Survey and Study on Exploring the Interface of Saltwater Intrusion by Using the EH4 Electromagnetic Imaging System in Laizhou Bay Area
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摘要: 利用EH4电磁成像系统在莱州湾地区探测了海水入侵界限,结果表明,EH4电磁成像视电阻率反演断面图不仅能反映地下咸淡水水体层位垂向的厚度变化、横向上延伸情况,建立各层位的相互关系,还可以反映层位的埋深及起伏形态,而且根据该断面图勾划出来的咸淡水分界线与水文地质调查结果基本吻合,说明这种方法在该地区有效而可行。EH4电磁成像系统对探测海水入侵具有简单,快速等特点,应用前景很好,值得推广。Abstract: Through the analysis of the application cases by using the EH4 electromagnetic imaging system to ex-plore seawater intrusion in Laizhou bay area, we found that apparent resistivity inversion section of the EH4 elec-tromagnetic imaging system contains a large amount of geological information,inversion section reflects not only the strata thickness variation of the vertical and horizontal extension on saltwater and freshwater, and establishes the relationships of every strata, but also the burial depth of stratum and the strata of ups and downs.We use the cross section of apparent resistivity to identify boundary of salt water and freshwater. The result of saltwater and freshwater interface with the inversion section of the EH4 electromagnetic imaging system is almost consistent with the result of hydrogeological survey, and this method is effective and feasible in Laizhou bay area. The appli-cation of the EH4 electromagnetic imaging system in the exploration of seawater intrusion has the advantages of simple, fast and so on, it has very good prospects and worth spreading and popularizing.
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