评估基岩露天钻孔中环境地下水流的蒙特卡洛化学预算方法

IF 1.8 4区 环境科学与生态学 Q3 WATER RESOURCES
Philip T. Harte
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引用次数: 0

摘要

在低渗透性岩石中,使用传统的钻孔流量计工具可能无法检测到露天钻孔中的地下水流,因此可能需要使用其他方法来识别水流。了解露天钻孔中的环境水流对于追踪地下水的交叉污染非常重要。使用一种新方法和名为 AFCE(水-流-浓度-估算器)的相关软件程序,对晶体岩含水层(三个露天钻孔中的两个)和粉砂岩含水层(三个露天钻孔中的一个)中三个露天钻孔的氯化挥发性有机化合物(CVOC)浓度进行了研究。该程序可通过蒙特卡洛模拟和化学预算方法对耦合化学数据集进行比较,以评估开放式钻孔中的环境地下水流。比较所需的耦合数据集包括:(1) 来自离散裂缝的地下水样本中的 CVOC 水浓度,如通过临时部署的跨孔封隔器组件测得的浓度;(2) 来自同一开放井眼内的被动采样器垂直剖面测得的开放井眼(井筒)水浓度。由于被动采样器的结果代表了环境地下水流条件下离散采样结果的复合混合物,可能比例未知,因此通过耦合数据集之间的比较,可以分辨出 CVOC 可能来自离散裂缝(或裂缝带)的水,以及哪些裂缝可能主导了开放井眼的水化学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Monte-Carlo Chemical Budget Approach to Assess Ambient Groundwater Flow in Bedrock Open Boreholes

In low-permeability rocks, ambient groundwater flow in open boreholes may go undetected using conventional borehole-flowmeter tools and alternative approaches may be needed to identify flow. Understanding ambient flow in open boreholes is important for tracking of cross contamination in groundwater. Chlorinated volatile organic compound (CVOC) concentrations from three open boreholes set in a crystalline-rock aquifer (two of three open boreholes) and a siltstone aquifer (one of three open boreholes) were examined using a new approach and associated software program called the AFCE (Aqueous-Flow-Concentration-Estimator). The program allows comparison of coupled chemical datasets through a Monte-Carlo simulation and a chemical-budget approach to assess ambient groundwater flow in open boreholes. The coupled datasets required for the comparison include aqueous CVOC concentrations from groundwater samples from (1) discrete fractures, such as those measured from temporary deployment of straddle-borehole packer assemblies; and (2) the concentration of the open borehole (wellbore) water, as measured by a vertical profile of passive samplers from within the same open borehole. Because results from the passive samplers represent a composite mixture of the results from the discrete samples under ambient groundwater-flow conditions, potentially at unknown proportions, the comparison between coupled datasets affords the ability to discern likely water contributions of CVOC from discrete fractures (or fracture zones), and which fractures may be dominating the water chemistry of the open borehole.

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来源期刊
CiteScore
3.30
自引率
10.50%
发文量
60
审稿时长
>36 weeks
期刊介绍: Since its inception in 1981, Groundwater Monitoring & Remediation® has been a resource for researchers and practitioners in the field. It is a quarterly journal that offers the best in application oriented, peer-reviewed papers together with insightful articles from the practitioner''s perspective. Each issue features papers containing cutting-edge information on treatment technology, columns by industry experts, news briefs, and equipment news. GWMR plays a unique role in advancing the practice of the groundwater monitoring and remediation field by providing forward-thinking research with practical solutions.
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