Global groundwater wells at risk of running dry
Global groundwater wells at risk of running dry
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DOI：
10.1126/science.abc2755
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发表时间：
2021-04-23
期刊：
影响因子：
56.9
通讯作者：
Perrone, Debra
中科院分区：
文献类型：
--
作者：
Jasechko, Scott;Perrone, Debra
地下威尔斯井为数十亿人供水，但当地下水位下降时，它们可能会干涸。在这里，我们分析了全球分布的3900万口威尔斯油井的施工记录。我们发现，6 - 20%的威尔斯井深不超过地下水位5米，这意味着如果地下水位下降几米，数百万的威尔斯井就有干涸的危险。此外，在一些地下水水位大幅下降的地方，新的威尔斯井并不比旧的威尔斯井深，这表明如果地下水水位继续下降，新的威尔斯井至少和旧的威尔斯井一样有可能干涸。深层含水层水质差，打井费用高，限制了开采深层地下水以避免威尔斯干涸时失去水源的有效性。
Groundwater wells supply water to billions of people, but they can run dry when water tables decline. Here, we analyzed construction records for similar to 39 million globally distributed wells. We show that 6 to 20% of wells are no more than 5 meters deeper than the water table, implying that millions of wells are at risk of running dry if groundwater levels decline by only a few meters. Further, newer wells are not being constructed deeper than older wells in some of the places experiencing significant groundwater level declines, suggesting that newer wells are at least as likely to run dry as older wells if groundwater levels continue to decline. Poor water quality in deep aquifers and the high costs of well construction limit the effectiveness of tapping deep groundwater to stave off the loss of access to water as wells run dry.