基于Visual MODFLOW的承压含水层模型调参主控因素研究

Study of the main control factors for the tuning of a pressurized aquifer model based on Visual MODFLOW

Visual MODFLOW作为一款操作简单、可视化功能强大的三维地下水流模拟软件,在世界范围内应用广泛。在利用Visual MODFLOW进行地下水流数值模拟时,模型的拟合校验是必不可少的。由于在模型建立初期所赋参数众多,若在模型调参阶段全部进行调节,不仅耗费时间,工作量还将十分繁杂。因此,明确模型调参阶段的主要参数对于模型校正工作意义重大。本文通过对承压含水层中水流运动的研究,初步得出在承压含水层条件下模型拟合的影响参数。之后通过实例对承压含水层条件下所建模型初始赋值的全部参数进行分析验证,从而得知在承压含水层条件下模型拟合的主要控制因素。明确承压含水层条件下所建模型调参时的主控因素,可为利用Visual MODFLOW对承压含水层条件下的模型进行校正时提供参考经验以及减少不必要的工作量。

Visual MODFLOW,as a 3D groundwater flow simulation software with simple operation and powerful visualization function,is widely used worldwide.When using Visual MODFLOW for groundwater flow numerical simulation,model fit verification is essential.Due to the large number of parameters assigned in the initial stage of model establishment,if all adjustments are made in the model adjustment stage,it will not only consume time,but will also be very complicated.Therefore,clarifying the main parameters of the model tuning stage is of great significance to the model calibration work.In this paper,through the study of the water flow movement in the confined aquifer,the influencing parameters of the model fitting under the condition of the confined aquifer are initially obtained.Afterwards,through examples,all the parameters of the initial assignment of the model built under confined aquifer conditions are analyzed and verified,so as to know the main control factors of model fitting under confined aquifer conditions.Clarify the main control factors when adjusting the parameters of the model built under confined aquifer conditions,which can provide reference experience and reduce unnecessary workload when using Visual MODFLOW to calibrate the model under confined aquifer conditions.