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MODFLOW是目前被广泛使用的地下水流数值模型。为分析MODFLOW模拟井流的误差特征,对承压含水层单井抽水问题进行了不同网格尺度下的4组模拟试验。对比模拟水头值与Theis公式解析解,我们将误差分为3类:求解误差、插值误差和模型刻画误差。求解误差是运行MODFLOW核心程序直接产生的,而对格点之间水头分布进行评估时将产生插值误差.最大误差发生在井点位置,这是由数值模型中井周附近水流刻画不合理造成的。
MODFLOW is a widely used numerical model of groundwater flow. In order to analyze the error characteristics of MODFLOW simulation well flow, four groups of simulation experiments under different grid scales were carried out on single-well pumping of confined aquifers. Comparing the simulated head value with the Theis formula, we classify the errors into three categories: solution error, interpolation error and model characterization error. The solution error is directly generated by running MODFLOW core program, and the interpolation error will be generated when evaluating the head distribution between grid points.The maximum error occurs at the well point, which is caused by the irrational characterization of the water near the well periphery in the numerical model.