analyses. The results show significant increases in the area of settlements (82.9%), open land (77.4%), and shrubland (45.2%), while primary and secondary forests areas declined by 21.1% and 23.1%, respectively. These changes caused the Curve Number value to increase from 69.5 in 1990 to 71.9 in 2024. The spatial distribution analysis shows increases in areas with medium (28%) and high (6.5%) CN values. In line with the 46.6% increase in rainfall, the surface runoff volume increase from 1,704,979,578 m³ to 2,572,791,394 m³, or by 46.7%. In parallel, the runoff coefficient (C) increased from 0.928 to 0.955, indicating decreased infiltration capacity due to land use changes. These findings suggest that land-use changes directly increase CN and C values, contributing to higher surface runoff and flood risk in the Keureuto Watershed. Therefore, sustainable land-use management and mitigation strategies, such as forest conservation and revegetation, are necessary to control CN values and reduce the runoff coefficient.
Authors: Prodi Magister Pengelolaan Sumberdaya Alam dan lingkungan Universitas Almuslim, Cut Nofita, Cut Azizah, Halus Satriawan, Ridwan Iriadi, Prodi Ilmu Tanah, Universitas Khairun, Sarif Robo, Misnawati Misnawati, Badan Riset dan Inovasi Nasional
Institutions: Universitas Almuslim, Khairun University
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4415238000