顾及地表形变的泥石流灾害危险性评价

Assessment of Debris Flow Hazard Taking Into Account Surface Deformation

泥石流是一种发生迅速、历时短、造成损害大的山地灾害,主要发生在海拔起伏较大的山地,严重影响人民生命和财产安全。罗圈湾沟受“5.12”地震影响产生大量崩滑和松散堆积体,为泥石流发育提供大量物源。基于InSAR技术和FLO-2D数值模拟方法,将二者有机结合,获取100年一遇罗圈湾沟流域泥石流区域危险性分区。研究结果表明:顾及InSAR地表形变的危险性分区中,高危险区域占总危险性面积的6.16%,中危险区域占51.07%,低危险区占42.77%,其中高危险性主要分布在物源、沟道两侧边坡、沟道中上游以及沟口堆积区,为泥石流预警及工程防治工作提供帮助。

Debris flow is a kind of mountain disaster that occurs rapidly, lasts for a short period of time and causes great damage, mainly occurs in mountainous areas with large altitude fluctuations and seriously affects people’s lives and property safety. The impact of the "5.12" earthquake on Luoquanwan ditch has produced a large number of landslides and loose accumulations, which provide a large number of material sources for debris flow development. Based on the InSAR technology and FLO-2D numerical simulation method, this paper organically combines the two to obtain the regional risk zoning of debris flow in Luoquanwan ditch basin in 100 years. The results of the study show that the high risk area accounts for 6.16%,medium risk area accounts for 51.07% and low risk area accounts for 42.77% of the total risk area in the risk zoning taking into account the InSAR surface deformation, among which the high risk is mainly distributed in the physical sources, the slopes on both sides of the gully, the middle and upper reaches of the gully and the accumulation area at the mouth of the gully, which provides help for the early warning and engineering prevention and control of debris flow.