闽北地质灾害的分布特征及其成因分析

通过分析闽北地质灾害与降水特征表明:闽北地质灾害时间分布与降水、尤其是与暴雨的分布一致。其空间分布与地质条件的分布一致,而与年降雨量、3~8月降雨量的分布相反。地质灾害发生数的74.9%均在针叶林及经济林中,95.7%发生在坡度>20°的陡坡处。地质灾害与岩土性质以及岩土结构有一定的关系。当浮土厚度在5m或以上时极易发生地质灾害。因此,闽北地质灾害的发生的主要因素是地质条件,强降雨则是其重要的触发条件,人类活动也是诱发地质灾害的因素之一。文章根据地质条件将闽北的地质灾害按易发程度分为:高易发区、中易发区及低易发区。

Distributional characteristics and genetic analysis for geologic hazard of North Fujian

The analysis of geologic hazard and the charateristics of precipitation in north of Fujian shows the time distribution of geologic hazard and precipitation(especially rainstorm),is very consistent in North Fujian.The spatial distribution and the geologic condition is consistent,but and annual rainfall and rainfall during March-August is contrary.(74.9%) of amount for geologic hazard happen in coniferous forest and non-timber product forest.95.7% at the place about physiographic form grade gradient greater than 20 degree.The relovance is unconspicuous about the geologic hazard and floor fundus styles of rock,but it and the property of rock,the configuration of rock is related.When the thickness of cover mass preponderate over 5 m,the geologic hazard is very advantaged to take place.Hence,the occur of geologic hazard was controlled by geologic condition oneself,rainstrom is the important triggering factor to take place the geologic hazard.Mankind activities are the complication factor to geologic hazard.Based on geologic condition,this article compartmentalize geologic hazard region of North Fujian into three styles: very easy happen region,medium easy happen region and low-grade easy happen region.