含水层,特别是作为大型供排水对象的含水层,主要是由第四系松散上层和易溶岩层所构成.第四系上层由于其沉积环境的变化,往往呈层状结构.易溶岩层由于地下水的溶蚀作用,其透水性也常常随深度而变化,我们也可以将它视为“层状含水层”加以近似处理.适当地划分层次,是可以刻划出渗透性在垂直方向上渐变的性质.由此看来,层状非均质含水层中的地下水流动,是生产实践中经常遇到的一个课题.地下水不稳定井流的普遍意义,目前已逐渐地为人们所认识.以往那种在含水层中随意地取个“影响半径”,令“影响半径”处的水头保持不变,然后建立起稳定的井流方程,这 Aquifers, especially aquifers that serve as objects of large-scale drainage and drainage, are mainly composed of quaternary loose upper layers and easily accessible strata, which tend to have a layered structure due to changes in their depositional environment. The erosion of groundwater, its permeability is often also varies with depth, we can also treat it as a “stratiform aquifer” to be treated approximately.Classification of the appropriate level, is to characterize the permeability gradient in the vertical direction In view of this, the flow of groundwater in layered heterogeneous aquifers is one of the most frequently encountered problems in production practice.It is gradually recognized that the general significance of unstable groundwater flow is known Take a random “radius of influence” in the aquifer to keep the head at “radius of influence” constant, and then establish a stable well flow equation, which