湖南省降雨型滑坡灾害发生的关键性因子研究

Study of the Key Factor of the Rainfall Type Landslide Hazards in Hunan Province

选用湖南省1∶5万地质灾害详查数据及省气象台提供的雨量数据(2013—2017年),运用确定性系数即CF分析法进行了分析,得出高程、坡度、坡向、坡度曲率即坡型、工程地质岩组与岩性以及人类工程活动等不同的影响因子对降雨型滑坡产生的影响。结果表明,在高程方面,400~800 m区间是滑坡的重要敏感发生区域;在坡度方面,滑坡主要发生在10°~35°之间;在坡向上,朝南向的斜坡最易发生滑坡;在坡型上,凹形坡比凸形坡更容易发生滑坡。除此之外,人类工程活动也对滑坡的发生具有重要的影响作用。

Selecting and utilizing 1∶50 000 detailed geological hazard survey data and the rainfall data(2013-2017)of Hunan Province offered by Hunan Meteorological Station.Applying the deterministic coefficient(CF analysis method)to analyze and conclude how do altitude,gradient,slope direction,slope curvature,engineering geological strata and lithology,human engineering activities and other different factors influence rainfall landslides.According to the survey,400~800 m range is the main sensitive landslide area considering altitude,landslide mainly occurs in the range of 10~35°and on slope facing southward,concave slope is more likely to trigger landslide than the convex slope.Beyond the above outcomes,human engineering activities also give rise to the occurrence of landslides.