一、引言有限单元法,为计算地下水抽取量在空间和时间上的拟定变化和用水管理上的拟定变化对地下水系统所产生的影响,提供了模拟技术。这种方法可以精确地表示出地下水系统的几何形象,能适应复杂的边界条件。这就克服了有限差分法之类的其他模拟技术所存在的一大缺陷。有限单元法的应用,已经推广到模拟理想水流条件以及美国科罗拉多州东南部拉马 I. INTRODUCTION The finite element method provides simulation techniques for calculating the effects of planned changes in groundwater withdrawal in space and time and proposed changes in water management on groundwater systems. This method can accurately represent the geometric image of groundwater system, can adapt to complex boundary conditions. This overcomes one of the major pitfalls of other simulation techniques such as finite difference methods. The application of the finite element method has been extended to simulate the ideal flow conditions as well as Rama, southeast of Colorado