美国大峡谷开巴布高原岩溶-硅屑含水层泉水流量地球化学变异特征

IF 1 4区 工程技术 Q4 ENGINEERING, ENVIRONMENTAL
Alexander J. Wood, A. Springer, B. Tobin
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引用次数: 3

摘要

在建立基准线含水层特征时,了解从岩性变化的含水层中流出的泉水的地下水源区是至关重要的。来自水文地层露头的地层数据和来自泉水的地球化学数据被用来描述一个偏远的、数据贫乏的含水层的水文地质特征。本文研究了美国大峡谷国家公园北部凯巴布高原浅层岩溶-硅-碎屑科科尼诺(C)含水层的水文地质变异性。在18个月的时间里,从8个地点收集了地层资料,并对22个C含水层泉进行了采样。稳定同位素分析表明,地下水倾向于以雪的形式冬季补给,并且在所有C含水层泉的地下水储存区显示出相似的同位素特征。地层分析表明,C含水层主要含水单元自南向北明显变薄,其正上方为蒸发岩相。主成分分析(PCA)表明,水文地球化学受SO42−、Cl−、Mg2+、Ca+、比电导率、碱度和δD变率的影响。地层变异影响着多个地点的地球化学,并具有与岩性变化相关的地球化学变异。在主成分分析结果的基础上,根据地球化学变率圈定了地下水子流域。该研究为土地管理者和岩溶水文地质学家提供了新的分析工具,通过地层评价和高分辨率数据来评价岩性复杂的含水层。具有成本效益的地层分析和高分辨率的春季采样可以而且应该用于评估偏远、数据贫乏地区岩性复杂的含水层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geochemical Variability in Karst-Siliciclastic Aquifer Spring Discharge, Kaibab Plateau, Grand Canyon
The source area of groundwater for springs discharging from lithologically variably perched aquifers is essential to understand when establishing baseline aquifer characteristics. Stratigraphic data from hydrostratigraphic outcrops and geochemical data from springs were used to characterize the hydrogeology of a remote, data-poor aquifer. This study focuses on the hydrogeological variability within the shallow karst-siliciclastic Coconino (C) aquifer on the Kaibab Plateau, north of Grand Canyon National Park. Stratigraphic data were collected from 8 locations, and 22 C aquifer springs were sampled for 18 months. Stable isotope analyses indicate that groundwater is biased to winter recharge in the form of snow and shows similar isotopic signature for groundwater storage areas for all C aquifer springs. Stratigraphic analyses show that the primary water-bearing unit in the C aquifer thins dramatically from south to north and has evaporite lithofacies directly above the unit. Principal component analysis (PCA) indicates that the hydrogeochemistry is influenced by SO42−, Cl−, Mg2+, Ca+, specific conductivity, alkalinity, and δD variability. The stratigraphic variability influences geochemistry at multiple locations and has geochemical variabilities that correlate with changing lithology. Based on the PCA results, groundwater sub-basins were delineated based on geochemical variability. This study provides new analytical tools for land managers and karst hydrogeologists to evaluate lithologically complex aquifers by evaluating the stratigraphy and with high-resolution data. Cost-effective stratigraphic analyses and high-resolution spring sampling can and should be used to evaluate lithologically complex aquifers in remote, data-poor regions.
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来源期刊
Environmental & Engineering Geoscience
Environmental & Engineering Geoscience 地学-地球科学综合
CiteScore
2.10
自引率
0.00%
发文量
25
审稿时长
>12 weeks
期刊介绍: The Environmental & Engineering Geoscience Journal publishes peer-reviewed manuscripts that address issues relating to the interaction of people with hydrologic and geologic systems. Theoretical and applied contributions are appropriate, and the primary criteria for acceptance are scientific and technical merit.
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