Soil erosion prediction and risk assessment using RUSLE model and GIS techniques in the Nangka watershed

Journal of Water and Land Development

article

Yusron Saadi¹  Sus Mardiana²  Eko Pradjoko¹ 

[1] University of Mataram, Faculty of Engineering, Department of Civil Engineering, Center for Disaster Risk Management;Nusa Tenggara I River Basin Organisation

关键词: conservation measures;    erosion hazard level;    GIS techniques;    RUSLE;    soil erosion;    watershed;   

DOI  :  10.24425/jwld.2022.142320

学科分类：农业科学（综合）

来源: Instytut Technologiczno-Przyrodniczego / Institute of Technology and Life Sciences

【 摘 要 】

Soil erosion in the Nangka watershed has always been a matter of concern. Over the last decade, soil erosion has led to continuous environmental problems. A thorough examination of the extent of the problem was required to identify an appropriate soil conservation strategy within the watershed. This study was conducted to observe erosion rates and map out the erosion hazard level. Erosion predictions were analysed by using the Revised Universal Soil Loss Equation (RUSLE) model with the help of ArcGIS software. RUSLE was selected because of its quantitative ability to estimate average annual soil erosion and its compatibility with the GIS interface. The potential hazard of soil erosion was classified and ranked into five class categories as set by the national authority. The results reveal that the Nangka watershed is prone to soil erosion with the annual average values ranging from 1.33 Mg·ha –1 ·y –1 to 2472.29 Mg·ha –1 ·y –1 . High soil erosion rates of 9.8% are in severe (class IV) and very severe (class V) conditions, primarily in the upper course of the watershed. The low annual average of soil erosion (class I and class II), which accounted for 75.95% of the total erosion, mostly took place in the steepness below 35%. The remaining area of 14.25% within the watershed is in moderate condition (class III). It is expected that the results of this study will help the authority in the implementation of soil conservation measures.

【 授权许可】

Unknown