Assessing the Effects of Typhoon on Compound Flooding in Coastal River Areas
It is not clear to what extent typhoons with different characteristics contribute to nearshore compound flooding as-sociated with heavy rainfall and storm surges.To clarify the relationship between nearshore typhoon events and compound flood disasters,a study is conducted on the southeast coast of China from 1980 to 2019.Based on precipitation and storm surge data,the dependence of drivers of compound flooding is analyzed.The copula statistical model is used to describe the return period of compound flooding,construct scenarios,and quantitatively evaluate the results,indicating that typhoons play an important role in increasing the potential for compound flooding.The results show that:(1)The compound flood po-tential in the southern coastal areas of China was higher than that in the northern,and the dependence between precipita-tion and storm surge is the key to the occurrence of compound flood;(2)On one hand typhoons increased the dependence of extreme precipitation and storm surges,increasing the potential for compound flooding by 10％-30％in Guangxi,Guang-dong Yang Jiang,and Zhejiang coastal areas;On the other hand,typhoons increased the probability of compound flooding by 50％-180％in Fujian-Suzhou,Hainan,and Macau;(3)Relatively,typhoon-induced storm surge can amplify compound flood potential more than typhoon-induced precipitation;(4)According to the typhoon loss records,it is found that the losses and casualties during typhoons with compound events are the vast majority compared to single flood events.The re-search results can provide scientific basis for the risk decision-making and disaster prevention planning of the compound flood caused by typhoon.
coastal river areascompound floodingtyphoonreturn periods
万方数据
维普
