干旱环境中的碳酸盐岩含水层(突尼斯中部,西地中海省):重力和时域电磁法研究

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-02-02 DOI:10.1144/qjegh2022-121
Mohamed Hamrouni, H. Gabtni
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引用次数: 0

摘要

本研究采用重力和时域电磁(TDEM)方法研究了干旱环境(突尼斯中部、地中海西部省)碳酸盐岩含水层的地下水文地质。El Houdh盆地可以被认为是评估当今气候变化下地下水资源脆弱性的合适案例。识别影响始新世/坎帕尼亚-马斯特里赫特阶碳酸盐岩的结构背景和不连续性是识别水补给/排泄途径和制定有效和长期地下水勘探战略的重要关键。首先,我们使用特定的高斯滤波器产生了一个可用的剩余重力场。然后,我们生成了导数图、欧拉反褶积解算图和三维重力模型,以描绘不同的异常,并估计基底深度参数和地下密度对比。正负异常映射和3D重力建模表明,El Houdh盆地与一个不对称的“栖息向斜”有关,该向斜被NW–SE线性构造分割为NE-SW子盆地(局部负残余异常)。TDEM测量使用钻孔进行校准,以对岩溶饱和和非饱和带进行成像,并推断表岩溶和内岩溶的关系。最后,所提出的方法为更好地管理水文地质开发提供了一种快速而有价值的方法。主题集:本文是工程地质学和水文地质学中气候变化和复原力集的一部分,可在以下网站获取:https://www.lyellcollection.org/cc/climate-change-and-resilience-in-engineering-geology-and-hydrogeology
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Carbonate-rock aquifers in Arid Environments (Central Tunisia, Western Mediterranean province): Gravity and Time Domain Electromagnetic methods Investigations
Gravity and Time Domain Electromagnetic (TDEM) methods were used in this study to investigate the subsurface hydrogeology of the carbonate-rock aquifer in Arid Environments (Central Tunisia, Western Mediterranean province). The El Houdh basin can be considered an appropriate case for evaluating the vulnerability of groundwater resources under present-day climate change. The identification of structural context and the discontinuities affecting the Eocene/Campanian-Maastrichtian carbonates is an important key to recognize water recharge/discharge pathways and to develop effective and long-term groundwater exploration strategies. Firstly, we have produced an available residual gravity field using a specific Gaussian filter. Then, we generated derivative maps, Euler deconvolution solutions map and a 3D gravity model to delineate different anomalies and to estimate the depth-to-basement parameter and the subsurface density contrasts. Positive and negative anomalies mapping and 3D gravity modelling divulged that the El Houdh basin is associated with an asymmetric “perched syncline” with a segmentation into NE-SW sub-basins (local negative residual anomalies) separated by NW–SE lineaments. The TDEM survey was calibrated using boreholes to image the karst saturated and Unsaturated Zone and to deduce the Epikarst and Endokarst relationship. Finally, the proposed methodology presents a fast and valuable approach for better management of hydrogeological exploitation. Thematic collection: This article is part of the Climate change and resilience in Engineering Geology and Hydrogeology collection available at: https://www.lyellcollection.org/cc/climate-change-and-resilience-in-engineering-geology-and-hydrogeology
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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