Mahmut Göktuğ Drahor

A shallow aquifer system was investigated with 2D electrical resistivity tomography (ERT) to determine the hydrogeological setting of the Balıklı Lake region, Şanlıurfa, Turkey. Many spring waters are found in the study area where groundwater flow paths merge and reach the surface. A recreation complex was planned near the Balıklı Lake by the Municipality of Şanlıurfa. Therefore, an ERT survey was carried out to reveal the subsurface characterization, particularly to investigate the possible shallow aquifer system beneath the recreation area. Consequently, 2D resistivity data along thirteen profiles were acquired in the study area and the data were inverted by a tomographic inversion technique. The conductive layers in the ERT results indicated a shallow aquifer zone probably related to a karstic environment. The high conductivity observed in this layer might be caused by pollution resulting from the industrial and domestic wastes of the residential areas. The high resistive bottom layer was considered to be the basement in the study area. The geometry of the shallow aquifer environment was confirmed by slicing maps obtained from the ERT data. To build the conceptual geological model, a 2D forward resistivity modelling study was also achieved after the inversion studies. The inversion parameters and borehole result underlie the background of the forward model. Field and synthetic data were compared to each other and tested in means of calculation of the misfits to determine the reliability of these models.

The integrated use of geophysical methods has developed rapidly in the last fifteen years in archaeological prospection (Brizzolari et al., 1992; Gaffney et al., 2004; Drahor, 2006; Casana et al., 2008). The combined application of different geophysical techniques supplies useful information about buried archaeological contexts, particularly höyük(tell, tepe)-type archaeological settlements. The aim of such studies is to help archaeologists conduct fast, effective and economical excavations b...

In this study, the optimum electrical resistivity tomography (OERT) concept was analyzed by combining different electrode arrays in terms of sensitivity in archaeological cases. More than a hundred electrode arrays were classified by Szalai & Szarka (2008), investigating the superposition, focusing and linearity problem. Also, Dahlin & Zhou (2004) compared images resulting from various configurations. However, the difficulties posed by apparent resistivity due to different characteristics of ...

Magnetic and electrical resistivity tomography (ERT) surveys were carried out in the area of a Roman military installation located near the Zeugma archaeological site in southeastern Turkey. Magnetic gradiometer surveys were performed in the northern part of this area and covered 8.52 ha; measurements were obtained using a FM‐36 fluxgate gradiometer on a 0.5 × 1 m grid. The visualized data revealed the general orientation of the Roman military settlement, which appeared as regular structures in the magnetic images. In addition, ERT surveys were performed in some areas that had shown regular magnetic anomalies. Resistivity data were interpreted using the robust inversion algorithm in two‐dimensional and three‐dimensional forms. Resistivity tomography studies showed that the archaeological structures lay close to the surface. There was considerable agreement between the results of the magnetic and ERT survey methods. Trial trenches were excavated in promising areas to test the geophysical results. A range of distinctive elements of military settlement, such as walls, pipes, roads, foundations and also metallic objects (a large assemblage of Roman military helmets and armour) were discovered during the excavations. Copyright © 2008 John Wiley & Sons, Ltd.