Uncertainty Quantification for Multivariate Eco-Hydrological Risk in the Xiangxi River wit

Uncertainty Quantification for Multivariate Eco-Hydrological Risk in the Xiangxi River within the

Three Gorges Reservoir Area in China

Yurui Fan;Guohe Huang;Yin Zhang;Yongping Li

【期刊名称】《工程（英文）》 【年(卷),期】2018(004)005

【摘要】This study develops a multivariate eco-hydrological risk-assessment framework based on the multivariate copula method in order to evaluate the occurrence of extreme eco-hydrological events for the Xiangxi River within the Three Gorges Reservoir (TGR) area in China.Parameter

uncertainties

in

marginal

distributions

and

dependence structure are quantified by a Markov chain Monte Carlo (MCMC) algotithm.Uncertainties in the joint return periods are evaluated based on the posterior distributions.The probabilistic features of bivariate and multivariate hydrological risk are also characterized.The results show that the obtained predictive intervals bracketed the observations well,especially for flood duration.The uncertainty for the joint return period in \case increases with an increase in the return period for univariate flood variables.Furthermore,a low design discharge and high service time may lead to high bivariate hydrological risk with great uncertainty. 【总页数】10页(617-626)