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<p>Freshwater aquifers on offshore islands are an invaluable resource that directly affects the islands’ economic and social life. Seawater migration into aquifers on islands is a frequent phenomenon that significantly affects the quality and quantity of fresh water in the aquifers. Our research combines electro-geophysical and geochemical methods and has been used effectively to study saltwater intrusion in coastal aquifers. This article presents the results of 16 lines of electrical resistivity tomography (ERT) and 21 physicochemical water samples at the available wells conducted on Coto Island in Quang Ninh province, Vietnam. The obtained interpretation of these data provides new insights into the geological structure, the distribution of aquifers, and the salinity intrusion potential of pore and fissure aquifers in the Coto Island area. The measurement results of 16 ERT lines have determined the thickness and resistivity of the Quaternary pore aquifer and the Ordovic—Siluan fissure aquifer. Resistivity values determined in aquifers closely correlate with EC and TDS measurements of water samples from available wells. The results have determined that the fractured aquifer in the southern area of Dong Tien commune is heavily salinized from two sides. It is confirmed that the northern region of Dong Tien commune has a fissure aquifer with great potential for supplying fresh water for the residents on the island.</p>

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Mapping freshwater and seawater intrusion using electrical resistivity tomography and physicochemical data: an application in Coto Island, Gulf of Tonkin

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Nguyen Nhu Trung,
  • Đặng Xuân Phong,
  • Trịnh Hoài Thu,
  • Bui Văn Nam,
  • Nguyễn Văn Điệp

摘要

Freshwater aquifers on offshore islands are an invaluable resource that directly affects the islands’ economic and social life. Seawater migration into aquifers on islands is a frequent phenomenon that significantly affects the quality and quantity of fresh water in the aquifers. Our research combines electro-geophysical and geochemical methods and has been used effectively to study saltwater intrusion in coastal aquifers. This article presents the results of 16 lines of electrical resistivity tomography (ERT) and 21 physicochemical water samples at the available wells conducted on Coto Island in Quang Ninh province, Vietnam. The obtained interpretation of these data provides new insights into the geological structure, the distribution of aquifers, and the salinity intrusion potential of pore and fissure aquifers in the Coto Island area. The measurement results of 16 ERT lines have determined the thickness and resistivity of the Quaternary pore aquifer and the Ordovic—Siluan fissure aquifer. Resistivity values determined in aquifers closely correlate with EC and TDS measurements of water samples from available wells. The results have determined that the fractured aquifer in the southern area of Dong Tien commune is heavily salinized from two sides. It is confirmed that the northern region of Dong Tien commune has a fissure aquifer with great potential for supplying fresh water for the residents on the island.