浙江山洪灾害监测预警体系建设实践与思考OA

Flash flood disasters are characterized by strong suddenness,great destructiveness and complex disaster chains,severely threatening the safety of people's life and property as well as social stability.Featuring an extensive coverage of mountains and hills and concentrated rainfall in flood seasons,Zhejiang Province is an area with high incidence of flash floods.In recent years,frequent extreme weather events,coupled with disturbances from human social and economic activities,have caused a diversified and diffused trend of disaster-causing factors,making the prevention and control of flash flood disasters increasingly difficult.To this end,Zhejiang Province has effectively improved its capacity of preventing flash floods by constructing a three-dimensional monitoring network of"three lines of defense"and a multi-stage progressive early warning system to enhance the accuracy and timeliness of early warnings,and strengthen the construction of grassroots early warning and risk avoidance capabilities.This paper analyzes the deficiencies and challenges in the lead time of early warning,defense units,monitoring stability,responsibility connection and grassroots capabilities of flash floods in Zhejiang Province under new situations.Additionally,it proposes corresponding countermeasures from the following five aspects.The layout of monitoring station networks should be optimized to improve the capability of capturing extreme rainfall,dynamic risk identification should be strengthened to expand the coverage of early warnings,and early warning models and algorithms should be iterated to enhance the forecasting and early warning accuracy.Meanwhile,it is necessary to improve the mass monitoring and prevention system to achieve the full coverage of early warnings at the grassroots level,and strengthen research on scientific and technological support to promote the iteration of early warning technologies.By sorting out and reflecting on the construction of flash flood monitoring and early warning systems in Zhejiang Province,this paper can provide a useful reference for improving flash flood prevention systems in other regions of China.