拉萨市堆龙德庆区滑坡灾害时空分布规律和孕灾背景分析

Spatiotemporal distribution of landslide disasters and analysis of disasterpregnancy background in Duilongdeqing District,Lhasa City

西藏地质灾害点多面广,防灾形势十分严峻。为探讨高寒高海拔地区滑坡形成的孕灾背景,文章以堆龙德庆区滑坡为研究对象,在系统总结分析研究区滑坡灾害时空分布规律基础上,重点剖析了滑坡发育分布与影响因子的相关性。研究结果显示,堆龙德庆区发育16处滑坡灾害,规模以小型为主,灾害主要集中发生在7—8月,具有沿河谷、断裂构造呈带状分布的特征。区内易滑地层为滑坡的形成提供了物质基础,地形地貌、地质构造、斜坡结构、河流距离、人类工程活动与滑坡具有较好的相关性,是滑坡形成的重要影响因素。滑坡的形成是多种因子综合作用的过程,研究进一步加深了高寒高海拔地区滑坡孕灾条件的认识,可为今后灾害的防治提供参考。

The geological disasters in Xizang are numerous and widespread,and the disaster prevention situation is very challenging.To explore the background of landslide formation in alpine and high-altitude areas,this article takes the landslide in Duilong,Deqing District as the research object,and syestematically summarizes and analyzes the temporal and spatial distribution of landslide disasters in the study area,and focuses on analyzing the correlation between the development and distribution of landslides and the influencing factors.The results show that there are 16 landslide disasters in Duilong,Deqing District,which are mainly small-scale,and mainly occur from July to August,and have the characteristics of belt-like distribution along river valleys and fault structures.The slippery strata in the area provide a material basis for the formation of landslides.The topography,geological structure,slope structure,river distance,and human engineering activities have a good correlation with landslides,which are important influencing factors for landslide formation.The formation of landslides is a process of comprehensive action of various factors,and the research has further deepened the understanding of landslide disaster conditions in alpine and high-altitude areas,which can provide a reference for theprevention and control of disasters in the future.