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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Groundwater Flow Processes and Human Impact along the Arid US-Mexican Border Evidenced by Environmental Tracers: The Case of Tecate Baja California
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Groundwater Flow Processes and Human Impact along the Arid US-Mexican Border Evidenced by Environmental Tracers: The Case of Tecate Baja California

机译：环境示踪剂证明干旱的美墨边境的地下水流动过程及其对人类的影响：以加利福尼亚州下加利福尼亚州特卡特为例

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摘要

With the increasing population, urbanization and industry in the arid area of Tecate, there is a concomitant increase in contaminants being introduced into the Tecate River and its aquifer. This contamination is damaging the usable groundwater supply and making local residents and commercial enterprises increasingly dependent on imported water from the Colorado River basin. In this study we apply a suite of chemical and isotopic tracers in order to evaluate groundwater flow and assess contamination trends. Groundwater recharge occurs through mountain-block and mountain-front recharge at higher elevations of the ranges. Groundwater from the unconfined, alluvial aquifer indicates recent recharge and little evolution. The increase in salinity along the flow path is due to interaction with weathering rock-forming silicate minerals and anthropogenic sources such as urban wastewater, residual solids and agricultural runoff from fertilizers, livestock manure and/or septic tanks and latrines. A spatial analysis shows local differences and the impact of the infiltration of imported waters from the Colorado River basin. The general trend of impaired water quality has scarcely been documented in the last decades, but it is expected to continue. Since the groundwater system is highly vulnerable, it is necessary to protect groundwater sources.
机译：随着特卡特（Tecate）干旱地区人口，城市化和工业的增长，随之而来的污染物也随之增加到特卡特河（Tecate River）及其含水层中。这种污染正在损害可用的地下水供应，并使当地居民和商业企业越来越依赖科罗拉多河流域的进口水。在这项研究中，我们应用了一套化学和同位素示踪剂，以评估地下水流量和评估污染趋势。地下水补给是通过山脉和山前补给在该范围的较高海拔处发生的。无限制的冲积含水层中的地下水表明近期补给，几乎没有演化。沿流径的盐度增加是由于与风化成岩的硅酸盐矿物和人为来源（例如城市废水，残留固体和化肥，牲畜粪便和/或化粪池和厕所的农业径流）相互作用所致。空间分析显示了局部差异以及科罗拉多河流域的进口水渗透的影响。在过去的几十年中，几乎没有记录到水质受损的总体趋势，但是预计这种趋势将持续下去。由于地下水系统非常脆弱，因此有必要保护地下水源。

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