Assessment of landslide susceptibility using GIS-based evidential belief function in Patu Khola watershed, Dang, Nepal

摘要: Patu Khola watershed lies in Dang Valley of West Nepal. The rocks belonging to the Precambrian Lesser Himalaya and Miocene Siwalik cover northern portion watershed, while southern flat area is covered by Quaternary river terraces. basin disrupted two regional scale thrusts (Bhotechaur Thrust Kapurkot Thrust) several imbricate faults making it prone instabilities. valley heavily populated as growing population has forced people dwell such risky zone. Thus, very essential develop a landslide hazard map this basin. In respect, we have used an evidential belief function (EBF) model GIS environment know different landslide-susceptible zones watershed. For this, inventory consisting 279 types landslides was generated from published topographic maps, aerial photograph, Google Earth image interpretations detailed filed survey. From mapped landslides, 80 % were randomly selected for developing model, remaining 20 validating model. Twelve causative factors considered study. analysis data factor susceptibility region obtained using EBF evaluated under curve (AUC) success prediction rate. verification result showed that performed well with rate 85.13 %, predictive accuracy 86.42 %. produced can be useful general land-use planning, provide information planners adaptation appropriate mitigating measures landside hazards