《地下水》刊登“用MODFLOW预测集水井出水量”

作者：Vic Kelson

Journal:Ground Water,Volume:20；Issues: 1, 1-9

关键词：集水井；MODFLOW；三维水流；裘布依-福希海默假定

中文摘要：地下水流模型广泛应用于井和水源地的设计当中。由于研究问题空间尺度较大，因此一般不必考虑局部尺度的细节问题。所以，建模者通常应用基于裘布依-福希海默假定的二维模型或准三维模型。裘布依模型提供了一系列的工具，可以解决包括地下水与地表水的相互作用、对井流干扰的可能性以及不同含水层特性和不同补给速率等在内的区域性地下水流问题。然而，考虑到运行水位或井中降深是假定的，裘布依模型高估了井的出水量。这一差异对于设计目标是不可接受的，因此需要建立新的模型来精确预测井的出水量。现存的垂直井模拟方法对于水平井管或集水井出水量的预测效果甚微。在平面图中，水平输水管具有线性几何特征，可能一直延伸到与数值模拟模型的行或列包含不到的邻近单元中。此外，所建模型必须能够说明汇入水平井管的三维水流效应和井群之间的干扰作用，这些都依赖于对特定井的设计。本文运用美国地调局的MODFLOW编码，建立了一种应用到地下水流数值模型中模拟倾斜或水平井出水量的新方法，并将该方法在三维均匀流中的模拟结果与精确的解析解进行了比较。

Predicting Collector Well Yields with MODFLOW

Authors:Vic Kelson

Journal:Ground Water16 FEB 2012, 1-9

Abstract：Groundwater flow models are commonly used to design new wells and wellfields. As the spatial scale ofthe problem is large and much local-scale detail is not needed, modelers often utilize two-dimensional (2D) orquasi three-dimensional models based on the Dupuit-Forchheimer assumption. Dupuit models offer a robust setof tools for simulating regional groundwater flow including interactions with surface waters, the potential for wellinterference, and varying aquifer properties and recharge rates. However, given an assumed operating water levelor drawdown at a well screen, Dupuit models systematically overpredict well yields. For design purposes, thisdiscrepancy is unacceptable, and a method for predicting accurate well yields is needed. While published methodsexist for vertical wells, little guidance is available for predicting yields in horizontal screens or collector wells. Inplan view, a horizontal screen has a linear geometry, and will likely extend over several neighboring cells that maynot align with rows or columns in a numerical model. Furthermore, the model must account for the effects of convergingthree-dimensional (3D) flow to the well screens and hydraulic interference among the well screens; theseall depend on the design of a specific well. This paper presents a new method for simulating the yield of angledor horizontal well screens in numerical groundwater flow models, specifically using the USGS code MODFLOW.The new method is compared to a detailed, 3D analytic element model of a collector well in a field of uniform flow.

原文链接：http://onlinelibrary.wiley.com/doi/10.1111/j.1745-6584.2012.00910.x/full