地震水井水力學之理論模式改良與發展及同震水位資料分析

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题名:	地震水井水力學之理論模式改良與發展及同震水位資料分析
作者:	劉智偉;Chin-Wei Liu
贡献者:	地球物理研究所
关键词:	深度修正;地震-地下水;地震水井水力學;同震水位;depth independent;coseismic water level;seismic well hydraulics theories
日期:	2005-06-29
上传时间:	2009-09-22 09:55:11 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	921集集大地震引發之井中同震水位變化，促進了台灣地震-地下水的相關性研究。分析同震水位資料需要假設合宜且立論正確的地震水井水力學，然而現有之地震水井水力學尚有諸多限制與可改進之處，本研究首先將改良地震水井水力學理論模式，將薄壁效應納入考量，提高同震水位資料分析力與實用性。經參數敏感度分析發現，振幅比( )在高滲透性含水層中會有一峰值出現，且有效井深( )會影響峰值出現之週期，但較不受到含水層儲蓄係數( )及薄壁效應( )之影響。在低滲透性含水層中，值小於1且呈單向增加函數，顯示有縮小效應，不受之影響，但受到及的影響甚大。現有之地震水井水力學皆假設為已知定值，但考慮不同情況會有不同的定義，較無代表性的物理意義，且諸多的文獻中皆指出應視為未知的參數，可用來調整理論曲線使其符合現場資料分析，又實際分析資料顯示調整可是理論曲線更吻合現場資料，因為建議將視為未知可調之參數。由於在高滲透性含水層中不受的影響，因此可發展類穩態之地震水井水力學理論模式，使高滲透性含水層中的同震水位分析更簡單。除此之外，在中央大學地下水研究井場之同震水位觀測井中發現，同震水壓之震盪頻率相當高(高於2 Hz)，因此觀測同震水位需使用高測頻之量測儀器。又在不同深度會有不同之同震水壓反應，而理論模式皆為對井水位面作為分析，故使用壓力計量測同震水位時，最好放置於原始水位面下0.5公尺以內，避免深度之影響。經分析低滲透性含水層之同震水位資料所得之結果與理論相符，顯示低滲透性含水層中之同震水位對於地震造成含水層中壓力頭的震盪振幅確實會有縮小效應。 The coseismic water level changes induced by the Chichi earthquake promoted the research of relationship between earthquake and groundwater. To analyze coseismic water level data must have correct seismic well hydraulics theories, but existing theories have a few limits and unreasonable conditions. The first purpose is to improve the current seismic well hydraulics theories and take into account the skin effect ( ). In high permeability aquifer, the effective column height ( ) changes the period that pick of magnification ratio occurs, but have not influence by and . In low permeability aquifer, the magnification ratio affected by Sk, but have not influence by . Present seismic well hydraulics theories assume that is known and can be calculated, but definition is different at different conditions considered. Many documents also indicate that is unknown and can be adjusted to field data. In practical application, regulate can make the theory curve match the field data. Therefore we suggest that when using seismic well hydraulics theory, take be a unknown parameter. Because in high permeability aquifer the coseismic water level changes have not influence by , analyze coseismic water level data can use quasi-static state seismic well hydraulics theory that it make the analysis more simple. Field data indicates that the frequency of variation is larger than 2Hz. So observe the coseismic water level change must use transducer with high sampling rate. Besides, it also indicates that seismic well water pressure variation increases with well water depth. Therefore when observe coseismic water level change using pressure transducer, it must put within 5m below water level. Analyze the field data in low permeability aquifer shows that it is match the theory curve, and indicates that the variation in the well is small than in the aquifer.
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