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首页> 外文期刊>Hydrogeology journal >Changes in hydrogeological properties of the River Choushui alluvial fan aquifer due to the 1999 Chi-Chi earthquake, Taiwan
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Changes in hydrogeological properties of the River Choushui alluvial fan aquifer due to the 1999 Chi-Chi earthquake, Taiwan

机译：台湾1999年集集地震造成的潮水冲积扇型含水层水文地质特性变化

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摘要

Changes in hydrogeological properties of the River Choushui alluvial fan aquifer before and after the 1999 Chi-Chi earthquake, Taiwan, have been identified using pumping tests. Three wells, SH2, YL2 and SC2, located in a compressional zone with high coseismic groundwater levels, were tested. The threshold of the aquifer deformation with respect to transmissivity (T) is greater than that with respect to storage coefficient (S). Decreases in the post-earthquake S are approximately 60% at SH2 and SC2, indicating aquifer compression after the Chi-Chi earthquake. Changes in the post-earthquake T range from 61% increase to 0.8% decrease. Moreover, results from anisotropy analysis of T at SC2 further illustrate that normal stresses induced by the Chi-Chi earthquake have consolidated soil particles. Soil particles dilated laterally after the earthquake, resulting in an increase of the equivalent T. The changes in hydrogeological properties have a considerable influence on spatiotemporal fluid pressure and horizontal groundwater movement, resulting in different amounts of drawdown during post-earthquake pumping.
机译：利用抽水试验已经确定了1999年台湾集集地震前后的潮水冲积扇扇含水层的水文地质特性变化。测试了位于同震地下水位高的压缩带中的三口井SH2，YL2和SC2。相对于透射率（T）的含水层变形的阈值大于相对于储能系数（S）的含水层变形的阈值。 SH2和SC2地震后S的下降约60％，表明在Chi-Chi地震后含水层受压。地震后T的变化范围从61％上升到0.8％下降。此外，SC2处T的各向异性分析结果进一步表明，由Chi-Chi地震引起的正应力已经固结了土壤颗粒。地震后土壤颗粒横向膨胀，导致等效T增大。水文地质特性的变化对时空流体压力和水平地下水运动有相当大的影响，从而在地震后抽水过程中产生了不同的回撤量。

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