Changes in hydrogeological properties of the River Choushui alluvial fan aquifer due to the 1999 Chi-Chi earthquake, Taiwan |
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| Authors: | Cheng-Shin Jang Chen-Wuing Liu Yeeping Chia Li-Hsin Cheng You-Ching Chen |
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| Institution: | (1) Department of Leisure and Recreation Management, Kainan University, Luzhu, Taoyuan, Taiwan, 33857, Republic of China;(2) Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan, 10617, Republic of China;(3) Department of Geosciences, National Taiwan University, Taipei, Taiwan, 10617, Republic of China;(4) Department of Occupational Safety and Hygiene, Fooyin University, Kaohsiung Hsien, 831, Taiwan, Republic of China |
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| Abstract: | 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. |
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| Keywords: | Taiwan Earthquake Pumping test Transmissivity Storage coefficient |
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