Investigating the structure of a coastal karstic aquifer through the hydrogeological characterization of springs using geophysical methods and field investigation, gökova bay, sw turkey

Date

2020-12-01

Author

Sağır, Çağdaş
Kurtuluş, Bedri
Soupios, Pantelis
Ayrancı, Korhan
Düztaş, Erkan
Aksoy, Murat Ersen
Avşar, Özgür
Erdem, Günseli
Pekkan, Emrah
Canoğlu, Mustafa Can
Kaka, Sanlinn I.
Razack, Moumtaz

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The electrical resistivity tomography method has been widely used in geophysics for many purposes such as determining geological structures, water movement, saltwater intrusion, and tectonic regime modeling. Karstic springs are important for water basin management since the karst systems are highly complex and vulnerable to exploitation and contamination. An accurate geophysical model of the subsurface is needed to reveal the spring structure. In this study, several karst springs in the Gökova Bay (SW, Turkey) were investigated to create a 3D subsurface model of the nearby karstic cavities utilizing electrical resistivity measurements. For this approach, 2D resistivity profiles were acquired and interpreted. Stratigraphically, colluvium, conglomerate, and dolomitic-limestone units were located in the field. The resistivity values of these formations were determined considering both the literature and field survey. Then, 2D profiles were interpolated to create a 3D resistivity model of the study area. Medium-large sized cavities were identified as well as their locations relative to the springs. The measured resistivities were also correlated with the corresponding geological units. The results were then used to construct a 3D model that aids to reveal the cavity geometry in the subsurface. Additionally, several faults are detected and their effect on the cavities is interpreted.

Subject Keywords

3D imaging, Electrical resistivity tomography, Induced polarization, Karstic aquifer

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85097281461&origin=inward
https://hdl.handle.net/11511/105064

Collections

Department of Geological Engineering, Article