基于FLO-2D的龙山泥石流过程分析及危险性评价  

Process Analysis and Risk Assessment of Longshan Debris Flow Based on FLO-2D

作　　者：杨运林 Yang Yunlin(Fujian Geological Engineering Investigation Institute,Fuzhou,350002)

机构地区：[1]福建省地质工程勘察院,福州350002

出　　处：《福建地质》2024年第4期306-312,共7页Geology of Fujian

基　　金：福建省自然科学基金项目“崩岗侵蚀灾害数据库建设及其成因控制理论研究”。

摘　　要：利用数值方法模拟泥石流的运动过程可以弥补传统泥石流危险性评价方法的不足,并有效地获取泥石流的影响范围及危险性分布。以福鼎龙山泥石流为例,通过FLO-2D软件,结合现场调查、试验得出的泥石流流体物理力学参数,开展泥石流模拟工作。模拟结果显示,福鼎龙山泥石流流速为1.0~9.3 m/s,最大深度为4.5 m,2处冲沟在沟口交汇处产生复杂的能量耗散及加速过程。根据模拟结果,以泥石流动能作为破坏性评价依据,考虑易损性因子,建立动能破坏性评价模型,获取了龙山泥石流区域危险性分布,其中高危险区主要分布于沟道及沟口区域,面积占比约15.3%。模拟成果总体上较好地反映了泥石流的运动情况及威胁范围。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.

关 键 词：泥石流 FLO-2D 动能模型 危险性评价 福鼎龙山 

分 类 号：P642.23[天文地球—工程地质学]