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首页> 外文期刊>Journal of Contaminant Hydrology >Application of the re-circulating tracer well test method to determine nitrate reaction rates in shallow unconfined aquifers
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Application of the re-circulating tracer well test method to determine nitrate reaction rates in shallow unconfined aquifers

机译：循环示踪井测试法在浅层无限制含水层中硝酸盐反应速率测定中的应用

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摘要

Five re-circulating tracer well tests (RCTWTs) have been conducted in a variety of aquifer settings, at four sites across New Zealand. The tests constitute the first practical assessment of the two-well RCTWT methodology described by Burbery and Wang (Journal of Hydrology, 2010; 382:163-173) and were aimed at evaluating nitrate reaction rates in situ. The performance of the RCTWTs differed significantly at the different sites. The RCTWT method performed well when it was applied to determine potential nitrate reaction rates in anoxic, electro-chemically reductive, nitrate-free aquifers of volcanic lithology, on the North Island, New Zealand. Regional groundwater flow was not fast-flowing in this setting. An effective first-order nitrate reaction rate in the region of 0.09 d~(-1) to 0.26 d~(-1) was determined from two RCTWTs applied at one site where a reaction rate of 0.37 d~(-1) had previously been estimated from a push-pull test The RCTWT method performed poorly, however, in a fast-flowing, nitrate-impacted fluvio-glacial gravel aquifer that was examined on the South Island, New Zealand. This setting was more akin to the hypothetical physiochemical problem described by Burbery and Wang (2010). Although aerobic conditions were identified as the primary reason for failure to measure any nitrate reaction in the gravel aquifer, failure to establish significant interflow in the re-circulation cell due to the heterogeneous nature of the aquifer structure, and natural variability exhibited in nitrate contaminant levels of the ambient groundwater further contributed to the poor performance of the test. Our findings suggest that in practice, environmental conditions are more complex than assumed by the RCTWT methodology, which compromises the practicability of the method as one for determining attenuation rates in groundwater based on tracing ambient contaminant levels. Although limited, there appears to be a scope for RCTWTs to provide useful information on potential attenuation rates when reactants are supplemented to the aquifer system under examination.
机译：在新西兰四个地区的各种含水层环境中进行了五次循环示踪剂井测试（RCTWT）。这些测试构成了Burbery和Wang（《水文学杂志》，2010; 382：163-173）描述的双井RCTWT方法的首次实践评估，旨在评估硝酸盐的原位反应速率。在不同地点，RCTWT的性能差异很大。当将RCTWT方法用于确定新西兰北岛火山岩性的缺氧，电化学还原，无硝酸盐的含水层中的潜在硝酸盐反应速率时，该方法表现良好。在这种情况下，区域地下水流量不是快速流动的。从在一个部位先前施加0.37 d〜（-1）的反应速率的两个RCTWT确定了一个有效的一阶硝酸盐反应速率在0.09 d〜（-1）至0.26 d〜（-1）范围内。由推挽试验估算得出。RCTWT方法的性能较差，但是在新西兰南岛检查的快速流动，受硝酸盐影响的河流-冰砾石含水层中，RCTWT方法表现不佳。此设置更类似于Burbery和Wang（2010）所描述的假设物理化学问题。尽管有氧条件被确定为无法测量砾石含水层中任何硝酸盐反应的主要原因，但由于含水层结构的异质性，未能在再循环池中建立明显的内流，并且硝酸盐污染物水平表现出自然的可变性的地下水进一步加剧了测试的性能。我们的发现表明，实际上，环境条件比RCTWT方法所假设的更为复杂，这损害了该方法作为根据追踪环境污染物水平确定地下水衰减率的方法的实用性。尽管有一定的限制，但是当将反应物添加到正在检查的含水层系统中时，RCTWT似乎可以提供有关潜在衰减率的有用信息。

著录项

  • 来源
    《Journal of Contaminant Hydrology》 |2013年第2期|1-9|共9页
  • 作者

    Lee F. Burbery; Mark J. Flintoft; Murray E. Close;

  • 作者单位

    Institute of Environmental Science and Research, PO Box 29-181, Christchurch, New Zealand,Lincoln Ventures Ltd., Lincoln University. Christchurch, New Zealand;

    Institute of Environmental Science and Research, PO Box 29-181, Christchurch, New Zealand,Aqualinc Research Ltd, PO Box 20-462, Bishopdale, Christchurch, New Zealand;

    Institute of Environmental Science and Research, PO Box 29-181, Christchurch, New Zealand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    re-circulating tracer well test; nitrate reaction rate measurement; in situ; new zealand;

    机译：循环示踪剂试井;硝酸盐反应速率测量;原位新西兰;

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