Abstract
A physically based simulator for sediment related disaster has been studied to provide information for warning and evacuation system. The simulator which is fed with rainfall data, elevation data and surface soil information predicts subsurface flow, overland flow, river discharge, initiations of shallow landslides and debris flow, and it is applied to the storm event occurred on 15th Oct. 2013 at Ookanasawa basin of Izu Ohshima Island. The results suggest that the simulator predicts the target phenomena such as river flows, initiation of shallow landslides and debris flow in this basin. The simulator is used to find a critical rainfall condition for initiation of shallow landslide and debris flow using various rainfall. The critical curve which is derived from the relation between simulated shallow landslides and rainfall conditions is confirmed by past disaster records.
