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浙闽沿岸泥质区沉积物粒度组分对长江入海输沙量减少的响应

刘胜璟 高建华 徐笑梅 石勇 舒卓 吴昊 元冰瑜 贾建军

刘胜璟,高建华,徐笑梅,等. 浙闽沿岸泥质区沉积物粒度组分对长江入海输沙量减少的响应[J]. 海洋学报,2021,43(3):105–115 doi: 10.12284/hyxb2021025
引用本文: 刘胜璟,高建华,徐笑梅,等. 浙闽沿岸泥质区沉积物粒度组分对长江入海输沙量减少的响应[J]. 海洋学报,2021,43(3):105–115 doi: 10.12284/hyxb2021025
Liu Shengjing,Gao Jianhua,Xu Xiaomei, et al. Response of sediment grain size composition of the Zhe-Min coastal mud to the sediment load reduction of the Changjiang River entering the sea[J]. Haiyang Xuebao,2021, 43(3):105–115 doi: 10.12284/hyxb2021025
Citation: Liu Shengjing,Gao Jianhua,Xu Xiaomei, et al. Response of sediment grain size composition of the Zhe-Min coastal mud to the sediment load reduction of the Changjiang River entering the sea[J]. Haiyang Xuebao,2021, 43(3):105–115 doi: 10.12284/hyxb2021025

浙闽沿岸泥质区沉积物粒度组分对长江入海输沙量减少的响应

doi: 10.12284/hyxb2021025
基金项目: 国家自然科学基金(41776048,41876092)
详细信息
    作者简介:

    刘胜璟(1995-),男,江苏省连云港市人,研究方向为海洋沉积学。E-mail:shjing_liu@163.com

    通讯作者:

    高建华(1973-),教授,主要从事海洋沉积动力学研究。E-mail:jhgao@nju.edu.cn

  • 中图分类号: P736.2

Response of sediment grain size composition of the Zhe-Min coastal mud to the sediment load reduction of the Changjiang River entering the sea

  • 摘要: 自1950年以来,长江入海输沙量呈阶段性减少趋势;作为长江远端泥,长江入海输沙量的“减沙”效应在浙闽沿岸泥质区是否有相应的沉积信号?若有,该如何进行提取和解译?为探讨以上问题,在浙闽沿岸泥质区采集柱状样5根,进行了高分辨率(2 mm)的粒度测试,并通过端元分析手段分离出4个端元。结合研究区物源及水动力的空间差异,发现各端元有其特定的指示意义:EM1组分(众数粒径约为2 μm)为长江来源的极细粒物质;EM2组分(众数粒径约为10 μm)主要为长江及浙闽沿岸中小河流的细颗粒物质,但以长江为主;EM3组分(众数粒径约为80 μm)主要为台湾暖流带来的较粗粒物质;EM4组分(众数粒径约为200 μm)为长江输运的粗颗粒物质。进一步分析发现,EM1组分对长江入海输沙量的阶段性减少有较好的响应关系:由浙闽泥质区北部至南部响应强度依次降低;在响应时间上存在滞后现象,且从北到南滞后时间增加,由北部的4~6年增加至南部的10~14年。总体来看,细颗粒组分更能反映长江流域变化信息,且泥质区的不同位置对流域变化信息的响应强度差异显著。
  • 图  1  研究区流系及采样点分布图(★为采样位置)

    改绘自文献[23-24];a:浙闽沿岸流;b:台湾暖流;c:黑潮;d:黑潮入侵分支;e:台湾物质可能的影响区域

    Fig.  1  Current systems and sampling distribution of the study area (★ represents the sampling position)

    Modified from references [23-24]; a: Zhe-Min Coastal Current; b: Taiwan Warm Current; c: Kuroshio; d: the branch of Kuroshio intrusion; e: possible area of impact of Taiwanese material

    图  2  各柱状样平均粒径垂向变化

    Fig.  2  The mean grain size of each sample column

    图  3  各柱状样210Pb活度的垂向分布

    Fig.  3   Vertical distributions of 210Pb radioactivity in each sediment core

    图  4  各端元频率分布

    Fig.  4  Frequency distribution of each end member

    图  5  各柱状样不同端元含量

    Fig.  5  Different end member content in each sediment core

    图  6  长江入海输沙量与EM1组分的变化关系

    Fig.  6  The relationship between EM1 composition and the reduction of sediment entering into the sea from the Changjiang River

    表  1  柱状样信息

    Tab.  1  The information of sample columns

    柱状样编号纬度经度水深/m长度/cm
    S129.55°N122.80°E5838
    S228.47°N122.58°E6543
    S327.63°N121.90°E6536
    S426.82°N121.23°E6541
    S526.18°N120.15°E2846
    下载: 导出CSV

    表  2  端元拟合结果

    Tab.  2  The results of end member unmixing

    No. of EMSEM R2R2Theta
    21.742×10−60.9569.650
    39.311×10−30.9796.723
    40.02050.9963.044
    50.1820.9981.896
    60.1080.9991.342
      注:No. of EMS为拟合端元数量;EM R2为所有拟合端元之间线性平方相关性的最大值;R2为测量数据集和拟合的端元数据集之间的线性平方相关性;Theta为测量数据集和拟合端元数据集之间的角度距离。
    下载: 导出CSV
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  • 收稿日期:  2019-12-09
  • 修回日期:  2020-01-27
  • 网络出版日期:  2021-02-25
  • 刊出日期:  2021-04-23

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