平原灌区明渠涨水过程数值计算

通过联立明渠非恒定流的运动方程和连续性方程,经离散变换后采差分法求解得到了计算明渠涨水过程的计算模型,本模型的边界和初始条件实际上就是进口断面处的水位和流量变化的过程函数。并计算了一实例,得到了经试验验证较为合理的计算结果,证实了该模型的合理性与可行性,故该计算结果可用来指导明渠系统调节调度或是预报洪峰行进,为灌区渠系的防洪提供了理论参考。由于该模型的建立的控制方程适用于小坡度明渠,故该模型适用于坡度较小的渠道,尤其适用于平原灌区渠系。

Numerical Calculation of Water Rising of Open Channel in Plain Irrigation Areas

Through the simultaneous of motion and continuity equation of unsteady flow in open channel,after the course of discrete transform,calculation model water rising of open channel was obtained by difference method,actually,the boundary and initial condition of the model are process function of water level and discharge change of entrance section.An example was calculated to get quite reasonable results,it vertified the rationality and feasibility of this model,so the model could be used to guide the dispatching of system regulation in open channel or forecast of flood peak,it provided certain theory reference for flood control of channel system in irrigation areas.Due to control equation of the model was suitable for open channel in small slope,so the model was suitable for open channel in small slope,especially channel system in plain irrigation areas.