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首页> 外文期刊>Ground Water Monitoring & Remediation >Vertical Wellbore Flow Monitoring for Assessing Spatial and Temporal Flow Relationships with a Dynamic River Boundary
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Vertical Wellbore Flow Monitoring for Assessing Spatial and Temporal Flow Relationships with a Dynamic River Boundary

机译：垂直井眼流量监测，用于评估具有动态河流边界的时空流量关系

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A useful tool for identifying the temporal and spatial ambient wellbore flow relationships near a dynamic river boundary is to monitor ambient vertical wellbore flow with an electromagnetic borehole flowmeter. This is important because the presence of the wellbore can result in significant mixing or exchange of groundwater vertically across the aquifer. Mixing or exchanging groundwater within the well-screen section can have significant impacts on the distribution of contaminants within the aquifer and adverse effects on the representativeness of groundwater samples collected from the monitoring well. Ambient monitoring data, collected from long screened wells at Hanford's 300-Area Integrated Field Research Challenge site, located approximately 260 m from the Columbia River, demonstrate that vertical wellbore flow exhibits both a positive and inverse temporal relationship with periodic river-stage fluctuations that can change over short distances between wells. The spatial distribution of these vertical flows across the well field indicates two general regions of ambient wellbore flow behavior. The western region of the site is characterized by vertical flows that are positively related to river-stage fluctuations. In contrast, the eastern region of the site exhibits vertical flows that are inversely related to river-stage fluctuations. The cause of this opposite relationship is not completely understood; however, the positive relationships appear to be associated with high-energy Hanford formation flood deposits. These flood deposits have a well-defined northwest-southeast trend and are believed to coincide with a local paleochannel. The inverse relationships are attributed to an erosional, subsurface high in the Hanford/Ringold Formation contact between the site and the Columbia River. Under these complex hydrogeologic and hydro-dynamic conditions, the behavior of ambient vertical wellbore flow in monitoring wells near a dynamic river boundary can have important implications for collecting groundwater-quality samples, for contributing to contaminant distribution within an aquifer system, and for implementing effective remediation strategies.
机译：用于识别动态河流边界附近的时间和空间环境井筒流动关系的有用工具是使用电磁钻孔流量计监测环境垂直井筒流动。这很重要，因为井筒的存在会导致整个含水层中地下水的明显混合或交换。在滤网段内混合或交换地下水可能会对含水层内污染物的分布产生重大影响，并对从监测井收集的地下水样品的代表性产生不利影响。从位于距离哥伦比亚河约260 m的汉福德300区域综合田间研究挑战场的长筛选井中收集的环境监测数据表明，垂直井眼流量与时间周期的周期性波动具有正向和反向时间关系，可以改变孔之间的短距离。这些垂直流在井场上的空间分布表明环境井筒流动行为的两个大致区域。该站点的西部地区的特征是垂直流与河段波动成正相关。相反，该地点的东部地区表现出垂直流动，而垂直流动与河段波动成反比。这种相反关系的原因尚不完全清楚。但是，正相关关系似乎与高能汉福德地层洪水沉积有关。这些洪水沉积物具有明确的西北东南方向，并被认为与当地的古河道相吻合。这种反比关系归因于该场地与哥伦比亚河之间的汉福德/林戈德组接触中的一个侵蚀性地下高度。在这些复杂的水文地质和水动力条件下，环境动态垂直井眼在监测动态河流边界附近的井眼中的行为可能对收集地下水水质样本，促进含水层系统内的污染物分布以及实​​现有效的水质监测具有重要意义。补救策略。

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  • 来源
    《Ground Water Monitoring & Remediation》 |2010年第4期|p.123-135|共13页
  • 作者

    D.R. Newcomer; B.N. Bjornstad; V.R. Vermeul;

  • 作者单位

    Pacific Northwest National Laboratory, P.O. Box 999, MS K6-96,Richland, Washington 99352;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352;

    rnPacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352;

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