Numerical study of the evolution trend in the river-lake relationship in the middle and lower reaches of the Yangtze River
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摘要: 以长江中下游防洪系统为对象,概述了在大型复杂防洪系统洪水行为数值模拟基础上,成功地将长江中下游洪水演进数学模型转化为面向长江防洪系统防洪规划方案评估需求的长江中下游江湖水沙演变的数学模型.为适应防洪规划方案论证涉及江湖水沙相互制衡相互关联客观情况,建立了面向江湖水沙关系及其演变的数学模型.针对长江中下游江湖水沙运动特点,在水沙数值模拟的范围内侧重对下荆江河道冲刷、荆江三口分流分沙模式、洞庭湖泥沙淤积、江湖耦合等环节进行了讨论,提出了合理可行的数值处理方法.模拟结果较好反映了江湖水沙演变规律,主要成果已应用于长江中下游防洪规划和防汛调度方案中.Abstract: Using the flood control system in the middle and lower reaches of the Yangtze River as study objects,a numerical model for the smiulation of flow sedmient transportrates in the rivers and lakes of the reaches is presented.The model is a further development of the numerical flood module that is part of a com plex flood control system and able to provide information for flood control planning.The model is used to studying the control of flow sed mient trans portrates in the rivers and lakes of the reaches under different planning requirements.The numerical study on the in teraction between rivers and lakes is carried.As a result,the evolution trend in the riverlake relationship can thus be established.A miing at the regmie of flow sedmient transport in the rivers and lakes of the reaches,the focus is on the numerical smiulation of river scouring in the Jing Jiang river reach,flow sedmient transport rates in Jing Jiang three estuary,and sedmien tation in the Dongting Lake,as well as the coupling of rivers and lakes.On that basis,the numerical model is miproved to ensure that the numerical treatment of the model is more feasible.The result shows that the modified model is able to effectively smiulate the evolution of flowsed mient transport rates in the rivers and lakes of the reaches.Our results have been used in the planning of flood control projects and flood management practices in the middle reaches of the Yangtze River.
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