Festger Adam D, Walter Gary R
Trojan Technologies Inc., Tucson, AZ 85704, USA.
Ground Water. 2002 Nov-Dec;40(6):619-28. doi: 10.1111/j.1745-6584.2002.tb02548.x.
The capture zone or contributing area of a ground water extraction well can be defined as that portion of the aquifer from which the well draws its water. Accurate delineation of capture zones is important in many ground water remediation applications and in the definition of wellhead protection areas. Their mathematical delineation is often simplified by using quasi-steady-state models based on time-weighted average pumping rates and background hydraulic gradients. We present a new semianalytic approach for the definition of capture zones under transient-flow conditions. We then use this approach to evaluate the effects of time variations in the direction of the background hydraulic gradient on capture. Results are presented in the form of capture efficiency maps (CEMs). Although the area contributing to a given well is found to generally expand relative to the steady-state average capture zone when the gradient direction varies, the zone of 100% capture may expand or contract depending on site-specific conditions. We illustrate our CEM approach by applying it to the design of a plume containment system.
地下水抽取井的捕获区或补给区可定义为含水层中该井取水的部分区域。在许多地下水修复应用以及井口保护区的定义中，准确划定捕获区至关重要。通过使用基于时间加权平均抽水率和背景水力梯度的准稳态模型，其数学划定通常会得到简化。我们提出了一种用于定义瞬态流条件下捕获区的新半解析方法。然后，我们使用该方法评估背景水力梯度方向的时间变化对捕获的影响。结果以捕获效率图（CEM）的形式呈现。尽管当梯度方向变化时，发现给定井的补给区相对于稳态平均捕获区通常会扩大，但100%捕获区可能会根据具体场地条件扩大或缩小。我们通过将CEM方法应用于羽流遏制系统的设计来说明这一方法。
