利用MODFLOW模拟井流的误差特征  

Characteristics of Error in Numerical Modeling of Well Flow with MODFLOW

作　　者：夏强[1] 王旭升[1] 鲁林波[1] 

机构地区：[1]中国地质大学水资源与环境学院,北京100083

出　　处：《工程勘察》2007年第10期29-32,37,共5页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(40542011)资助

摘　　要：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 widely used in numerical modeling of groundwater flow. In order to analyze the characteristics of error in well flow simulation with MODFLOW, 4 groups of numerical experiments with different scale of grid cell has been conducted. Comparing the numerical results with the analytical solutions from Theis＇s Equation, three types of errors are divided, i. e. solution error, interpolation error and depiction error. Solution error is directly brought by MODFLOW core program, whereas interpolation error is born when estimating the head distribution between adjacent cell centers. Biggest error occurs from the hydraulic head within the well by unreasonable depiction of near-well flow in numerical modeling.

关 键 词：MODFLOW 数值模拟 井流 误差 

分 类 号：P641.2[天文地球—地质矿产勘探]