川西南高中山地貌区受到构造侵蚀剥蚀影响,河流两岸地形切割强烈、山高坡陡、沟谷纵横,泥石流沟发育,类型多样。其中一类泥石流尽管流域面积不大,且沟道短,但由于其坡降大,泥石流发生后,其势能较大,其影响范围具有很大不确定性,给防治工作带来很大难度,对人民群众生命财产和工程建设影响较大。以丹巴县革什扎镇柯尔金村呷业沟泥石流为例,通过对其主要发育特征进行调查分析,在现场和室内试验成果基础上,采用数值模拟技术并对其危险性进行评价,并根据泥石流的堆积深度及堆积深度与流速的乘积进行危险高低的界定,对类似泥石流特征分析危险性评价具有借鉴意义。

In the mountainous area of southwestern Sichuan, influenced by tectonic erosion and denudation, the terrain on both sides of the rivers is strongly cut, with high mountains, steep slopes, and crisscrossing valleys. Debris flow gullies are well-developed, showing diverse types. Although one type of debris flow has a small drainage area and short gully channels, due to its steep slope gradient, it possesses high potential energy once occurred. The impact range of this type of debris flow is highly uncertain, posing significant challenges to prevention and control efforts. It also has a considerable impact on people's lives and property, as well as engineering construction. Taking the debris flow in Gaye Gully, Keljin Village, Geshzha Town, Danba County as an example, through investigation and analysis of its main development characteristics, numerical simulation technology is used to evaluate its danger based on on-site and indoor test results. The danger level is defined based on the accumulation depth of the debris flow and the product of the accumulation depth and flow velocity. The study has reference significance for analysing the risk evaluation of similar debris flow characteristics.