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首页> 外文期刊>Progress in Earth and Planetary Science >Identification of hydrogeological evolution using hydrogeology-seismology analysis of groundwater head fluctuation related to the 1999 M W = 7.5 Chi-Chi earthquake
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Identification of hydrogeological evolution using hydrogeology-seismology analysis of groundwater head fluctuation related to the 1999 M W = 7.5 Chi-Chi earthquake

机译：使用水文地震转力鉴定水文地震速度与1999 m w = 7.5

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At 1:47?a.m. on September 21, 1999, the M_(w)7.5 Chi-Chi earthquake struck Taiwan. The purpose of this study is to (1) apply multiple spatiotemporal-frequency analysis to filter the post-seismic change in groundwater head to explore the implicit drawdown associated with excess pore-water pressure release and effective stress relief during post-seismic evolution and (2) establish a stochastic experimental optimization model for identifying the hydrogeological evolution. The approaches used for post-seismic drawdown filtration include multi-rank principal components decomposition, multi-frequent wavelet transforms decomposition, and multi-level wavelet de-noising. This study especially evaluates the following advanced post-seismic evolving parameters: (1) harmonic average leaking/injecting rate, (2) distance between the acting position and monitoring well, (3) storage coefficient under effective stress relief and formation compression, and (4) transmissivity for excess-pore-water pressure release. This study applies the integrated methodology on 179 monitoring wells in the Chou-Shui River alluvial fan. Results show that the overlying principal components PCs and low-level wavelet de-noising can filter additional sources/sinks, in which the extracted drawdown from PC1+PC3 was related to the excess pore-water pressure relaxation process, that from PC2+PC5+PC6+PC7 and high-frequency wavelet de-noised detail cD _(2)related to the earth tidal fluctuation effect, and that from PC4+PC9 and cD _(3)related to the barometric effect. According to the Riemann integral and an objective function value duration curve, calculated occurrence probability from the stochastic optimization for SC2, the storage coefficient was reduced from pre-seismic pumping test value 0.00107, post-seismic 27th hour evolving value 0.000826 to post-seismic pumping test value 0.000578 in 2004, and the transmissivity increased from pre-seismic test value 92.4?m~(2)/h, post-seismic 27th hour evolving value 98.6?m~(2)/h to post-seismic test value 147.6?m~(2)/h. The results demonstrate that the SC2 and GH3 zones suffer from crustal compression and the permeability was increased to dissipate excess pore-water pressure and effective stress.
机译：在1：47？上午。 1999年9月21日，M_（W）7.5奇智地震袭击了台湾。本研究的目的是（1）施加多个时空频率分析，以过滤地下水头后地震变化，探讨与后孔隙水压力释放和在后地震后进化期间有效应力释放相关的隐式缩减（ 2）建立一种用于识别水文地质演化的随机实验优化模型。用于后地震绘制过滤的方法包括多级主组件分解，多频率变换分解，多级小波脱模。本研究特别是评估以下先进的后地震演化参数：（1）谐波平均泄漏/注射率，（2）作用位置与监测井之间的距离，（3）在有效的应力缓解和形成压缩下的储存系数，和（ 4）过量孔隙水压力释放的透射率。本研究适用于围水河冲积扇中179井的综合方法。结果表明，覆盖的主成分PC和低电平小波​​去噪可以过滤额外的源/水槽，其中来自PC1 + PC3的提取的拔线与PC2 + PC5 +的过​​量的孔隙水压松弛过程有关。 PC6 + PC7和高频小波脱发细节CD _（2）与地球潮汐波动效果相关，从PC4 + PC9和CD _（3）与气压效应相关。根据RIEMANN积分和目标函数值持续时间曲线，计算出从SC2的随机优化的发生概率，从预震泵测试值0.00107降低了储存系数，后地震第27小时进化值0.000826到后地震泵送2004年测试值0.000578，透射率从地震检测值92.4〜（2）/ h，后地震后第27小时进化值98.6？m〜（2）/ h后地震检测值147.6？ m〜（2）/ h。结果表明，SC2和GH3区遭受地壳压缩，增加渗透率以消散过量的孔隙水压和有效应力。

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