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首页> 外文期刊>Canadian Water Resources Journal >Using water stable isotopes for tracing surface and groundwater flow systems in the Barlow-Ojibway Clay Belt, Quebec, Canada
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Using water stable isotopes for tracing surface and groundwater flow systems in the Barlow-Ojibway Clay Belt, Quebec, Canada

机译：使用水稳定同位素追踪加拿大魁北克Barlow-Ojibway粘土带的地表水和地下水流系统

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摘要

This study aims to improve the understanding of surface and groundwater flow systems based on water stable isotope data in a 19,549 km(2) region of the Barlow-Ojibway Clay Belt, in western Quebec, Canada. The available geochemical database contains 645samples including precipitation, snow cores, surface waters, groundwater and springs. All samples were analyzed for water stable isotopes (delta H-2-delta O-18) and complementary tritium analyses were conducted on 98 groundwater and spring samples. Precipitations depict a clear temperature-dependent seasonal pattern and define a local meteoric water line (LMWL) without a latitudinal trend in delta H-2-delta O-18. Samples collected from the snowpack plot on the LMWL, suggesting that the bulk snowpack preserves the isotopic composition of precipitation throughout the frozen period, prior to the spring snowmelt. Surface water samples define a local evaporation line (LEL), and evaporation over inflow (E/I) ratios range between 0 and 36%. Groundwater and spring samples are evenly distributed around the LMWL, suggesting that evaporation processes are limited prior to infiltration and that surface waters do not significantly contribute to groundwater recharge. Shallow unconfined aquifers present a greater variability in delta H-2-delta O-18 compared to confined aquifers located farther down gradient, suggesting the mixing of varied recharge waters along the regional groundwater flow system. A three-component mixing model based on isotopic and specific electrical conductivity data allows the quantification of such mixing processes. The interpretation of isotopic data constrains a regional-scale conceptual model of groundwater flow systems and describes processes related to the timing of recharge, evaporation, mixing and discharge.
机译：这项研究旨在基于加拿大魁北克省Barlow-Ojibway粘土带19,549 km（2）地区的水稳定同位素数据，增进对地表水和地下水流动系统的了解。现有的地球化学数据库包含645个样本，包括降水，雪芯，地表水，地下水和泉水。分析了所有样品的水稳定同位素（δH-2-δO-18），并对98个地下水和春季样品进行了补充complementary分析。降水描绘了一个清晰的温度相关季节模式，并定义了一个三角洲H-2-三角洲O-18中没有纬度趋势的局部流水线（LMWL）。从LMWL积雪堆图上收集的样本表明，大积雪在春季融雪之前的整个冰冻期都保留了同位素组成。地表水样品定义了一条局部蒸发线（LEL），蒸发量与流入量（E / I）的比率范围为0％至36％。地下水和泉水样品在LMWL周围均匀分布，这表明在渗透之前蒸发过程受到限制，并且地表水对地下水的补给没有显着贡献。与位于更深的梯度下方的承压含水层相比，浅层无承压含水层的δH-2-delta O-18波动性更大，这表明沿区域地下水流系统混合了各种补给水。基于同位素和比电导率数据的三组分混合模型可以量化此类混合过程。同位素数据的解释约束了地下水流动系统的区域尺度概念模型，并描述了与补给，蒸发，混合和排放时间有关的过程。

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  • 来源
    《Canadian Water Resources Journal》 |2018年第2期|173-194|共22页
  • 作者

    Rey Nathalie; Rosa Eric; Cloutier Vincent; Lefebvre Rene;

  • 作者单位

    Univ Quebec Abitibi Temiscamingue, Inst Rech Mines & Environm, Grp Rech Eau Souterraine, Amos, PQ, Canada;

    Univ Quebec Abitibi Temiscamingue, Inst Rech Mines & Environm, Grp Rech Eau Souterraine, Amos, PQ, Canada;

    Univ Quebec Abitibi Temiscamingue, Inst Rech Mines & Environm, Grp Rech Eau Souterraine, Amos, PQ, Canada;

    Inst Natl Rech Sci, Ctr Eau Terre Environm, Quebec City, PQ, Canada;

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