Some Considerations for Using Numerical Methods to Simulate Possible Debris Flows: The Case of the 2013 and 2020 Wayao Debris Flows (Sichuan, China)

Using a numerical simulation method based on physical equations to obtain the debris flow risk range is important for local-scale assessment. While many models have been used reproduce processes after occurrence, their predictability in potentially catastrophic scenarios has mostly not evaluated detail. Two single-phase and two two-phase were Wayao event 2013. Then 2020 was predicted by four with same parameters The depth distributions of source deposition fan mapped visual interpretation, electric resistivity surveys, field measurements, unmanned aerial vehicle (UAV) surveys. digital elevation model (DEM), rainfall data, other collected. These can geometry thickness distribution However, predictions runout are quite different from actuality 2020. performance usability these compared discussed. This could provide reference selecting assess debris-flow risk.