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受人类活动的影响,水沙灾害事件相继发生,对人们的生产、生活造成了威胁。以洞庭湖流域代表性水文站的年径流量和年输沙量系列数据为基础,应用P-III型曲线分别拟合并求得“松滋口、太平口、藕池口”三口入湖、“湘江、资江、沅水、澧水”四水入湖和城陵矶站出湖年径流量、年输沙量的边缘分布函数,再采用水文事件遭遇分析中广泛应用的Copula函数,建立洞庭湖流域水沙联合分布模型,分析洞庭湖流域水沙丰枯遭遇频率。研究结果表明洞庭湖三口、四水和城陵矶站的水沙丰枯遭遇频率关系与洞庭湖流域的水沙运动有密切联系,运用该水沙耦合模型可以为洞庭湖流域防洪减灾提供重要的理论依据。
Affected by human activities, water and sand disasters have taken place one after another, posing a threat to people’s production and life. Based on the annual runoff and annual sediment transport data of representative hydrological stations in Dongting Lake Basin, P-III type curves were used to fit and calculate the “Songzikou, Taipingkou and Ouchikou” into the lake , “Xiangjiang, Zijiang, Yuanshui, Lishui ” the four water into the lake and Chenglingji station out of the lake annual runoff, annual sediment transport marginal distribution function, and then use the hydrological event encountered in the analysis of the widely used Copula Function to establish a joint model of water and sediment distribution in the Dongting Lake basin and analyze the frequency of water, The results show that the frequency relationship between water and sediment abundance in Dongting Lake, Sihsiung River and Chenglingji Station is closely related to water and sediment movement in Dongting Lake Basin. Using this model can provide important information for flood control and disaster mitigation in Dongting Lake Basin Theoretical basis.