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Application of electrical resistivity tomography for imaging seawater intrusion in a coastal aquifer
Acta Geophysica ( IF 2.0 ) Pub Date : 2021-01-21 , DOI: 10.1007/s11600-020-00529-7
Bogdan Mihai Niculescu , Gina Andrei

Following previous geoelectrical researches initiated in 2009 for the delineation and characterization of seawater intrusion in a freshwater aquifer of Sarmatian (late Middle Miocene) age, a subsurface imaging survey via 2-D electrical resistivity tomography (ERT) was conducted in 2019 on the outskirts of Vama Veche resort—Romanian Black Sea southern coast. The survey was organized in the framework of a field camp sponsored by the Foundation of the Society of Exploration Geophysicists (SEG)–Tulsa, OK, USA, with participation of teams from the University of Bucharest—Department of Geophysics and the Geological Institute of Romania. A number of eight ERT profiles with N–S, W–E, NNE–SSW, and WNW–ESE orientation and 155–315 m length were imaged with a SuperSting R8/IP instrument (Advanced Geosciences Inc.), using deployments of 32–64 electrodes at 5 m spacing, in Wenner, Schlumberger, and dipole–dipole array configurations. The processing and interpretation of high-resolution ERT data indicated that the seawater intrusion, evidenced as very low resistivity (5–10 Ω m) anomalous zones starting at approximately 45–49 m depth, has advanced at least 500 m inland. The survey results also allowed the identification of a system of fractures or faults with an approximate NW–SE/WNW–ESE and, possibly, N–S orientation, that might have provided potential pathways for saline water intrusion.



中文翻译:

电阻层析成像在沿海含水层海水入侵成像中的应用

继2009年开始进行划定和表征Sarmatian(中中新世晚期)淡水含水层中海水入侵的地电研究之后,2019年通过二维电阻层析成像(ERT)进行了地下成像调查Vama Veche度假村-罗马尼亚黑海南部海岸。这项调查是在美国俄克拉荷马州塔尔萨市勘探地球物理学家协会(SEG)基金会赞助的野外训练营框架内组织的,来自布加勒斯特大学地球物理系和罗马尼亚地质研究所的研究小组参加。使用SuperSting R8 / IP仪器(Advanced Geosciences Inc.)拍摄了8个ERT剖面,它们具有N–S,W–E,NNE–SSW和WNW–ESE方向,长度为155–315 m ),在Wenner,Schlumberger和偶极-偶极阵列配置中,以5 m的间距部署32-64个电极。对高分辨率ERT数据的处理和解释表明,海水入侵(已证明是始于大约45-49 m深度的极低电阻率(5-10Ωm)异常区)已经向内陆推进了至少500 m。调查结果还可以识别出具有近似NW–SE / WNW–ESE以及可能为N–S方向的裂缝或断层系统,这可能为盐水入侵提供了可能的途径。

更新日期:2021-01-21
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