基于数值模拟的含水层参数识别

利用地下水流数值模拟软件Modflow耦合大型抽水试验和长观孔水位两个模型的方法,对含水层参数进行了识别与校验,该方法求得的含水层参数避免了只利用抽水试验模型校验所带来的不确定性。同时利用抽水实验数据进行抽水与恢复的全过程曲线拟合,水位降深模拟相对误差小于6%,并且对均衡水量、泉水的溢出量以及末流场拟合程度进行了分析,均衡水量模拟相对误差最大为2.6%,泉水溢出量模拟相对误差最大为8.14%,末流场拟合程度也较好,从而提高了含水层参数的准确性。实例研究表明,这种求参方法精度高、切实可行,可以推广到其他的含水层参数确定中。

Aquifer Parameter Recognition Based on Numerical Simulation

A modeling method,which takes advantage of Groundwater Simulation Software(Modflow)coupled with large scale pumping test and long-term observation well, is proposed to identify and validate aquifer's parameter. This method avoids the uncertainty of obtained aquifer's parameter which existed in model validation of only conducting pumping test. In addition, when the global curve of pumping and recovering is fit by pumping test data, the relative error would be less than 6% in drawdown simulation, water balance accounting, overflow of spring as well as the simulation of flow field fit which improved accuracy of acquiring aquifer's parameter. The maximum relative error of water balance is 2.6%, the maximum relative of spring is 8.14%.The fact testifies that the method is high accurate and practical. The important is that it would provide experience to other research of the aquifer parameter calculation.