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Effects of shield brine on the safe disposal of waste in deep geologic environments

机译：屏蔽盐水对深层地质环境中废物安全处置的影响

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摘要

The salinity of groundwater increases with depth in the Canadian Shield (up to 1.3 kg/L of density). The existence of brine can be critically important for the safe geologic disposal of radioactive wastes, as dense brine can significantly retard the upward migration of radionuclides released from repositories. Static and flushing conditions of the deep brine are analyzed using a U-tube analogy model. Velocity reduction due to the presence of dense brine is derived under flushing conditions. A set of illustrative numerical simulations in a two-dimensional cross section is presented to demonstrate that dense brine can significantly influence regional groundwater flow patterns in a shield environment. It is implied from the results that (1) the existence of Shield brine can be an indicator of a hydrogeologically stable environment, (2) activities near ground surface may not perturb the stable groundwater environment in the deep brine region, and thus, (3) the deep brine region can be considered as a candidate geologic site for the safe disposal of waste. In addition to brine, other issues associated with long-term waste disposal, such as geological, glacial and seismic events, may need to be considered for the safe storage of spent nuclear fuel in a shield environment.
机译：地下水的盐度随着加拿大盾构深度的增加而增加（密度高达1.3 kg / L）。盐水的存在对于放射性废物的安全地质处置至关重要，因为浓盐水会大大阻碍从处置库释放的放射性核素的向上迁移。使用U型管模型分析深层盐水的静态和冲洗条件。在冲洗条件下，由于存在浓盐水而导致速度降低。提出了一组在二维截面中的说明性数值模拟，以证明浓盐水可以显着影响盾构环境中的区域地下水流型。结果表明，（1）Shield盐水的存在可以指示水文地质稳定的环境；（2）地表附近的活动可能不会干扰深盐水区域的稳定地下水环境，因此，（3 ）深盐水区可被视为安全处置废物的候选地质地点。除了盐水之外，还可能需要考虑与长期废物处理相关的其他问题，例如地质，冰川和地震事件，以便在屏蔽环境中安全存储乏核燃料。

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  • 来源
    《Advances in Water Resources》 |2009年第8期|1352-1358|共7页
  • 作者

    Y.-J. Park; E.A. Sudicky; J.F. Sykes;

  • 作者单位

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3C1;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3C1;

    Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3C1;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    brine; canadian shield; waste disposal; velocity reduction;

    机译：盐水;加拿大盾废物处理;速度降低;

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