Renmin Zhujiang (Jan 2022)
Analysis of No.1 Flood Disaster in Poyang Lake Basin in 2020 Based on Natural Disaster System Theory
Abstract
China is one of the countries most hit by flood disasters in the world.Flood disasters have the highest frequency,are distributed in the widest scope,and cause the largest loss in China.It is of great guiding significance to analyze the characteristics of disaster system elements for a better understanding of the evolution process of flood disasters.This study collects the disaster-formative environment (topography and river network),disaster-bearing body (socioeconomy),disaster-inducing factor (daily rainfall),and disaster losses in the core area of the Poyang Lake Basin.Moreover,it investigates the disaster mechanism and evolution process of the No.1 flood disaster in the Poyang Lake Basin in 2020 and discusses the flood prevention and control measures for the Poyang Lake Basin.The results show that the high-intensity rainfall since June was the precondition of the No.1 flood disaster in 2020 in the Poyang Lake Basin,which led to almost saturated soil moisture.Under the joint action of extremely heavy rainfall from 1 to 8 July (strong disaster-inducing factor) and low elevation (high sensitivity of disaster-formative environment) in the core area of the Poyang Lake Basin,the floods spread quickly and flooded the socioeconomic system (disaster-bearing body) of the lake area in a short time.Case analyses of typical flood disasters from the perspective of disaster systems will help improve the capabilities for risk identification,disaster prevention,and disaster mitigation of regional flood disasters.
