黄河下游灌渠水流泥沙数学模型

本文结合灌渠的结构特点及水流泥沙特性，对一维非耦合，非均匀、不平衡沙基本方程组进行了合理的简化，根据实体模型试验实测资料，确定了自流与提灌时干，支渠分流的不同分沙分水比。

A mathematical model of flow and sediment transport in irrigation canals of the Lower Yellow River

According to the layout of irrigation canal and characteristics of flow and sediment transport,in this paper,the one D governing equations of flow and sediment movement have been simplified rationally,taking account of non coupled,non uniform and non equilibrium sediment transport, and based on the model test and observed data,the rate between sediment diversion ratio and water diversion ratio from main to branch canal under different methods of diversion (gravity irrigation and lift irrigation) have been determined. Surmounting the difficulties of lacking data of diverted discharge in branch canal,and considering non equilibrium sediment transport and different grain size distributions in flood and non flood seasons,a mathematical model of flow and sediment transport in irrigation canals is developed. The model is verified by the measured data in Bojili irrigation district,and shows that the model can be used to simulate various kinds of flow and sediment movement in irrigation canals. Thus,it provides the basis to establish a mathematical model of flow and sediment movement in irrigation canal network.