株洲市地质灾害特征与降雨量的关系

The relationship between geological hazard characteristics and rainfall in Zhuzhou

利用2011—2021年株洲市地质灾害灾情调查资料,统计分析株洲市地质灾害特征,以2019年7月6—14日发生在湖南省株洲市的一次极端强降雨过程为例,分析株洲市地质灾害特征与降雨量的关系。结果表明:(1)株洲市地质灾害具有点多面广,规模小,突发性强等特征,地质灾害类型以滑坡为主,其次为崩塌。(2)日降雨量在 [50,150)mm,最大小时雨强在[20,30)mm·h^(-1),72 h降雨量在[200,300)mm,有效降雨量在400mm以上时,对地质灾害数量贡献率最大。(3)有效雨量作为地质灾害预警主要因子确定的地质灾害分级预警雨量阈值,经检验科学合理,可在应用中推广。

Based on the survey data of geological disasters in Zhuzhou City from 2011 to 2021,the characteristics of geological disasters in Zhuzhou City are analyzed statistically,and the relationship between the characteristics of geological disasters and rainfall in Zhuzhou City is analyzed by taking an example of an extreme rainfall process that occurred in Zhuzhou City,Hunan Province,from 6—14 July 2019 as an example.The results show that:(1)the geological disasters in Zhuzhou City are characterized by a wide range of points,small scale and strong sudden occurrence.The types of geological disasters are dominated bylandslides,followed by collapses;(2)when the daily rainfall is[50,150)mm,the maximum rainfall intensity is[20,30)mm·h^(-1),the rainfall in 72 h is[200,300)mm,and the effective rainfall is above 400 mm,the contribution rate to the number of geological disasters is the largest;(3)effective rainfall as the main factor of geological disaster warning is determined as the rainfall threshold for geological hazard classification and warning,which has been tested scientifically and reasonably.It is worth popularizing in practical application.