河渠水位曲线回水影响半无限含水层河渠附近地下水非稳定流计算

本文探讨河渠水位呈曲线变化时,河渠附近地下水非稳定运动问题。抛开经典河渠附近地下水非稳定渗流理论之瞬时回水的假设条件,重新推导河渠影响半无限潜水含水层地下水非稳定流计算公式。应用数值逼近的理论、逼近河渠水位变化规律。给出河渠水位以任意次多项式规律变化的一系列地下水非稳定流计算公式。从理论上证明了瞬时回水假设的根本矛盾,并用一实际例子对比计算加以验证。指出了抛弃瞬时回水的假设条件,重新建立一套全新的河渠附近地下水非稳定流理论的必要性。

UNSTEADY GROUNDWATER FLOW CALCULATION IN A SEMI-INFINITE AQUIFER NEAR A RIVER OR CHANNEL AFFECTED BY BACKWATER LEVEL IN THE RIVER OR CHANNEL

This paper deals with unsteady groundwater flow near river or channel with change in water level. The author forsakes the assumption condition for instantaneous backwater in classical unsteady flow theory about groundwater near river or channel, and devolopes calculation formulas for unsteady groundwater flow in semi-infinite phreatic aquifer affected by river or channel. The fluctuating pattern of river or channel water level is approached by using the theory of numerical approach. The author gives unsteady groundwater flow calculation formulas with arbitrary order polynomial law of river or channel waterlevel. The author has proved and exemplified the fundametal contradiction in instantaneous backwater assumption. The author pointed out the necessity of forsaking the assumption condition of instaneous backwater and establishing a series of new formulas for unsteady groundwater flow in the region near rivers or channel.