咸淡水界面位置确定的综合方法(TEcG)及其应用

doi:10.13278/j.cnki.jjuese.20190051

Abstract

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:

Shu Longcang, Wang Mingzhao, Zhang Huitong, Zhang Hanming, Zhang Naipeng, Sun Ying, Sun Chao, Yuan Pengjie. Comprehensive Method (TEcG) of Determination of the Location of Freshwater and Saltwater Interface and Its Application[J].Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1706-1713.

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

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