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地学领域高质量科技期刊分级T2区（2023）

世界期刊影响力指数报告Q1区（2023）

Volume 42 Issue 4
Jul.  2023
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Article Navigation >  Bulletin of Geological Science and Technology  > 2023  >  42(4): 194-200
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
shu

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

doi: 10.19509/j.cnki.dzkq.tb20220048
  • 1.

    Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100049, China

  • 2.

    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    China Institute of Water Resources and Hydropower Research, Beijing 100038, China

  • 4.

    Haikou Marine Geological Survey Center, China Geological Survey, Haikou 570100, China

  • Received Date: 09 Feb 2022
  • Accepted Date: 13 Sep 2022
  • Rev Recd Date: 30 Aug 2022
    Abstract
  • Objective

    The permeability of coral sand is the key factor determining the groundwater reserves of coral islands. For a long time, the research on the influence of different salinity filtrates on the permeability of coral sand during the formation of freshwater lenses is quiet few.

    Methods

    In this study, three kinds of solutions with different salinities were designed to represent freshwater, transition zone water and seawater to conduct dissolution and permeation tests on coral sand. Based on X-ray diffraction analysis and PHREEQC reverse simulation, the possible causes of water-rock interactions and permeability changes in coral sand in different salinity solutions were discussed.

    Results

    Results showed that the permeability of coral sand was highly related to its dissolution in water bodies. The higher the salinity of the solution, the stronger the dissolution and the greater the permeability coefficient of the coral sand. The permeability coefficient of coral sand was almost unchanged in pure water. In saltwater, coral sand has undergone water-rock interactions, including carbonate dissolution and Na+-Ca2+ ion exchange, and the water-rock interaction is stronger with increasing salinity. After 360 hours of reaction under NaCl solutions with concentrations of 0.2 mol/L and 0.4 mol/L, the coral sand permeability coefficient changed from 0.58 m/d to 0.64 m/d and 0.74 m/d, respectively. It was inferred that dissolution could increase the overall porosity and thus the permeability coefficient by changing the sand particle size.

    Conclusion

    The results provide a scientific reference for the accurate assessment of freshwater reserves and the sustainable development of water resources on coral islands.

     

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