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首页> 外文期刊>Hydrogeology journal >Significance of enhanced infiltration due to groundwater extraction on the disappearance of a headwater lagoon system: Toluca Basin, Mexico
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Significance of enhanced infiltration due to groundwater extraction on the disappearance of a headwater lagoon system: Toluca Basin, Mexico

机译：地下水抽取导致的渗透增加对上游水泻湖系统消失的意义：墨西哥托卢卡盆地

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摘要

Mexico City relies significantly on groundwater resources drawn from the Sistema Lerma well field located in the Toluca Basin, Mexico. Enhanced infiltration caused by groundwater extraction is suspected to be both a prime factor in the disappearance of a lagoon system at the Toluca Basin and a potential risk to long-term groundwater quality. A combined approach of field investigation and numerical modeling was adopted to assess the groundwater-surface water interactions within the lagoon system. Potentiometric data indicate that current downward vertical hydraulic gradients below the lagoon and surrounding wetland area are extremely low suggesting very slow infiltration rates. Geochemical and isotope data from surface water and groundwater sampling also indicate that very little surface water infiltration has occurred. Numerical simulations demonstrate that enhanced surface water infiltration is unlikely to be the primary cause in the significant reduction in size of the lagoon system. Other factors such as modifications to the surface water drainage system and capture of spring flow from the surrounding mountainous regions are likely more significant. Simulations also suggest that contaminants originating in the lagoon system are currently entering nearby production wells although the total contaminant mass flux to the wells is still very low and significantly diluted.
机译：墨西哥城严重依赖从位于墨西哥Toluca盆地的Sistema Lerma井田汲取的地下水资源。怀疑由地下水提取引起的渗透增加既是图卢卡盆地泻湖系统消失的主要因素，又是长期地下水质量的潜在风险。采用野外调查和数值模拟相结合的方法来评估泻湖系统内的地下水-地表水相互作用。电位数据表明，目前泻湖和周围湿地面积以下的向下垂直水力梯度极低，表明渗透速度非常慢。来自地表水和地下水采样的地球化学和同位素数据也表明很少发生地表水渗透。数值模拟表明，增加地表水的渗透率不可能是泻湖系统尺寸显着减小的主要原因。其他因素，例如对地表排水系统的修改以及从周围山区捕获泉水，可能更为重要。模拟还表明，尽管流向井的总污染物质量通量仍然非常低且已被充分稀释，但来自泻湖系统的污染物目前正在进入附近的生产井。

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