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Detection of Mixing Dynamics During Pumping of a Flooded Coal Mine

机译：淹没煤矿抽水过程中混合动力的检测

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In complex hydrogeological environments the effective management of groundwater quality problems by pump-and-treat operations can be most confidently achieved if the mixing dynamics induced within the aquifer by pumping are well understood. The utility of isotopic environmental tracers (C-, H-, O-, S-stable isotopic analyses and age indicators-~(14)C, ~3H) for this purpose is illustrated by the analysis of a pumping test in an abstraction borehole drilled into flooded, abandoned coal mineworkings at Deerplay (Lancashire, UK). Interpretation of the isotope data was undertaken conjunctively with that of major ion hydrochemistry, and interpreted in the context of the particular hydraulic setting of flooded mineworkings to identify the sources and mixing of water qualities in the groundwater system. Initial pumping showed breakdown of initial water quality stratification in the borehole, and gave evidence for distinctive isotopic signatures (δ~(34)S(SO4) ≌-1.6‰, δ~(18)O(SO_4) ≌ +15‰) associated with primary oxidation of pyrite in the zone of water table fluctuation-the first time this phenomenon has been successfully characterized by these isotopes in a flooded mine system. The overall aim of the test pumping-to replace an uncontrolled outflow from a mine entrance in an inconvenient location with a pumped discharge on a site where treatment could be provided-was swiftly achieved. Environmental tracing data illustrated the benefits of pumping as little as possible to attain this aim, as higher rates of pumping induced in-mixing of poorer quality waters from more distant old workings, and/or renewed pyrite oxidation in the shallow subsurface.
机译：在复杂的水文地质环境中，如果对泵送引起的含水层内的混合动力有了充分的了解，那么最有信心地实现通过泵送和处理操作对地下水质量问题的有效管理。同位素环境示踪剂（C，H，O，S稳定同位素分析和年龄指标〜（14）C，〜3H）在此目的的实用性通过对抽象钻孔中的抽水测试进行了分析说明在Deerplay（英国兰开夏郡）钻进了洪水淹没的废弃煤矿。同位素数据的解释与主要离子水化学的解释同时进行，并在淹没的矿山的特定水力环境下进行了解释，以识别地下水系统中水的来源和水质混合情况。初始抽水显示出井眼中初始水质分层的破裂，并提供了与之相关的独特同位素特征的证据（δ〜（34）S（SO4）≌-1.6‰，δ〜（18）O（SO_4）≌+ 15‰）在地下水位波动区域黄铁矿的一次氧化作用下，这种现象首次被淹没的矿山系统中的这些同位素成功地表征。快速实现了测试泵送的总体目标，即用不便之处的矿井入口处的不受控制的流出物替换为可提供处理场所的泵送排放物。环境跟踪数据说明了为达到该目的而尽可能少地抽水的好处，因为较高的抽水速度会导致来自较远距离的旧作业的质量较差的水混入和/或浅地下的黄铁矿重新发生氧化。

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  • 来源
    《Ground water》 |2014年第2期|251-263|共13页
  • 作者

    Trevor Elliot; Paul L. Younger;

  • 作者单位

    Environmental Tracers Laboratory,Environmental Engineering Research Centre, School of Planning,Architecture and Civil Engineering, Queen's University Belfast,Belfast BT9 5AG , UK;

    School of Engineering, University of Glasgow, James Watt Building (South), Glasgow G12 8QQ, UK;

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