甘肃省陇西县地质灾害气象条件分析

利用陇西县近20年的地质灾害与降水资料,分析发生地质灾害的主要区域和具体地点及危害程度和分布特征,研究了引发地质灾害的气象条件。研究结果表明:山体滑坡、地裂缝、塌陷和泥石流是陇西县主要的地质灾害类型,地质灾害时段主要集中在局部强降雨和暴雨出现的夏季(5～8月)。地质灾害发生有多方面因素构成,大—暴雨、暴雨降水过程是地质灾害发生的决定条件,其次是人为性破坏了地质原有结构,导致出现或诱发地质灾害。我们在探讨地质灾害形成的主要成因的基础上,确定了地质灾害发生的降水强度标准,再根据多年的预报经验,寻找出相关性较好的预报因子,应用气象资料分析判断引发地质灾害可能性大小,发布预警信号和地质气象灾害预警发布和防御流程。

ANALYSIS ON METEOROLOGIC CONDITION FOR GEOLOGIC HAZARDS IN LONGXI COUNTY OF GANSU PROVINCE

According to the data of geologic hazards and precipitation in Longxi County,the paper analyzed the destructive degree and distribution of geologic hazards,and summarized the meteorological conditions which induced the geologic hazards.The study shows that landslides in mountainous area,geofracture,collapse and debris flow are main types of geologic hazard in Longxi,and the most geologic hazards occurred in summer(from May to August) when the heavy precipitation and rainstorm took place in the local area.Th...