不同降雨频率单沟泥石流灾害风险评价

Risk assessment of debris flow hazards in different rainfall frequencies

通过对危险度与易损度进行耦合分析,结合GIS技术,得出单沟泥石流不同降雨频率下灾害风险度,最终获得了段河坝泥石流沟不同降雨频率下风险分区.结果表明:段河坝泥石流沟总体属于中偏高风险等级,50年一遇最大泥石流冲出量为36.5×104m3,极高风险区面积为0.01 km2;100年一遇最大泥石流冲出量为196×104m3,极高风险区面积达到0.13 km2.

The risk degree and risk rationalization of debris flow hazards in the Duanheba Gully at different rainfall frequencies were obtained by coupling with hazard degree and vulnerability, combined with GIS and the results showed that the risk level of Duanheba Gully is generally high, the maximum runout amount of debris flow that had occurs once in 50 years is 36.5×10^4 m^3, and the extremely high risk area is 0.01 km^2. The maximum runout amount of debris flow that happens once every 100 years is 196×10^4 m^3 and the extremely high risk area is 0.13 km^2.