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Evaluation of Groundwater Sources, Flow Paths, and Residence Time of the Gran Desierto Pozos, Sonora, Mexico

机译:墨西哥索诺拉州Gran Desierto Pozos的地下水来源,流动路径和停留时间的评估

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Environmental isotopes and water chemistry distinguish water types, aquifer recharge mechanisms, and flow paths in the Gran Desierto and Colorado River delta aquifer. The aquifer beneath the Gran Desierto supports a series of spring-fed wetlands, locally known as pozos, which have provided vital water resources to diverse flora and fauna and to travelers who visited the area for millennia. Stable isotope data shows that local recharge originates as winter precipitation, but is not the main source of water in the pozos. Instead, Colorado River water with substantial evaporation is the main component of water in the aquifer that feeds the pozos. Before infiltration, Colorado River water was partially evaporated in an arid wetland environment. Groundwater followed flow paths, created by the Altar Fault, into the current location of the pozos at Bahía Adair. Mixing with seawater is observed at the pozos located near the coast of the Gulf of California. The wetlands or other natural settings that allowed recharge to the aquifer feeding the pozos no longer exist. This leaves the pozos vulnerable to major groundwater pumping and development in the area.
机译:环境同位素和水化学可以区分格兰德西托(Gran Desierto)和科罗拉多河三角洲含水层中的水类型,含水层补给机理和流动路径。大Desierto下方的蓄水层支撑着一系列春季养护的湿地,当地人称为pozos,这些湿地为各种动植物和来访该地区数千年的旅行者提供了至关重要的水资源。稳定的同位素数据表明,局部补给源于冬季降水,但并不是火山灰中的主要水源。取而代之的是,科罗拉多河中大量蒸发的水是为火山灰提供水的含水层中水的主要成分。在渗透之前,科罗拉多河水在干旱的湿地环境中被部分蒸发。地下水沿着祭坛断层所形成的流动路径进入巴伊亚阿代尔火山的当前所在地。在加利福尼亚湾海岸附近的火山口中发现海水与海水混合。湿地或其他自然环境允许给蓄水层补给火山灰,不再存在。这使得火山灰易受该地区主要的地下水抽取和开发的影响。

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