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首页> 外文期刊>Canadian Water Resources Journal >Regional groundwater flow dynamics and residence times in Chaudiere-Appalaches, Quebec, Canada: Insights from numerical simulations
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Regional groundwater flow dynamics and residence times in Chaudiere-Appalaches, Quebec, Canada: Insights from numerical simulations

机译：加拿大魁北克Chaudiere-Appalaches中的区域地下水流动动力学和停留时间：来自数值模拟的见解

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摘要

As part of the Quebec PACES III provincial groundwater resources assessment programme (Programme d'acquisition des connaissances en eaux souterraines), a regional-scale two-dimensional numerical groundwater model was developed in the Chaudiere-Appalaches region, Quebec, Canada. The model considers groundwater flow, transport of groundwater age and the influence of a fault on the flow system and its implications for groundwater quality. By including deep and shallow flow systems, the study helps fill a knowledge gap with respect to intermediate flow systems and the role they would play during potential energy resource development including shale gas exploitation from the Utica Shale. Physical and chemical hydrogeological data, including an analysis of C-14 in dissolved inorganic carbon in sampled groundwater, supported a regional conceptual flow model forming the basis for numerical simulations. The numerical model is first calibrated to regional piezometry through a semi-automated workflow using the inverse model PEST. Although some evidence for deeper regional flow exists, the area appears to be dominated by local flow systems on maximum length scales of about 5 km, with significant flow through the top 40 to 60 m of the fractured sedimentary rock aquifer. This regional-scale flow model is also supported by the local hydrogeochemical signatures. Simulated mean groundwater ages show young shallow water of 100 years with rapid increases in age with depth suggesting diffusion-controlled age evolution. Groundwater age is likely being perturbed in the vicinity of the Jacques Cartier River fault, which can act as both a barrier and a preferential pathway, provided permeability contrasts with the surrounding rock are at least two orders of magnitude.
机译：作为魁北克省PACES III省级地下水资源评估计划（计划生育合作社计划）的一部分，在加拿大魁北克的Chaudiere-Appalaches地区开发了区域尺度的二维地下水数值模型。该模型考虑了地下水流量，地下水年龄的输送以及断层对流量系统的影响及其对地下水质量的影响。通过包括深流系统和浅流系统，该研究有助于填补有关中间流系统及其在潜在能源资源开发（包括从尤蒂卡页岩中开采页岩气）中扮演的角色方面的知识空白。物理和化学水文地质数据，包括对采样地下水中溶解的无机碳中C-14的分析，为形成区域数值模拟奠定了基础。首先使用逆模型PEST通过半自动化的工作流程将数值模型校准为局部测压法。尽管存在一些证据表明存在更深的区域流动，但该区域似乎由局部流动系统所控制，最大长度范围约为5 km，其中有大量流量流经裂缝性沉积岩含水层的顶部40至60 m。当地水文地球化学特征也支持这种区域尺度的流量模型。模拟的平均地下水年龄显示了<100年的年轻浅水，年龄随深度而迅速增加，表明了扩散控制的年龄演化。雅克·卡蒂埃河断裂带附近的地下水年龄很可能会受到干扰，只要与周围岩石的渗透率差异至少为两个数量级，它既可以作为屏障，也可以作为优先通道。

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  • 来源
    《Canadian Water Resources Journal》 |2018年第2期|214-239|共26页
  • 作者

    Janos D.; Molson J.; Lefebvre R.;

  • 作者单位

    Univ Laval, Dept Geol & Geol Engn, Quebec City, PQ, Canada;

    Univ Laval, Dept Geol & Geol Engn, Quebec City, PQ, Canada;

    INRS, ETE, Ctr Eau Terre Environm, Quebec City, PQ, Canada;

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