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首页> 外文期刊>Journal of the American Water Resources Association >MODELING THE POTENTIAL IMPACT OF SEASONAL AND INACTIVE MULTI-AQUIFER WELLS ON CONTAMINANT MOVEMENT TO PUBLIC WATER-SUPPLY WELLS
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MODELING THE POTENTIAL IMPACT OF SEASONAL AND INACTIVE MULTI-AQUIFER WELLS ON CONTAMINANT MOVEMENT TO PUBLIC WATER-SUPPLY WELLS

机译：模拟季节性和非主动式多含水井对公共供水井污染物迁移的潜在影响

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摘要

Wells screened across multiple aquifers can provide pathways for the movement of surprisingly large volumes of groundwater to confined aquifers used for public water supply (PWS). Using a simple numerical model, we examine the impact of several pumping scenarios on leakage from an unconfined aquifer to a confined aquifer and conclude that a single inactive multi-aquifer well can contribute nearly 10% of total PWS well flow over a wide range of pumping rates. This leakage can occur even when the multi-aquifer well is more than a kilometer from the PWS well. The contribution from multi-aquifer wells may be greater under conditions where seasonal pumping (e.g., irrigation) creates large, widespread downward hydraulic gradients between aquifers. Under those conditions, water can continue to leak down a multi-aquifer well from an unconfined aquifer to a confined aquifer even when those multi-aquifer wells are actively pumped. An important implication is that, if an unconfined aquifer is contaminated, multi-aquifer wells can increase the vulnerability of a confined-aquifer PWS well.
机译：跨多个含水层筛选的井可为将大量地下水转移到用于公共供水（PWS）的受限含水层提供途径。使用简单的数值模型，我们研究了几种抽水方案对从无限制含水层到密闭含水层的泄漏的影响，并得出结论：在整个抽水范围内，单个非活动多含水层井可贡献近PWS井总流量的近10％费率。即使多含水层井距PWS井超过一公里，也会发生这种泄漏。在季节性抽水（例如灌溉）在含水层之间产生大而广泛的向下水力梯度的情况下，多含水层井的贡献可能更大。在这些条件下，即使主动抽水，多排水井也可能继续从无限制含水层泄漏到密闭含水层。一个重要的含义是，如果一个无限制的含水层被污染，多含水层的井会增加一个受限含水的PWS井的脆弱性。

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