中文摘要：

赣江下游受江湖关系顶托影响,水流运动极为复杂,水位流量关系年际变化显著。通过建立正交曲线坐标系平面二维浅水方程ELADI（Eulerian-Lagrangian alternating direction implicit method）有限差分方法的水动力模型对赣江河流下游进行了水位,流速与东西河分流比验证和连续十年的分流比模拟,分析了水位流量关系和分流比的变化特征。模拟与分析结果表明,模型高效稳定,计算结果与实测资料吻合良好,可用于河流水动力的数值模拟与预测。

英文摘要：

The lower Ganjiang river,under the impact of backwater caused by its discharging lakes,has complicated hydrodynamic features with remarkable inter-annual variation in its flow-stage relationship.This paper presents a two-dimensional hydrodynamic model of shallow water,using a finite difference method of Eulerian-Lagrangian alternating direction implicit（ELADI） and an orthogonal curvilinear coordinate system.With this model,the variations of hydrodynamic parameters of the Dong-Xi river,a tributary of the lower Ganjiang,over ten successive years were simulated and verified,such as water level,velocity distribution and diversion ratios.Variations of the flow-stage relationship and diversion ratios were analyzed.These results are in good agreement with the field measurements.The model is an efficient and useful tool for hydrodynamic simulation and prediction.