序言含水层的透水性,在有些情况,具有方向性。这是由于形成含水层的裂隙发育程度在各个(水平)方向不同所引起的。因而表征含水层透水性的渗透系数也将随着水流方向的不同而改变。我们假定含水层的透水性是连续变化的,即由最大逐渐变到最小或者相反,这就是说,假如以向量表 The water permeability of aquifers, in some cases, is directional. This is due to the fact that the degree of development of fractures that form aquifers varies in all (horizontal) directions. Thus the permeability coefficient characterizing the permeability of the aquifer will also change with the direction of the water flow. We assume that the permeability of the aquifer is continuously changing from maximum to minimum or vice versa, that is to say,