Process Analysis and Risk Assessment of Longshan Debris Flow Based on FLO-2D
Using numerical method to simulate the movement of debris flow can make up for the deficiency of traditional debris flow risk assessment methods,and effectively obtain the influence range and risk distribution of debris flow.Taking Longshan debris flow as an example,the debris flow simulation was carried out by FLO-2D software combined with the fluid physical and mechanical parameters of debris flow which obtained from field investigation and test.Simulation results show that the flow rate of Longshan debris flow ranges from 1.0 to 9.3 m/s,and the maximum depth is 4.5m.Complex energy dissipation and acceleration processes are generated at the intersection of two gullies.Combined with the simulation results,the regional risk distribution of debris flow in Longshan was obtained by taking the kinetic energy of debris flow as the basis of destruction evaluation and considering the vulnerability factor,among which the high-risk area is mainly distributed in gully and gully mouth area,accounting for about 15.3％.The simulation results well reflect the movement and threat range of debris flow.
debris flowFLO-2Dkinetic modelrisk assessmentLongshan area of Fuding Ctiy
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