永兴县小流域山洪灾害分析评价

Analysis and Evaluation of Flash Floods in Small Watersheds in Yongxing County

由于地形地貌条件复杂、气候系统不稳定,永兴县山洪灾害频发,人民群众生命财产安全受到了极大威胁。通过调查永兴县防治区水文气象、暴雨特性、小流域特征、历史山洪灾害、山洪沟断面基本情况及山洪灾害防治现状等基础信息,建立了永兴县山洪灾害调查成果数据库。综合评价了永兴县防治区防汛现状,科学具体划分了山洪灾害危险区、明确转移路线和临时避险点;分析了降雨、洪水与成灾之间的关系,建立了人口–水位–流量关系曲线,科学设定各防灾对象预警指标和预警范围,为永兴县山洪灾害分析评价和防治提供基础数据。

Due to the complex topographic and geomorphological conditions and unstable climate system, flash floods occur frequently in Yongxing County, and the safety of people’s lives and properties is greatly threatened. By investigating the basic information of hydro-meteorology, storm characteristics, sub-basin characteristics, historical flash flood disasters, basic situation of flash flood ditch sections and current situation of flash flood disaster prevention in the control area of Yongxing County, a database of flash flood disaster survey results is established. The current situation of flood prevention and control area of Yongxing County is evaluated comprehensively, the flash flood hazard area is divided scientifically and specifically, the transfer route and temporary shelter are also clarified. This study analyzes the relationship between rainfall, flood and disaster formation, establishes the population-water level-flow relationship curve, the warning index and warning range for each disaster prevention object are set scientifically, which provides basic data for flash flood disaster analysis, evaluation and prevention in Yongxing County.