傍河地下水与河水脱节机理研究

用一个砂槽模型模拟地下水与河水脱节过程，观测脱节现象与渗流规律，再用饱和－非饱和流理论通过计算机对这些现象和规律进行理论模拟与验证。物理实验和理论模拟得到了相同的认识：地下水与河水脱节之前，河水浸润曲线是一条弯向河流的上凹曲线；脱节点不位于河床面而在河床以下的含水层内部；脱节后在河床下形成上下两个饱和层。

THE RESEARCH ON THE HVDRAULIC DISCONNECTION BETWEEN GROUNDWATER AND RIVER WATER

The groundwater well field nearby a river is a common way to extract ground water from aquifer in north China. However, the hydraulic disconnection of groudwater and river water often occurs in some well fields in arid seasons. The experiment with a sand-box model is used to investigate the development of hydraulic disconnection of groundwater with river water. Computer modelling of saturated-unsaturated flow is used to simulate the phenomenon of hydraulic disconnection. Some discovery results are obtained from the experiment and simulation. These are a the disconnection point is located in the water bearing layer beneath river-bed, and b. saturated zones exists under river-bed, one suspended zone in contact with river water and the other with table water.