Numerical Modeling of Debris Flow Originating from Topographic Hollows at Koyalghari and Simaltal Area along Narayangadh-Mugling Highway

Abstract

Assessing debris flow runout is essential for evaluating landslide hazards and developing effective land use plans. This study used the LISEM (Limburg Soil Erosion Model) to analyze debris flow runout based on geotechnical soil parameters. By integrating rainfall-induced failure and runout through physically-based modeling, the study aimed to predict landslide impact areas using forecasted precipitation. Focusing on the Koyalghari and Simaltal areas along the Narayangadh-Muglin road, the model's validation in Simaltal showed substantial agreement with historical runout patterns. For extreme rainfall events, debris flow heights between 0.92 m and 1.1 m were estimated at the highway, indicating potential damage to traffic. The findings highlight the model's reliability in predicting debris flow runout and providing valuable insights for hazard management.