荆江—洞庭湖水沙数学模型研究

Mathematical model for flow-sediment transportation of Jingjiang River-Dongting Lake network

在对复杂的荆江—洞庭湖水系进行概化的基础上,根据其中各节点和湖泊的实际情况,建立了对整个荆江—洞庭湖水系进行模拟计算的复杂河网水沙数学模型。采用1996年的相关资料进行了验证,结果表明,模型计算值与实测值吻合较好,说明本文对荆江—洞庭湖复杂边界条件的概化,特别是对湖泊调蓄作用的处理是比较符合实际情况的,模型可以模拟边界条件复杂的河网。运用该模型,可以计算出整个荆江—洞庭湖区域的洪水演进、泥沙淤积和河床变形情况,可供防洪调度以及江湖治理部门参考。

On the basis of generalized network a mathematical model for simulating the flowsediment transportation of Jingjiang RiverDongting Lake network is established.In the model,the regulation effect of lake on river network is taken into account and equations of discharge,sediment and energy conservation are established for every inflowoutflow node.The validity of the model is verified by the observation data in 1996Good agreement between calcuation and observation data is attained.The model is applied to predict the flood propagation,sedimentation transport and river erosion of the whole riverlake network system.