ABSTRACT
Debris flow is a common natural disaster in mountainous areas and often causes severe causalities and property loss. This paper proposed a new debris flow mitigation method based on the small watershed functional map. First, the shallow landslide was automatically identified based on remote sensing spectral characteristics, terrain slope and geometric shape. Second, debris flow run-out effects under rainfall with different return periods were analyzed by combining the debris flow numerical simulation results with different land utilization within the inundated area. Finally, the concept of “small watershed functional map” was put forward innovatively to conduct debris flow comprehensive mitigation. The effectiveness of the employed method was confirmed by performing a case study in Shenshui gully, China. The study can make a significant contribution to the literature because the proposed methods proved reasonable for assessing spatial debris flow run-out effects and can be widely employed for debris flow mitigation to save lives and property.
