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长江河口深层软土含盐特征及其沉积环境分析

苟富刚 龚绪龙 张岩 杨露梅 刘彦

苟富刚,龚绪龙,张岩,等. 长江河口深层软土含盐特征及其沉积环境分析[J]. 海洋学报,2022,44(4):12–22 doi: 10.12284/hyxb2022078
引用本文: 苟富刚,龚绪龙,张岩,等. 长江河口深层软土含盐特征及其沉积环境分析[J]. 海洋学报,2022,44(4):12–22 doi: 10.12284/hyxb2022078
Gou Fugang,Gong Xulong,Zhang Yan, et al. Salt characteristics and sedimentary environment analysis of deep soft soil in the Changjiang River Estuary[J]. Haiyang Xuebao,2022, 44(4):12–22 doi: 10.12284/hyxb2022078
Citation: Gou Fugang,Gong Xulong,Zhang Yan, et al. Salt characteristics and sedimentary environment analysis of deep soft soil in the Changjiang River Estuary[J]. Haiyang Xuebao,2022, 44(4):12–22 doi: 10.12284/hyxb2022078

长江河口深层软土含盐特征及其沉积环境分析

doi: 10.12284/hyxb2022078
基金项目: 中国地质调查局地质大调查项目(1212011220005);国家自然科学基金(41772327);江苏省自然资源厅项目(JSZRHYKJ202106)。
详细信息
    作者简介:

    苟富刚(1985-),男,陕西省渭南市人,高级工程师,主要从事环境地质方面的研究工作。E-mail: gfggfg@foxmail.com

  • 中图分类号: P641.3;P343.5

Salt characteristics and sedimentary environment analysis of deep soft soil in the Changjiang River Estuary

  • 摘要: 软土的含盐特征是地基设计的一个重要指标,含盐特征主要受沉积环境控制,往往具有较强的地域性。以长江河口北翼海陆交互相软土为研究对象,采集多组土样进行室内试验,进行土体含盐特征、参数相关性及沉积环境分析。研究结果表明,软土含盐特征为NaCl型,含盐量均值为0.613%,以弱盐渍土为主,占比85.4%。含盐量、Cl含量、Na+含量、K+含量峰度检验符合正态分布,但偏度检验值坐落在拒绝域,不属于正态分布。其他离子假设检验偏度和峰度检验均不符合正态分布。软土含盐量与Cl含量相关性最高,与除了Ca2+含量、${\rm{CO}}_3^{2-} $含量之外的离子相关性好。软土Cl含量与含盐量、${\rm{SO}}_4^{2-} $含量拟合以乘幂效果最佳;Cl含量与Na+、Ca2+、Mg2+、K+${\rm{HCO}}_3^- $含量拟合以多项式拟合效果最佳。软土环境沉积为碱性。软土钠吸附比平均值为54.35,与标准海水的钠吸附比接近,说明软土层含盐特征保留了海水特征。随着深度的增加,软土钠吸附比有减小的趋势,这与软土形成时间有关,软土形成时代越老,渗透淋滤的时间越长。软土中Sr/Ba远大于1,说明土体沉积时受到了海水作用。软土浸出液中的γMgCa远高于地表淡水的γMgCa背景值,说明土体沉积时受到海水入侵。引入海水混合模型,计算了海水混合比例。海水混合比的低值主要分布于西部远离海岸区,该区土体沉积主要受长江河水控制。海水混合比的高值主要分布在滨海地区,该区土体沉积主要受海侵控制,海相属性更重。
  • 图  1  研究区域及采样位置

    Fig.  1  Study area and sampling locations

    图  2  含盐量随深度变化特征

    Fig.  2  Characteristics of salt content change with depth

    图  3  盐分主要离子含量随深度变化特征

    Fig.  3  Variation characteristics of main salt ions content with depth

    图  4  软土含盐量分布

    Fig.  4  Distribution of salt content of soft soil

    图  5  氯离子与含盐量、各离子含量拟合关系

    Fig.  5  Fitting relationship between chloride ion and salt content and the content of each ion

    图  6  软土沉积曲线及海平面变化曲线(根据文献[29, 34]绘制)

    Fig.  6  Soft soil sedimentation curve and sea level change curve (drawing based on references [29, 34])

