Impact force of post-fire debris flows over erodible beds

After wildfire events, water repellent soil is often found in the subsurface layer of channel bed burnt area. Debris flows generated from basins and ensuing entrainment pose imminent threat to infrastructure human lives. However, fundamental interaction mechanisms debris flow overriding resulting impact force on debris-resisting barriers have yet be elucidated. In this study, physical flume experiments are conducted simulate post-fire entraining a sand with varied wettability. Compared wettable bed, sediment exhibits tremendous increase erosion depth subsequent barrier. The test results demonstrate that can particularly hazardous effects repellency need captured by design criteria resisting basins.