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Control of fracture networks on a coastal karstic aquifer: a case study from northeastern Yucatán Peninsula (Mexico)
Hydrogeology Journal ( IF 2.8 ) Pub Date : 2020-10-01 , DOI: 10.1007/s10040-020-02237-4
Juan Carlos Zamora-Luria , Jorge Adrián Perera-Burgos , Alfredo González-Calderón , Luis E. Marin Stillman , Rosa Ma. Leal-Bautista

The Yucatán Peninsula karst aquifer in southeastern Mexico is important because it is the only source of freshwater supply in the region. Along the eastern coast, the aquifer behaves as a shallow unconfined aquifer, and one of its main characteristics is the development of a complex network of karstic conduits. Electrical resistivity tomography (ERT) is a geophysical technique that provides reliable information on aquifer properties that can be applied to karst. With this in mind, ERT surveys (with dipole-dipole and Wenner arrays) together with vertical profiles of groundwater electrical conductivity were obtained in the northeast of Yucatán Peninsula in the Akumal zone. The objective was to evaluate the characteristic structure of the unsaturated and saturated areas, and to determine the importance of factors at a local level that affect the thickness of the freshwater lens, as well as groundwater flow directions near the coast. The results of the ERT sections show a thin vadose zone with resistivity values greater than 1,052 Ωm and a saturated zone with resistivity values that vary from 1 to 1,052 Ωm, and show the presence of dissolution conduits and fracture zones that are affecting the freshwater lens of the aquifer. In addition, water-table measurements show the role of fracture networks in the groundwater flow. The overall results indicate conditions for a possible microbasin in the Akumal zone, highlighting the importance of local fractures, which could work as groundwater divides along the eastern coast of the Yucatán Peninsula.



中文翻译:

沿海岩溶含水层裂缝网络的控制:以尤卡坦半岛东北部(墨西哥)为例

墨西哥东南部的尤卡坦半岛岩溶含水层非常重要,因为它是该地区唯一的淡水供应来源。沿东海岸,含水层的表现为浅层无限制含水层,其主要特征之一是形成了复杂的岩溶导管网络。电阻层析成像(ERT)是一种地球物理技术,可提供有关可应用于岩溶的含水层特性的可靠信息。考虑到这一点,在尤卡坦半岛东北部的艾库玛尔地区获得了ERT调查(使用偶极-偶极子和Wenner阵列)以及地下水电导率的垂直剖面。目的是评估非饱和和饱和区域的特征结构,并确定影响淡水透镜厚度以及沿海附近地下水流动方向的局部因素的重要性。ERT区段的结果显示出电阻率值大于1,052Ωm的薄渗带区和电阻率值在1到1,052Ωm之间的饱和区,并显示了溶蚀导管和断裂带的存在,它们影响着淡水晶状体。含水层。此外,地下水位测量显示了裂缝网络在地下水流中的作用。总体结果表明,在艾库玛尔地区可能存在的微盆地的条件,突显了局部裂缝的重要性,这可能随着尤卡坦半岛东海岸的地下水分流而发挥作用。以及海岸附近的地下水流向。ERT区段的结果显示出电阻率值大于1,052Ωm的薄渗带区和电阻率值在1到1,052Ωm之间的饱和区,并显示了溶蚀导管和断裂带的存在,它们影响着淡水晶状体。含水层。此外,地下水位测量显示了裂缝网络在地下水流中的作用。总体结果表明,在艾库玛尔地区可能存在的微盆地的条件,突显了局部裂缝的重要性,这可能随着尤卡坦半岛东海岸的地下水分流而发挥作用。以及海岸附近的地下水流向。ERT区段的结果显示出电阻率值大于1,052Ωm的薄渗带区和电阻率值在1到1,052Ωm之间的饱和区,并显示了溶蚀导管和断裂带的存在,它们影响着淡水晶状体。含水层。此外,地下水位测量显示了裂缝网络在地下水流中的作用。总体结果表明,在艾库玛尔地区可能存在的微盆地的条件,突显了局部裂缝的重要性,这可能随着尤卡坦半岛东海岸的地下水分流而发挥作用。并显示出溶解导管和裂缝带的存在,这些裂缝和裂缝带正在影响含水层的淡水晶状体。此外,地下水位测量显示了裂缝网络在地下水流中的作用。总体结果表明,在艾库玛尔地区可能存在的微盆地的条件,突显了局部裂缝的重要性,这可能随着尤卡坦半岛东海岸的地下水分流而发挥作用。并显示出溶解导管和裂缝带的存在,这些裂缝和裂缝带正在影响含水层的淡水晶状体。此外,地下水位测量显示了裂缝网络在地下水流中的作用。总体结果表明,在艾库玛尔地区可能存在的微盆地的条件,突显了局部裂缝的重要性,这可能随着尤卡坦半岛东海岸的地下水分流而发挥作用。

更新日期:2020-10-02
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