由井水位的固体潮效应反演汶川地震导致的含水层参数变化
首发时间:2013-09-09
摘要:研究表明,固体潮能够引起地下水位动态变化,而水位变化特征与含水层参数、井孔结构等有关,因此利用井水位的固体潮效应可以反演含水层参数。国内外的很多学者对此进行了研究,并取得了一定的成果。本文借鉴前人关于井水位固体潮与含水层参数关系方面的研究方法和成果,提取三峡井网中的七口地震地下水观测井(大河口、丁家坪、高家溪、郭家坝、韩家湾、茅坪及屈家湾)井水位中的固体潮信号,研究固体潮参数在2008年汶川"5.12"地震前后的变化,以此为基础分析汶川地震导致的含水层参数的变化。结果发现汶川地震均造成了该地区井-含水层系统导水系数的增大。而且,利用潮汐效应计算的结果与抽水试验所得结果具有较好的一致性。
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Inversion of the aquifer parameter changes caused by the Wenchuan earthquake in ways of earth tide effect of well water level
Abstract:Researches show that the earth tides can cause dynamic changes of groundwater level, and the characteristic of the groundwater level is related to the parameters of aquifers, the structure of wells, etc. Therefore, the tidal effect of water level could be used to identify the aquifer parameters. A number of national and international scholars have done many researches on this problem and have made some achievements. This paper referring others' work based on the research methods and results of the relationship between tidal effect and the aquifer parameters, extracts the signal of earth tides from seven earthquake observation wells in the three-Gorges well network, studies the changes of tidal parameters before and after the 2008 Wenchuan "5.12"earthquake, and then analyzes the changes of the aquifer parameters caused by Wenchuan earthquake. Results show that the Wenchuan earthquake led to an increase in the transmissibility of the local well-aquifer system, moreover, the results computed by the tidal effect has preferable consistency with pumping test results.
Keywords: earth tide effect aquifer parameters earthquake phase lag Three Gorge region
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