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首页> 外文期刊>Ground water >Stream Depletion in Alluvial Valleys Using the SDF Semianalytical Model
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Stream Depletion in Alluvial Valleys Using the SDF Semianalytical Model

机译：利用SDF半解析模型在冲积谷中的流耗。

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A semianalytical method commonly used for quantifying stream depletion caused by ground water pumping was reviewed for applicability in narrow alluvial aquifers. This stream depletion factor (SDF) method is based on the analytic Glover model, but uses a numerical model-derived input parameter, called the SDF, to partly account for mathematically nonideal conditions such as variable transmissivity and nearby aquifer boundaries. Using the SDF can improve and simplify depletion estimates. However, the method's approximations introduce error that increases with proximity to the impermeable aquifer boundary. This article reviews the history of the method and its assumptions. New stream depletion response curves are presented as functions of well position within bounded aquifers. A simple modification to modeled SDF values is proposed that allows the impermeable boundary to be accounted for with image wells, but without overaccounting for boundary effects that are already reflected in modeled SDFs. It is shown that SDFs for locations closer to the river than to the aquifer boundary do not reflect impermeable-boundary effects, and thus need no modification, and boundary effects in the other portion of the aquifer follow a predictable removable pattern. This method is verified by comparing response curves using modified SDFs with response curves from an extensively calibrated numerical model of a managed ground water recharge site. The modification improves SDF-based stream depletion estimates in bounded aquifers while still benefiting from the additional information contained in SDF maps and retaining their value as standardized references for water rights administration.
机译：综述了一种常用的半定量分析方法，该方法可用于定量分析地下水抽取引起的水流枯竭的适用性。该流耗竭因子（SDF）方法基于解析的Glover模型，但使用源自数值模型的输入参数（称为SDF）来部分考虑数学上的非理想条件，例如可变的透射率和附近的含水层边界。使用SDF可以改善和简化损耗估计。但是，该方法的近似值会引入误差，该误差会随着与不可渗透含水层边界的接近而增加。本文回顾了该方法的历史及其假设。提出了新的水流枯竭响应曲线，作为有界含水层内井位的函数。提出了对模型化SDF值的简单修改，它允许用图像井解决不可渗透的边界，但又不过度考虑已经在模型化SDF中反映的边界效应。结果表明，距离河流比含水层边界更近的位置的SDF不能反映不可渗透的边界效应，因此不需要修改，含水层其他部分的边界效应遵循可预测的可移动模式。通过将修改后的SDF的响应曲线与管理的地下水补给站点的广泛校准数值模型的响应曲线进行比较，验证了该方法的有效性。该修改改进了有界含水层中基于SDF的流耗估计，同时仍受益于SDF映射中包含的附加信息，并保留了其作为水权管理标准参考的价值。

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