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首页> 外文期刊>Ground Water Monitoring & Remediation >Relative Vulnerability of Public Supply Wells to VOC Contamination in Hydrologically Distinct Regional Aquifers
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Relative Vulnerability of Public Supply Wells to VOC Contamination in Hydrologically Distinct Regional Aquifers

机译：在水文上不同的区域含水层中，公共供应井对VOC污染的相对脆弱性

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摘要

A process-based methodology was used to compare the vulnerability of public supply wells tapping seven study areas in four hydrologically distinct regional aquifers to volatile organic compound (VOC) contamination. This method considers (1) contributing areas and travel times of groundwater flowpaths converging at individual supply wells, (2) the oxic and/or anoxic conditions encountered along each flowpath, and (3) the combined effects of hydrodynamic dispersion and contaminant- and oxic/anoxic-specific biodegradation. Contributing areas and travel times were assessed using particle tracks generated from calibrated regional groundwater flow models. These results were then used to estimate VOC concentrations relative to an unspecified initial concentration (C/C_0) at individual public supply wells. The results show that the vulnerability of public supply wells to VOC contamination varies widely between different regional aquifers. Low-recharge rates, long travel times, and the predominantly oxic conditions characteristic of Basin and Range aquifers in the western United States leads to lower vulnerability to VOCs, particularly to petroleum hydrocarbons such as benzene and toluene. On the other hand, high recharge rates and short residence times characteristic of the glacial aquifers of the eastern United States leads to greater vulnerability to VOCs. These differences lead to distinct patterns of C/C_0 values estimated for public supply wells characteristic of each aquifer, information that can be used by resource managers to develop monitoring plans based on relative vulnerability, to locate new public supply wells, or to make land-use management decisions.
机译：使用基于过程的方法来比较在四个水文学上不同的区域含水层中的七个研究区域开采的公共供应井对挥发性有机化合物（VOC）污染的脆弱性。该方法考虑了（1）在各个供水井汇合的地下水流径的贡献面积和传播时间；（2）沿每个流径遇到的有氧和/或无氧条件；以及（3）流体动力扩散与污染物和含氧量的综合作用/缺氧特异性生物降解。使用从校准的区域地下水流模型生成的粒子轨迹评估贡献面积和旅行时间。然后将这些结果用于估计各个公共供应井中VOC的浓度相对于未指定的初始浓度（C / C_0）。结果表明，不同区域含水层之间公共供应井对VOC污染的脆弱性差异很大。低补给率，长途旅行时间以及美国西部盆地和山脉含水层的主要含氧条件导致对VOC的抵抗力降低，特别是对石油碳氢化合物（如苯和甲苯）的脆弱性更低。另一方面，美国东部冰川含水层的高补给率和短停留时间导致其对VOC的更大脆弱性。这些差异导致针对每个含水层特征的公共供应井所估算的C / C_0值的模式不同，资源管理者可以使用这些信息来基于相对脆弱性制定监测计划，定位新的公共供应井或建造土地。使用管理决策。

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    《Ground Water Monitoring & Remediation》 |2010年第4期|p.54-63|共10页
  • 作者

    Leon J. Kauffman; Francis H. Chapelle;

  • 作者单位

    U.S. Geological Survey, New Jersey Water Science Center, 810 Bear Tavern Road, West Trenton, NJ 08628;

    U.S. Geological Survey, South Carolina Water Science Center, 720 Gracern Road, Suite 129, Columbia, SC 29210;

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