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    用镭同位素评价海水滞留时间及海底地下水排泄

    刘花台 郭占荣 袁晓婕 李开培 章斌

    刘花台, 郭占荣, 袁晓婕, 李开培, 章斌, 2013. 用镭同位素评价海水滞留时间及海底地下水排泄. 地球科学, 38(3): 599-606. doi: 10.3799/dqkx.2013.060
    引用本文: 刘花台, 郭占荣, 袁晓婕, 李开培, 章斌, 2013. 用镭同位素评价海水滞留时间及海底地下水排泄. 地球科学, 38(3): 599-606. doi: 10.3799/dqkx.2013.060
    LIU Hua-tai, GUO Zhan-rong, YUAN Xiao-jie, LI Kai-pei, ZHANG Bin, 2013. Utility of Radium Isotopes for Evaluating Residence Time and Submarine Groundwater Discharge. Earth Science, 38(3): 599-606. doi: 10.3799/dqkx.2013.060
    Citation: LIU Hua-tai, GUO Zhan-rong, YUAN Xiao-jie, LI Kai-pei, ZHANG Bin, 2013. Utility of Radium Isotopes for Evaluating Residence Time and Submarine Groundwater Discharge. Earth Science, 38(3): 599-606. doi: 10.3799/dqkx.2013.060

    用镭同位素评价海水滞留时间及海底地下水排泄

    doi: 10.3799/dqkx.2013.060
    基金项目: 

    国家自然科学基金项目 40672166

    国家自然科学基金项目 41072174

    详细信息
      作者简介:

      刘花台(1967-), 女, 副教授, 主要从事海岸带水文地质研究. E-mail: lht@xmu.edu.cn

    • 中图分类号: P641

    Utility of Radium Isotopes for Evaluating Residence Time and Submarine Groundwater Discharge

    • 摘要: 海底地下水排泄(submarine groundwater discharge, SGD)难以直接测量, 镭同位素和氡-222等天然示踪剂使得间接评价SGD通量成为可能.为了评价五缘湾的水体滞留时间和SGD通量, 实测了湾内海水、湾外海水和地下水中224Ra和226Ra的活度, 利用224Ra和226Ra半衰期的差异, 采用224Ra与226Ra的活度比值计算湾内水团的年龄和平均滞留时间, 利用224Ra和226Ra的质量平衡模型计算SGD通量.五缘湾13个站位的水团年龄在0.6~2.4 d之间, 湾顶水团年龄相对较大, 平均海水滞留时间1.4 d.地下水输入五缘湾的224Ra和226Ra通量分别为5.17×106 Bq/d和5.28×106 Bq/d, 将该通量用地下水端元的活度转换成为SGD通量分别是0.21 m3/m2/d(224Ra平衡模型)和0.23 m3/m2/d(226Ra平衡模型), 两种模型的结果较接近, 其平均值0.22 m3/m2/d可作为五缘湾的海底地下水排泄通量.

       

    • 图  1  五缘湾地理位置及取样点分布

      △.湾外海水样

      Fig.  1.  Sketch map of Wuyuan Bay and sampling stations

      图  2  224Ra和226Ra活度与盐度的线性关系

      Fig.  2.  The relation of 224Ra and 226Ra activities versus salinity

      图  3  湾内海水与湾外海水、地下水的224Ra与226Ra活度比值对比

      Fig.  3.  224Ra and 226Ra activities ratio in bay water compared with seawater outside bay and groundwater

      表  1  水样的224Ra、226Ra活度和盐度

      Table  1.   Measured 224Ra, 226Ra activity and salinity in the water samples

      水样 编号 224Ra(Bq/m3) 226Ra(Bq/m3) 盐度
      湾内海水 S1 4.13 4.71 26.2
      S2 3.73 4.06 26.2
      S3 3.47 3.77 27.1
      S4 3.31 3.65 29.3
      S5 4.17 3.76 26.9
      S6 2.29 2.77 29.0
      S7 3.26 2.95 28.2
      S8 2.06 2.37 30.3
      S9 2.78 2.54 30.6
      S10 2.63 2.29 30.8
      S11 2.16 2.53 30.5
      S12 2.32 2.05 30.5
      S13 2.60 2.25 30.7
      湾外海水 O1 1.37 1.48 31.0
      O2 1.45 1.68 30.9
      地下水 G1 14.27 6.21 0.4
      G2 10.82 13.46 0.5
      下载: 导出CSV
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    • 收稿日期:  2012-01-17
    • 刊出日期:  2013-05-15

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