云南曲靖井水位潮汐动态特征分析
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摘要
以井-含水层系统潮汐理论为基础,结合云南曲靖井水位观测资料实际情况,利用Baytap-G提供的潮汐分析方法,分别计算了曲靖井水位M2、S2、O1、S1K1和M3共5个潮汐分波的振幅比、相位和计算误差,分析了井水位观测资料不同潮汐波振幅比和相位的动态变化特征,认为能反映含水层参数的井水位潮汐振幅比和相位变化与附近的抽水和远距离大震引起的同震响应有关,具体表现为,2001年11月和2003年8月的振幅比和相位下降变化可能与抽水有关,而几次大震后的井水位潮汐振幅比和相位小幅度上升和缓慢恢复过程,则可能与中远场大震的地震波动力引起的含水层渗透系数增加有关.
Based on tidal theory of well-aquifer system and combined with the actual observation situation of water level in Qujing well,Yunnan province,the tidal amplitude ratios,phases and calculation error of 5 tidal waves for M2,S2,O1,S1K1 and M3 were calculated separately with the method provided by Baytap-G.After analyzing the dynamic characteristics of amplitude ratios and phases for different water level tidal waves,we suggest that the tidal amplitude ratios and phases,which can reflect aquifer parameters,are correlated with the near pumping and coseismic response caused by distant great earthquake.Specifically,the decrease of amplitude ratios and phases in November 2001 and August 2003 may be related to pumping.Several times of small-amplitude rise and slow recovery process of well water level tide amplitudes and phases after large earthquakes may be related to the increasing of aquifer permeability induced by the passage of seismic waves from far large earthquakes.
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