河网非恒定水沙数学模型研究

建立了能够适用于多种情况的河网非恒定流水沙数学模型。推导提出了河网泥沙方程组的分级解法,提出了适用于河网计算的汊点分沙模式,分析和对比了多种分沙模式的适用性,对河网区域中可蓄水汊点也提出了相应的处理办法。采用汉江杜家台分蓄洪区的资料作了模型的验证和应用。

Numerical simulation of sediment transport in unsteady flow of river network

A numerical model to simulate sediment transportation and river-bed variation in river networks is presented. Flow simulation is based on commonly used the gradation method, in which the matrix formed junction equations are divided by sub-area groups. For simulation of sediment transportation process, several methods are compared to describe sediment diversion at the junction nodes, together with analysis of their advantage and suitable situation in application. By means of the sediment diversion methods, sediment transport equations can also be solved by the gradation method with the divided junctions groups.The technique to handle junction nodes in which water and sediment deposition can be stored is also discussed for applying to flood retarding basin. Finally, with the data of Dujiatai retarding basin in Hanjiang River, the validity of the model is checked, and the result shows that the model can be applied in wide practice and is worth recommending.