LAUSR

AbstractDebris flow is one of the most common natural hazards in the semiarid mountainous areas of the Southeast (SE) Tibetan Plateau. Because of unique geology, geomorphology, and diverse climate conditions, debris-flow susceptibility in the mountainous areas shows significant regionalism. In this study, an index entropy model is adapted for sensitivity analysis of the impact factors of debris flows in the semiarid areas, and the Benzilan-Changbo segment of the upper reaches of the Jinsha River are selected as an area of interest in a case study. Based on the sensitivity analysis, six factors, including, lithology, slope gradient, slope aspect, relative relief, catchment system geomorphologic entropy, monthly average precipitation (June–September), and normalized difference vegetation index (NDVI) are considered debris-flow susceptibility assessment factors. The results show that landform, lithology, and vegetation are the three most important factors affecting the susceptibility of the debris flow in se...