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

摘要/Abstract

摘要： 准确确定咸淡水界面位置是评价咸水入侵范围的前提。对于咸淡水界面位置的确定，传统研究以水化学法和物探法为主。为克服单一使用传统方法造成的人力、物力和财力的大量浪费，以莱州湾西南岸广饶县小清河以南咸水入侵区为研究对象，在综合分析研究区地下水开采现状、水化学监测结果的基础上，选择3个典型断面，采用水化学法中的野外现场电导率法，快速判断咸淡水界面大致位置（某两眼监测井之间）；再在一咸一淡的两眼监测井之间，采用高密度电阻率法快速、准确地确定咸淡水界面的空间分布。结果表明：该地区的地下水电导率若大于1.61 mS/cm，即可认为此处受到咸水入侵；咸淡水界面位置的视电阻率特征值为11~13 Ω·m，咸淡水界面附近咸水体呈舌状入侵并主要发生在地表以下13 m内的浅层地下水中。

关键词: 咸淡水界面, 电导率法, 电导率与氯离子关系, 高密度电阻率法

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

中图分类号:

束龙仓, 王明昭, 张惠潼, 张含明, 张乃鹏, 孙影, 孙超, 袁鹏杰. 咸淡水界面位置确定的综合方法(TEcG)及其应用[J]. 吉林大学学报(地球科学版), 2019, 49(6): 1706-1713.

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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