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利用有限单元法和计算机来模拟地下水问题,虽已广泛应用,但当前最大的困难是不易获得准确而可靠的水文地质参数。在反求渗透系数方面,一般有间接和直接两种解法,前者采用迭代法进行试算,首先估计参数初值,然后解正问题,如算得的和实测的水头不一致,则调整参数,重新计算,直到非常接近为止;后者则设水头为已知,把参数作为应变量,直接求解,但要求时间步长的数目至少等于未知参数的数目。这两种方法对实测的水头值都很
Although the finite element method and computer to simulate groundwater problems have been widely used, the biggest difficulty at present is that it is not easy to obtain accurate and reliable hydrogeological parameters. In terms of inverse permeability coefficient, there are generally two kinds of indirect and direct solutions. The former uses iterative method to conduct trial calculations. First, it estimates initial values of parameters, and then solves positive problems. If the calculated and measured heads do not match, adjust parameters and recalculate. Until very close, the latter sets the head as known, and uses the parameter as a dependent variable to solve it directly, but the number of required time steps is at least equal to the number of unknown parameters. Both methods are very good for the measured head value