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咸淡水混合对珊瑚砂渗透性影响的试验研究

李英豪 韩冬梅 曹天正 赵孝伟 宋献方 蔡砥柱

李英豪, 韩冬梅, 曹天正, 赵孝伟, 宋献方, 蔡砥柱. 咸淡水混合对珊瑚砂渗透性影响的试验研究[J]. 地质科技通报, 2023, 42(4): 194-200. doi: 10.19509/j.cnki.dzkq.tb20220048
引用本文: 李英豪, 韩冬梅, 曹天正, 赵孝伟, 宋献方, 蔡砥柱. 咸淡水混合对珊瑚砂渗透性影响的试验研究[J]. 地质科技通报, 2023, 42(4): 194-200. doi: 10.19509/j.cnki.dzkq.tb20220048
Li Yinghao, Han Dongmei, Cao Tianzheng, Zhao Xiaowei, Song Xianfang, Cai Dizhu. Experimental study on the effect of subsurface freshwater-saltwater mixing on the permeability of coral sand[J]. Bulletin of Geological Science and Technology, 2023, 42(4): 194-200. doi: 10.19509/j.cnki.dzkq.tb20220048
Citation: Li Yinghao, Han Dongmei, Cao Tianzheng, Zhao Xiaowei, Song Xianfang, Cai Dizhu. Experimental study on the effect of subsurface freshwater-saltwater mixing on the permeability of coral sand[J]. Bulletin of Geological Science and Technology, 2023, 42(4): 194-200. doi: 10.19509/j.cnki.dzkq.tb20220048

咸淡水混合对珊瑚砂渗透性影响的试验研究

doi: 10.19509/j.cnki.dzkq.tb20220048
基金项目: 

国家自然科学基金项目 42277066

中国科学院战略性先导科技专项项目 XDA13010303

中国地质调查局自然资源综合调查指挥中心地质调查专项项目 ZD20220606

详细信息
    作者简介:

    李英豪(1995—), 男, 现正攻读自然地理专业硕士学位, 主要从事水文水资源研究工作。E-mail: liyinghao1211@163.com

    通讯作者:

    韩冬梅(1978—), 女, 研究员, 主要从事滨海地下水水文过程和海水入侵研究工作。E-mail: handm@igsnrr.ac.cn

  • 中图分类号: P641

Experimental study on the effect of subsurface freshwater-saltwater mixing on the permeability of coral sand

  • 摘要:

    珊瑚砂渗透性是决定岛礁地下淡水储量的关键因素, 长期以来缺乏岛礁地下淡水形成过程中不同盐度溶滤液对珊瑚砂渗透性影响的分析研究。在实验室条件下利用3种盐度不同的溶液模拟淡水、过渡带水和海水, 分别对珊瑚砂进行了溶蚀和渗透试验, 分析了滤出液在溶蚀过程中的离子浓度变化以及珊瑚砂渗透系数的变化特征, 并基于X射线衍射分析和PHREEQC反向模拟, 探讨了珊瑚砂在不同盐度溶液中发生的主要水岩相互作用以及渗透性变化的可能原因。结果表明, 珊瑚砂渗透特性与砂体发生的溶蚀作用强弱有关, 一般来说, 溶滤液盐度越高, 溶蚀作用越强烈, 溶滤后砂体渗透系数增大。在纯水中, 珊瑚砂受溶蚀程度较小, 溶蚀前后渗透系数几乎不变; 在咸水中, 珊瑚砂发生了碳酸盐岩溶解和以Na+-Ca2+为主的离子交换作用等水岩作用, 且随盐度升高作用越强烈, 渗透系数越大。经过NaCl浓度为0.2, 0.4 mol/L的溶液溶蚀360 h后, 砂体渗透系数由0.58 m/d增加为0.64, 0.74 m/d, 推断溶蚀作用通过改变砂体整体孔隙度, 从而增加渗透系数。研究结果可为准确评估岛礁淡水资源储量及保障水资源可持续发展提供科学参考。

     

  • 图 1  砂样的颗粒级配曲线

    Figure 1.  Grain size curves of coral sand

    图 2  试验装置示意图

    1.砂柱; 2.广口瓶; 3.蠕动泵; 4.导管; 5.止水夹; 6.定水头供水瓶; 7.烧杯

    Figure 2.  Schematic diagram of the test device

    图 3  滤出液离子质量浓度动态变化特征

    R1.去离子水; R2.ρ(NaCl)为0.2 mol/L的溶液;R3.ρ(NaCl)为0.4 mol/L的溶液。其中,Na+, Cl-质量浓度为稀释后质量浓度,在R1、R2、R3三种溶液体系下分别稀释了10,100,100倍

    Figure 3.  Dynamic change characteristics of ions in different solutions during the test

    图 4  砂样X射线衍射测试分析结果

    Figure 4.  Sand sample X-ray test results

    图 5  砂样溶蚀前后的渗透系数变化

    Figure 5.  Change in the permeability coefficient of coral sand

    表  1  珊瑚砂溶蚀过程中所发生的主要反应

    Table  1.   Main reactions that occur during the dissolution of coral sand

    水化学反应 化学反应式
    石膏溶解 CaSO4·2H2O→Ca2++SO42-+2H2O
    方解石溶解 CaCO3+CO2+H2O→Ca2++2HCO3-
    白云石溶解 CaMg(CO3)2+2CO2+2H2O→Ca2++Mg2++4HCO3-
    离子交换 2Na++CaX(s)→2NaX(s)+Ca2+
    Ca2++2KX(s)→CaX(s)+2K+
    Ca2++2NaX(s)→CaX(s)+2Na+
    盐岩溶解 NaCl→Na++Cl-
    下载: 导出CSV

    表  2  模拟路径上可能反应相的交换量

    Table  2.   Exchange volume of possible reactive phases along the simulated path

    方解石/10-3 mol 石膏/10-4 mol 白云石/10-3 mol 盐岩/10-2 mol CO2/10-3 g NaX/10-3 mol CaX2/104 mol KX/10-4 mol
    W1 -1.08 11.6 1.58 1.16 1.97 1.0 -6.55 3.07
    W2 18.30 6.78 1.99 -4.95 19.7 36.9 -188 6.76
    W3 22.50 12.8 2.13 -9.78 22.5 47.0 -237 3.81
    注:负值代表沉淀,正值代表溶解
    下载: 导出CSV

    表  3  全新世珊瑚砂渗透系数的测定方法及其范围

    Table  3.   Previous research on the permeability coefficient of Holocene coral sand

    序号 研究区 测定方法 渗透系数范围/(m·d-1) 来源
    1 西沙某岛礁 室内常水头渗透试验 57.9~609.9 文献[33]
    2 某人工灰沙岛 现场双环渗透试验 1.0~52.0 文献[18]
    3 南海人工岛 室内常水头渗透试验 0.1~0.9 文献[25]
    4 西沙永兴岛 常水头渗透试验 70.0 文献[34]
    5 南海某人工岛 常水头渗透试验 58.6~176.9 文献[19]
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-02-09
  • 录用日期:  2022-09-13
  • 修回日期:  2022-08-30

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