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MODFLOW是目前世界范围内被广泛使用的地下水渗流模型。为分析MODFLOW中不同方程组求解方法及求解参数组合对计算结果精度的影响 ,对同一典型水文地质模型进行了一系列模拟试验。结果表明 :对于给定条件 ,选用PCG2法或SIP法 (如果求解参数组合选取恰当 )求解可得到满足精度的结果 ;而选用SSOR法任何使用的求解参数组合均无法获得满足精度要求的结果。模拟结果同时证实 ,除非水均衡误差也相当小 ,否则水头变化收敛指标较小时收敛的计算也不能保证计算结果有可靠的精度。
MODFLOW is the widely used groundwater seepage model in the world. In order to analyze the influence of the solving methods of different equations in MODFLOW and the accuracy of calculation results on the calculation results, a series of simulations were carried out on the same typical hydrogeological model. The results show that, for given conditions, the results of satisfying the accuracy can be obtained by using the PCG2 method or the SIP method (if the solution of the parameter combination is properly selected), and the result of satisfying the accuracy requirement can not be obtained by using any combination of the solution parameters of the SSOR method. Simulation results also confirmed that unless the water balance error is quite small, otherwise convergence of the head convergence index is small, the convergence of the calculation can not guarantee the results of a reliable accuracy.