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地下水井水位及化学组分的同震差异响应特征分析

顾鸿宇 王东辉 李胜伟 郑万模 刘港 向元英 李丹 陈能德

顾鸿宇, 王东辉, 李胜伟, 郑万模, 刘港, 向元英, 李丹, 陈能德. 地下水井水位及化学组分的同震差异响应特征分析[J]. 水文地质工程地质, 2021, 48(6): 44-53. doi: 10.16030/j.cnki.issn.1000-3665.202104019
引用本文: 顾鸿宇, 王东辉, 李胜伟, 郑万模, 刘港, 向元英, 李丹, 陈能德. 地下水井水位及化学组分的同震差异响应特征分析[J]. 水文地质工程地质, 2021, 48(6): 44-53. doi: 10.16030/j.cnki.issn.1000-3665.202104019
GU Hongyu, WANG Donghui, LI Shengwei, ZHENG Wanmo, LIU Gang, XIANG Yuanying, LI Dan, CHEN Nengde. An analysis of the coseismic differential response characteristics of well water levels and chemical components : A case study triggered by the Qingbaijiang earthquake[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 44-53. doi: 10.16030/j.cnki.issn.1000-3665.202104019
Citation: GU Hongyu, WANG Donghui, LI Shengwei, ZHENG Wanmo, LIU Gang, XIANG Yuanying, LI Dan, CHEN Nengde. An analysis of the coseismic differential response characteristics of well water levels and chemical components : A case study triggered by the Qingbaijiang earthquake[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 44-53. doi: 10.16030/j.cnki.issn.1000-3665.202104019

地下水井水位及化学组分的同震差异响应特征分析

doi: 10.16030/j.cnki.issn.1000-3665.202104019
基金项目: 国家自然科学基金项目(41907174);中国地质调查局地质调查项目(DD20189210;DD20211402;DD20211381)
详细信息
    作者简介:

    顾鸿宇(1991-),男,博士,工程师,地下水及地质灾害监测。E-mail:1083471408@qq.com

    通讯作者:

    王东辉(1982-),男,硕士,教授级高级工程师,从事水工环、城市地质调查相关工作。E-mail:16216813@qq.com

  • 中图分类号: P641.3

An analysis of the coseismic differential response characteristics of well water levels and chemical components : A case study triggered by the Qingbaijiang earthquake

  • 摘要: 相邻监测井的同震差异响应分析是研究地下水同震响应机理的路径之一。2020年2月3号青白江地震引发了龙泉山地下水监测井水位及水质的异常变化。利用多种水化学组分及水位的自动监测数据分析了相邻两口监测井的同震差异响应特征,讨论了水化学组分及水位差异响应机理。在相同能量密度情况下,ZK1水位变幅较ZK6大,表明ZK1对本次地震响应的敏感性高于ZK6。地震主要引起了处于还原环境(Eh<0)的第二含水层(主要离子为${\rm{NH}}_4^+ $${\rm{NO}}_3^- $)中地下水向ZK1的排泄,而处于氧化环境(Eh>0)的第一含水层(高浓度Cl,高TDS及pH)中地下水主要向ZK6排泄。不同含水层水体向井排泄和混合是造成两口井地下水化学组分差异响应的原因。根据震后井水位及水化学组分的趋势变化规律分析,岩体在地震作用下的不排水体积改变是造成地下水水位阶跃变化的主要原因,ZK1周围第二含水层发生了塑性变形,渗透性发生了永久改变,而ZK6周围岩体发生弹性变形,渗透性未发生永久改变。
  • 图  1  研究区构造地质概况

    Figure  1.  Tectonic geology in the study area

    图  2  研究区水文地质剖面图

    Figure  2.  Hydrogeological profile of the study area

    图  3  监测井位置

    Figure  3.  Location of two monitoring wells

    图  4  钻孔ZK1、ZK7岩性柱状图及含水层位置

    Figure  4.  Lithologic log of wells ZK1 and ZK6 and the depth of two identified aquifers

    图  5  监测井及仪器设备

    Figure  5.  Photo of the monitoring well and equipment

    图  6  ZK1地下水各类参数对青白江地震的响应特征

    Figure  6.  Coseismic characteristics of groundwater parameters in ZK1 to the Qingbaijiang earthquake

    图  7  ZK6地下水各类参数对青白江地震的响应特征

    Figure  7.  Coseismic characteristics of groundwater parameters in ZK6 to the Qingbaijiang earthquake

    图  8  青白江地震在监测井位置的能量密度(修改自文献[14])

    Figure  8.  Seismic energy at the monitoring wells triggered by the Qingbaijiang earthquake(modified from Ref. [14])

    图  9  大气压力时频谱图

    Figure  9.  Magnitude Scalogram of the atmospheric pressure

    图  10  ZK1和ZK6同震地下水响应概念模型

    Figure  10.  Schematic diagrams showing the coseismic differential response of groundwater in wells ZK1 and ZK6

    表  1  ZK1和ZK6水位及水化学参数同震变化表

    Table  1.   Coseismic response of water levels and chemical components in ZK1and ZK6

    井号阶段水位埋深/mCl/(mg·L−1${\rm{NH}}_4^+ $/(mg·L−1${\rm{NO}}_3^- $/(mg·L−1pHEh/mVTDS/(mg·L−1温度/℃
    ZK1震前12.362280////1435.5/
    震后11.562084////1384.9/
    ZK6震前13.4335750.1/7.274811888.7/
    震后13.1843271.4/7.354042247.3/
      注:“/”表示震前及震后无明显异常。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-15
  • 修回日期:  2021-06-17
  • 网络出版日期:  2021-10-25
  • 刊出日期:  2021-11-15

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