SEISMOLOGY AND GEOLOGY ›› 2023, Vol. 45 ›› Issue (3): 652-667.DOI: 10.3969/j.issn.0253-4967.2023.03.004

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HYDROLOGICAL PROPERTIES ESTIMATION BY WATER LEVEL IN RESPONSE TO BAROMETRIC PRESSURE

LIU Wei1)(), BAI Xi-min2), LÜ Shao-jie1), SHI Zhe-ming1),*(), QI Zhi-yu1), HE Guan-ru1)   

  1. 1) China University of Geosciences, Beijing, Key Laboratory of Groundwater Protection, Ministry of Water Resources, Beijing 100083, China
    2) Nanchang Key Laboratory of Hydrogeology and High Quality Groundwater Resources Exploitation and Utilization, Jiangxi Institute Co., Ltd. of Survey and Design, Nanchang 330000, China
  • Received:2022-11-07 Revised:2023-03-15 Online:2023-06-20 Published:2023-07-18

基于井水位气压效应计算含水层的水力参数

刘伟1)(), 白细民2), 吕少杰1), 史浙明1),*(), 齐之钰1), 何冠儒1)   

  1. 1) 中国地质大学(北京), 地下水保护水利部重点实验室, 北京 100083
    2) 江西省勘察设计研究院有限公司, 南昌市水文地质与优质地下水资源开发利用重点实验室, 南昌 330000
  • 通讯作者: * 史浙明, 男, 1988年生, 教授, 主要从事地下水方面的研究, E-mail: szm@cugb.edu.cn
  • 作者简介:

    刘伟, 男, 1998年生, 现为中国地质大学(北京)地质学专业在读硕士研究生, 主要从事地下水对气压和固体潮的响应研究, E-mail:

  • 基金资助:
    国家自然科学基金(41972251); 南昌市水文地质与优质地下水资源开发利用重点实验室项目

Abstract:

Groundwater, as one of the most active components of the earth's crust, has a sensitive reflection to crustal stress as well as solid deformation. Previous studies have shown that fluctuations in barometric pressure cause corresponding dynamic changes in well water level, and the response of well water level to barometric pressure signal can reveal a lot of hydrogeological information such as groundwater movement law and aquifer water storage mechanism, and can also provide a new way to estimate the hydraulic parameters of the aquifer. The method of using well water level in response to barometric pressure to estimate the hydraulic parameters is in-situ, low cost, and low disturbance, which has certain advantages compared with traditional field hydrogeological tests.
We analyze the water level and barometric pressure data of the monitoring wells in the fault zone, and the change characteristics of the permeability of the fault zone can be obtained. The seismicity of the Qujiang fault is strong, and studying its permeability and evolution characteristics plays an important role in understanding the seismicity in this area. Therefore, in this study, we took the Gaoda well in the Qujiang fault zone in Yunnan Province as the object of study, and collected minute level data of well water level and barometric pressure from February 2019 to July 2020, based on the response of the well water level to the barometric pressure signal in different periods to calculate the hydraulic parameters of the aquifer using barometric response function and analyzed the change characteristics of the permeability of the fault zone after the earthquake. At the same time, compared and analyzed the parameter estimation results with the results calculated by previous methods using well water level in response to earth tide and slug test. The results show that:
(1)The aquifer permeability of the Gaoda well ranges from 8.89×10-15 to 11.10×10-15m2 and the transmissivity ranges from 2.44×10-6 to 3.05×10-6m2/s during different observation periods, and the overall variation is not significant and fluctuates within a certain range, indicating the aquifer permeability of the Gaoda well did not change significantly after the earthquake, and the permeability of the Qujiang fault zone was relatively stable. Meanwhile, previous studies on the tidal analysis of the Jiangchuan well near the southern section of the Xiaojiang fault zone, which is 16.6km away from Tonghai, showed that the permeability of its aquifer did not change significantly after the Tonghai 5.0 earthquake in 2018, indicating that the permeability of the southern section of the Xiaojiang fault zone and the Qujiang fault zone are relatively stable, and the hydraulic characteristics of the two have a certain similarity, and the comparison result between the two wells is referential to some extent.
(2)The hydraulic parameters of the aquifer calculated based on the response of well water level to the barometric pressure are somewhat different from those calculated by previous authors using earth tide responses and slug tests, and the obtained parameters are slightly lower than those obtained by earth tide responses and slug tests, this may be due to the different factors considered by different methods and the different degrees of fracture development in the part of the fault zone where the well is located, resulting in a certain degree of heterogeneity in the aquifer, causing differences in the results obtained by different methods, which reflect the differences in the spatial scales, the applicability of the models, and the parameter range represented by the aquifer hydraulic parameters inferred by the response models of different well-aquifer systems. In addition, the barometric pressure signal acts in a wider frequency band, more parameters are inferred by the model, and its response can be recorded under different hydrogeological conditions, making the response model to barometric pressure more widely applicable.

Key words: well water level, barometric pressure response, parameter estimation, Gaoda well in Yunnan Province

摘要:

研究井水位对气压信号的响应可揭示地下水运动规律、 含水层储水机制等众多水文地质信息, 也可为求解含水层的水力参数提供新的途径。相较于传统野外水文地质试验, 利用井水位气压响应求解参数的方法具有原位、 低成本、 低扰动的优势。文中以位于曲江断裂带的高大井为研究对象, 基于不同时间段内井水位对气压信号的响应, 计算了含水层的水力参数。结果表明: 不同观测时段内高大井所在含水层的渗透率为8.89×10-15~11.10×10-15m2, 导水系数为2.44×10-6~3.05×10-6m2/s, 总体变化不大, 说明地震后高大井含水层的渗透性并未发生显著改变, 曲江断裂带的渗透性相对比较稳定。利用气压响应方法计算的结果与前人利用固体潮响应和微水试验计算所得结果存在一定差异, 反映了利用不同井-含水层系统的响应模型反演的含水层水力参数所代表的空间尺度、 模型的适用性及参数范围的差异性。由于气压信号作用的频段更宽, 模型反演的参数更多, 且在不同水文地质条件下均能记录其响应, 使得气压响应模型的适用性更为广泛。

关键词: 井水位, 气压响应, 参数估计, 云南高大井