Analysis of Flood Risk of Urban Agglomeration Polders Using Multivariate Copula

Yuqin Gao, Dongdong Wang, Zhenxing Zhang, Zhenzhen Ma, Zichen Guo, Liu Ye

Research output: Contribution to journalArticle

Abstract

Urban agglomeration polders (UAPs) are often used to control flooding in eastern China. The impacts of UAPs on individual flood events have been extensively examined, but how flood risks are influenced by UAPs is much less examined. This study aimed to explore a three-dimensional joint distribution of annual flood volume, peak flow and water level to examine UAPs’ impact on flood risks based on hydrological simulations. The dependence between pairwise hydrological characteristics are measured by rank correlation coefficients and graphs. An Archimedean Copula is applied to model the dependence structure. This approach is applied to the Qinhuai River Basin where UAPs are used proactively for flood control. The result shows that the Frank Copula can better represent the dependence structure in the Qinhuai River Basin. UAPs increase risks of individual flood characteristics and integrated risks. UAPs have a relatively greater impact on water level than the other two flood characteristics. It is noted that the impact on flood risk levels off for greater floods.
Original languageEnglish (US)
JournalWater (Switzerland)
Volume10
Issue number10
DOIs
StatePublished - 2018
Externally publishedYes

Keywords

  • ISWS

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