The Multi‐Scale Dynamics of Groundwater Depletion
The Multi‐Scale Dynamics of Groundwater Depletion
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地下水枯竭的多尺度动力学
DOI：
10.1029/2020wr029402
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发表时间：
2021
影响因子：
5.4
通讯作者：
D. B. McLaughlin
中科院分区：
文献类型：
--
作者：
R. Sahu;D. B. McLaughlin
蓄水层储存的不可持续的枯竭和下游用户地下水的转移仍然是严重的问题，尽管它们的不利影响已得到广泛认识。地下水枯竭涉及经济动机驱动的抽水决策和物理约束之间的相互作用。在这里，我们通过使用最优控制技术来描述共享含水层的经济主体的抽水决策来研究这些相互作用。我们的方法依赖于无约束地下水流动的多尺度描述，并应用于一个计算实验，该实验说明了含水层发育的一些重要影响。研究表明，与非合作地下水管理相比，合作地下水管理可以提供更高的经济效益，同时减少了储水量的消耗。然而，即使在用户合作的情况下，对水的需求仍然会推动抽水决策。在许多含水层中，抽水的好处必然伴随着含水层流出量的减少和地下水储备的枯竭，无论是合作管理还是非合作管理。当抽水受到油井产量限制或含水层流出物的转移受到限制时，这些效益会显著降低。我们的整体分析强调了将含水层管理视为更大的资源分配问题的一部分的重要性，该问题考虑了井运营商、下游用户和未来资源消费者的相互冲突的需求。
Unsustainable depletion of aquifer storage and diversion of groundwater from downstream users continue to be serious problems, even though their adverse effects are widely recognized. Groundwater depletion involves interactions between economically motivated pumping decisions and physical constraints. Here, we investigate these interactions by using optimal control techniques to describe the pumping decisions of economic agents who share an aquifer. Our approach relies on a multi‐scale description of unconfined groundwater flow, applied to a computational experiment that illustrates some important impacts of aquifer development. We show that cooperative groundwater management can provide higher economic benefits, with less storage depletion, than an uncooperative alternative. However, demand for water still drives pumping decisions, even when users cooperate. In many aquifers the benefits of pumping are necessarily accompanied by a reduction in aquifer outflow and by depletion of the groundwater reserve, for both cooperative and uncooperative management. These benefits decrease significantly when pumping is limited by well yield constraints or when the diversion of aquifer outflow is restricted. Our overall analysis emphasizes the importance of viewing aquifer management as part of a larger resource allocation problem that considers the conflicting needs of well operators, downstream users, and future consumers of the resource.