Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (6): 1706-1713.doi: 10.13278/j.cnki.jjuese.20190051

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Comprehensive Method (TEcG) of Determination of the Location of Freshwater and Saltwater Interface and Its Application

Shu Longcang1, Wang Mingzhao1, Zhang Huitong2, Zhang Hanming2, Zhang Naipeng2, Sun Ying2, Sun Chao2, Yuan Pengjie2   

  1. 1. College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China;
    2. Dongying Bureau of Hydrology, Dongying 257099, Shandong, China
  • Received:2019-03-20 Published:2019-11-30
  • Supported by:
    Supported by National Natural Science Foundation of China (41572210)

Abstract: Accurate determination of the location of freshwater and saltwater interface is the premise of evaluation of saltwater intrusion. Hydrochemical analysis method and geophysical investigation method are the main methods to determine the location of freshwater and saltwater interface. In order to overcome the huge waste of human, material and financial resources caused by using only one traditional method, take the saltwater intrusion area south of Xiaoqing River in Guangrao County, southwestern coast of Laizhou Bay as the research object. Based on comprehensive analysis of the current situation of groundwater exploitation and the results of hydrochemical monitoring in the area, three typical sections were selected, and field electrical conductivity method in hydrochemical method was used to rapidly determine the approximate location of the freshwater and saltwater interface. Then, high-density resistivity method was used to rapidly and accurately determine the spatial distribution of freshwater and saltwater interface between saltwater and freshwater monitoring wells. Results show that if the electrical conductivity of underground water in this area is greater than 1.61 mS/cm, it can be considered that the area is intruded by saltwater. The apparent resistivity of the freshwater and saltwater interface is 11-13 Ω·m. The saltwater body near the freshwater and saltwater interface is tongue-shaped and mainly occurs in shallow groundwater within 13 m below the surface.

Key words: freshwater and saltwater interface, electrical conductivity method, correlation of electrical conductivity and chlorine ion, high-density resistivity method

CLC Number: 

  • X83
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