Debris flow gully zoning and risk assessment based on numerical simulation

In order to evaluate the zoning and risk of debris flow gully based on numerical simulation, a set theoretical system technical process quantitative analysis suitable for mountainous towns in southwest China was constructed, taking buildings roads as research objects, view particularity disaster-bearing body types disaster modes. It is mainly divided into three steps: (1) Using FLO-2D model, expressed by intensity index IDF; The simulation results Gully A 7·11 show that area correctly judged 50.02×10 4 m 2 , comprehensive accuracy ω 1.22, maximum IDF can reach 1013.25m 3 /s showing general trend upstream higher than downstream, center drainage channel both sides. data damage ditch city, material vulnerability curve probability exceeding loss constructed. Based establishment database, expected be quantitatively setting different future scenarios. model verification case application city well reflect response mechanism flow, provide scientific basis prevention mitigation threat areas.