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Evaluation of Hydraulic Properties of Aquitards Using Earthquake-Triggered Groundwater Variation

机译：利用地震触发的地下水变化评估阿基塔尔的水力特性

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摘要

The hydraulic properties of aquitards are not easily obtained because monitoring wells are usually installed in aquifers for groundwater resources management. Earthquake-induced crust stress (strain) triggers groundwater level variations over a short period of time in a large area. These groundwater anomalies can be used to investigate aquifer systems. This study uses a poroelastic model to fit the postseismic variations of groundwater level triggered by the Chi-Chi earthquake to evaluate the hydraulic properties of aquitards in the Jhoushuei River alluvial fan (JRAF), Taiwan. Six of the adopted eight wells with depths of 70 to 130m showed good agreement with the recovery theory. The mean hydraulic conductivities (K) of the aquifers for the eight wells are 1.62x10(-4) to 9.06x10(-4) m/s, and the thicknesses are 18.8 to 46.1m. The thicknesses of the aquitards are 11.3 to 42.0m. Under the isotropic assumption for K, the estimated values of K for the aquitards are 3.0x10(-8) to 2.1x10(-6) m/s, corresponding to a silty medium. The results match the values obtained for the geological material of the drilling core and those reported in previous studies. The estimated values were combined with those given in previous studies to determine the distribution of K in the first two aquitards in the JRAF. The distribution patterns of the aquitards reflect the sedimentary environments and fit the geological material. The proposed technique can be used to evaluate the K value of aquitards using inverse methods. The inversion results can be used in hydrogeological analyses, contaminant modeling, and subsidence evaluation.
机译：由于通常将监测井安装在含水层中以管理地下水资源，因此不易获得阿奎德的水力特性。地震引起的地壳应力（应变）在大面积的短时间内触发了地下水位的变化。这些地下水异常可用于调查含水层系统。这项研究使用孔隙弹性模型来拟合由Chi-Chi地震引发的地下水位的地震后变化，以评估台湾周水河冲积扇（JRAF）中的水母的水力特性。在八口深度为70至130m的井中，有六口井与采收率理论吻合良好。八个井的含水层的平均水力传导率（K）为1.62x10（-4）至9.06x10（-4）m / s，厚度为18.8至46.1m。乳汁的厚度为11.3至42.0m。在K的各向同性假设下，无水玻璃的K估计值为3.0x10（-8）至2.1x10（-6）m / s，对应于粉质介质。结果与钻芯地质材料的值和先前研究中报道的值相匹配。将估计值与先前研究中给出的值相结合，以确定JRAF中前两个two鱼中K的分布。水母的分布方式反映了沉积环境并适合地质材料。所提出的技术可用于通过逆方法评估a鱼的K值。反演结果可用于水文地质分析，污染物建模和沉降评估。

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  • 来源
    《Ground water》 |2017年第5期|747-756|共10页
  • 作者

    Wang Shih-Jung; Hsu Kuo-Chin; Wang Chein-Lee; Lai Wen-Chi; Hsu Liang-Tzu;

  • 作者单位

    Sinotech Engn Consultants Inc, Geotech Engn Res Ctr, 9F,260 Zhongshan 2nd Rd, Kaohsiung 806, Taiwan;

    Natl Cheng Kung Univ, Dept Resources Engn, 1 Univ Rd, Tainan 701, Taiwan;

    Natl Cheng Kung Univ, Dept Resources Engn, 1 Univ Rd, Tainan 701, Taiwan;

    Natl Cheng Kung Univ, Disaster Prevent Res Ctr, 1 Univ Rd, Tainan 701, Taiwan;

    Taiwan Power Co, Dept Nucl Generat, Civil Engn Sect, 242,Sect 3,Roosevelt Rd, Taipei, Taiwan;

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