INTEGRATED SIMULATION OF LANDSLIDE AND SEDIMENT RUNOFF EMPLOYING STREAM-TUBE BASED TERRAIN MODEL

Abstract

 The prediction of sediment disasters requires an integrated approach of the rainfall infiltration, slope failure and debris flow. However, in order to predict slope failure accurately, slip surface prediction has been difficult to calculate on the complex catchment topography. Therefore, the prediction of associated debris flow and sediment runoff are also difficult. In this study, we introduce a stream-tube-based terrain partitioning method to treat rainfall infiltration, and slip surface analysis and debris flow simultaneously. The results of the application to a cathment that was damaged by the torrential rainfall in northern Kyushu in 2017, the damage around the main river was well reproduced.