    图  7  沉积层序概化模型

    Fig.  7  A generalized model of sedimentary sequence

    图  8  软土含盐分区

    Fig.  8  Salt zoning of soft soil

    图  9  混合比随深度变化特征

    Fig.  9  Characteristics of mixing ratio variation with depth

    图  10  软土孔隙水、淡水及海水的三线图

    Fig.  10  Three-line diagram of soft soil pore water, fresh water and sea water

    图  11  ESR随深度变化特征

    Fig.  11  ESR variation characteristics with depth

    图  12  软土层含Sr和Ba特征(取自ZK1采样点)

    Fig.  12  Characteristics of Sr and Ba in soft soil (sampled from ZK1 sampling site)

    图  13  不同采样点γMg/γCa随深度变化特征

    Fig.  13  γMg/γCa variation characteristics with depth in different sampling sites

    表  1  软土含盐特征统计及概率分布表

    Tab.  1  Salt characteristics statistics and probability distribution of soft soil

    指标含盐量/%Na+含量/
    (mg·kg−1
    K+含量/
    (mg·kg−1
    Ca2+含量/
    (mg·kg−1
    Mg2+含量/
    (mg·kg−1
    ${{\rm{HCO}}_3^{-} } $含量/
    (mg·kg−1
    ${{\rm{CO}}_3^{2-} }$含量/
    (mg·kg−1
    ${{\rm{Cl}}^- } $含量/
    (mg·kg−1
    ${{\rm{SO}}_4^{2-}} $含量/
    (mg·kg−1
    pH$ {{\rm{Cl}}^- } $含量/2${{\rm{SO}}_4^{2-}} $
    含量
    最大值1.2264245.0151.0238.0238.0555.0118.06720.01760.09.5891.68
    最小值0.10481.04.66.32.697.01.0355.018.27.283.59
    平均值0.6132141.3577.6453.4153.23260.168.463256.05277.978.1521.35
    样品个数314314314314314314314314314314231
    变异系数0.370.390.410.670.670.301.280.400.700.040.61
    偏度0.04−0.060.192.411.601.135.710.022.280.372.05
    峰度0.430.310.747.323.932.0545.220.4610.901.846.17
    u10.320.471.3917.5911.678.2841.730.1216.682.7112.86
    u29.439.908.3116.093.533.46156.459.3229.324.2210.24
    正态检验拒绝拒绝拒绝拒绝拒绝拒绝拒绝拒绝拒绝拒绝拒绝
    下载: 导出CSV

    表  2  土体盐分指标相关性分析

    Tab.  2  Correlation analysis of soil salinity index

    指标含盐量Na+含量K+含量Ca2+含量Mg2+含量${{\rm{HCO}}_3^-} $含量${{\rm{CO}}_3^{2-}} $含量${{\rm{Cl}}^- }$含量${ {\rm{SO} }_4^{2-} }$含量pH
    含盐量1.0000.991**0.801**0.1100.696**0.164**−0.0630.993**0.564**0.033
    Na+含量0.991**1.0000.760**0.0170.612**0.167**−0.0310.986**0.499**0.054
    K+含量0.801**0.760**1.0000.195**0.655**0.120*−0.126*0.791**0.539**−0.018
    Ca2+含量0.1100.0170.195**1.0000.522**−0.045−0.276**0.116*0.172**−0.391**
    Mg2+含量0.696**0.612**0.655**0.522**1.000−0.123*−0.292**0.692**0.641**−0.170**
    ${ {\rm{HCO} }_3^-} $含量0.164**0.167**0.120*−0.045−0.123*1.0000.281**0.111*0.0650.117*
    ${ {\rm{CO} }_3^{2-} } $含量−0.063−0.031−0.126*−0.276**−0.292**0.281**1.000−0.088−0.0730.580**
    ${{\rm{Cl}}^- } $含量0.993**0.986**0.791**0.116*0.692**0.111*−0.0881.0000.485**0
    ${ {\rm{SO} }_4^{2-} } $含量0.564**0.499**0.539**0.172**0.641**0.065−0.0730.485**1.0000.182**
    pH0.0330.054−0.018−0.391**−0.170**0.117*0.580**00.182**1.000
      注:**表示在0.01水平(双侧)上显著相关;*表示在0.05水平(双侧)上显著相关。
    下载: 导出CSV
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  • 收稿日期:  2021-07-01
  • 修回日期:  2021-10-12
  • 刊出日期:  2022-04-14

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