Abstract
Recently, debris flow has occurred so frequently due to abnormal heavy rainfall. Although various studies have been conducted tosimulate the topographic behavior of debris flow, geometric effect such as the shapes of slope side has been insufficient. In this study,simulations were conducted with FLO-2D, the commercial software to be recommended by FEMA to simulate debris flow. And tar-get geometries are selected as flatbed, square shape, trapezoidal shape and V-shape. Firstly FLO-2D was verified by the comparisonwith USGS debris flow experiments (Iverson, 2010). The comparisons showed good agreements in term of the velocity range and thepropagation length of debris flows. Furthermore, the concept of HAZUS-HM risk analysis was used to assess the vulnerabilities of thestructures by the impact of the debris flow. Simulated results were confirmed debris flow behavior to be changed due to the geometrytype. Behavior of debris flows were analyzed according to the maximum depth, velocity, propagation length and vulnerabilities of thestructures by the debris flow. This study would be practical to provide quantitatively the spatial distribution of hazard caused by debrisflow.Key words : Debris flow, FLO-2D, HAZUS-HM, Topographic feature
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