雅砻江中游老里沟坡面型泥石流成因机制及危险度评价

坡面泥石流是山地分布最广,出现频率最高的灾害现象。基于野外现场调查及室内实验分析,阐述了老里沟坡面型泥石流的基本特征及形成机制,并结合泥石流动力特征参数进行了危险度评价。研究结果表明:滑坡体上坡面侵蚀沟道发育,为坡面型泥石流的形成提供了强有力的条件;降雨是诱发老里沟坡面流的主要因素;老里沟泥石流类型为高中频、小规模、粘性、暴雨型泥石流,属于中度危险泥石流沟。

Formation Mechanism and Risk Assessment of the Laoli-Gully-Debris Flow on Slope,the Middle Reaches of the Yalong River

Debris flow on slope is the most widely distributed and most frequent disaster in the mountains. Based on field investigation and lab analysis, this paper elaborates the basic characteristics and formation mechanism of Laoli debris flow, and evaluates the debris flow risk in combination with the dynamic characteristic parameters. Research results show that the slope erosion gully on landslide is developed, which provides powerful conditions for the formation of debris flow on slope;Rainfall is the main triggering factor of Laoli debris flow;The type of Laoli debris flow is high?frequent, small?scale, viscous, rainstorm debris flow, which belongs to the moderate dangerous of debris flow gully.