Debris flow susceptibility assessment based on an empirical approach in the central region of South Korea

摘要: Abstract Many debris flow spreading analyses have been conducted during recent decades to prevent damage from flows. An empirical approach that has used in various studies on advantages such as simple data acquisition and good applicability for large areas. In this study, a GIS-based model was developed at the University of Lausanne (Switzerland) is assess susceptibility. Study sites are classified based types soil texture or geological conditions, which can indirectly consider geotechnical rheological properties, supplement weaknesses Flow-R neglects local controlling factors. The mean travel angle each classification calculated inventory map. susceptibility assessed changes flow-direction algorithm, an inertial function with 5-m DEM resolution. A simplified friction-limited applied runout distance analysis by using appropriate corresponding velocity limit 28 m/s. most algorithm combinations derived highest average efficiency sensitivity finally determined applying confusion matrix results assessment. proposed schemes be useful assessment both study area central region Korea, similar environmental factors topography rainfall characteristics area.