基于MODFLOW的面状通量处理方法研究

An approach for simulating planar flux based on MODFLOW

针对国际通用软件MODFLOW缺乏面状通量处理的缺陷,基于RCH子程序(RechargePackage),开发出可实现多层面状补给和排泄的子程序包PRD(Planar Recharge and DischargePackage)。应用PRD可以在模型的所有层位上进行面状补给或排泄处理,也可实现在同一层位的多次不同面状通量过程。该方法有效解决了降雨补给、农业开采和灌溉回归等不同源汇项的多层、多次叠加表达,避免了传统点井处理导致的开采量调配问题,为区域、流域尺度地下水数值模型提供了新的源汇项处理方法。该方法成功应用于北京平谷盆地的数值模型中,并取得了理想效果。

Considering the disadvantage to lack of simulating planar flux in software MODFLOW used widely,the program package PRD（Planar Recharge and Discharge Package） is developed based on the subroutine RCH（Recharge Package）.With this PRD package,the area recharge or discharge could occur in all layers of the model,and it could be assigned with different values repeatedly in the same position.The said method could effectively solve the numerical expression of the recharge,agricultural exploitation and irrigation return in a groundwater flow model,and it also greatly improves the application of MODFLOW program.The PRD subroutine package is successfully applied to the numerical model for Beijing Pinggu basin,which achieves the satisfactory results.