Movement Characteristics and Hazard Assessment of Debris Flow in Gongbei Gully,Babao Town Under Different Rainfall Frequency Conditions Based on Numerical Simulation of FLO-2D
In recent years,with the continuous increase of rainfall,the frequency of debris flow has shown an upward trend.Its movement and accumulation characteristics and control engineering measures directly determine the hazard degree and affected area of debris flow,and are also the key factors affecting the hazard zonation of debris flow.Therefore,the prediction of debris flow accumulation characteristics and dangerous range under different working conditions has a strong practical application value.FLO-2D,as a two-dimensional software specially used in flood and debris flow simulation,can analyze the movement characteristics of debris flow completely,and can be used in flood hazard simulation and risk assessment.It can calculate the velocity and depth of fluid movement,and reasonably estimate the submerged area.Taking Gongbei trough gully debris flow as an example,based on detailed field investigation and finding out the types,distribution characteristics,storage of debris flow sources and the environment for hazard breeding in the basin,this paper simulated and analyzed the movement characteristics of Gongbei trough gully debris flow in different rainfall frequencies(10%,5%,2%and 1%),determined the threatening range,accumulation depth and velocity of debris flow,and evaluated the hazard zonation of debris flow disaster with the index of debris flow intensity.It can provide technical basis for monitoring and early warning and risk control of debris flow in Gongbei trough,and provide scientific basis and reference suggestions for debris flow disaster prevention and territorial spatial planning in this area or other Qilian mountain towns.
Debris flowFLO-2DNumerical simulationRisk assessmentBabao Town
NETL
NSTL
万方数据
