M.Sc Tezi Görüntüleme

       GPR is a near surface geophysical technique that is used for evaluating the location and depth of buried objects and to investigate the presence and continuity of natural subsurface conditions and features. GPR is similiar in principle to reflection seismic method. Its noninvasive capabilities make GPR an attractive alternative to the tradational methods used for subsurface characterization. In this method, high frequency electromagnetic waves are used.

      In this study, it was performed to assess GPR response for imaging of the near subsurface. On five different study areas, GPR was used to resolve for many different problems. On the field studies, reflection profiling method was applied by using a RAMAC/GPR system with 25 MHz unshielded antenna. Case studies have been conducted to show how GPR data can be used for determining shallow subsurface geology, locating void and man-made features, using mining works and investigating landslide areas. Various data processing methods have been performed GPR cross sections obtained from different area works and parameters of the every method have been analyzed

      GPR profiles have been demonstrated to detect natural or man-made subsurface features, map the bedrock, investigate rupture surface of landslides and image geology of the near surface. RAMAC/GPR with 25 MHz unshilded antenna has approximately imaged penetration depths of 30 meters. It is realized that way of getting data affects GPR cross-section (e.g. drift from direction of the profile, holding high level of the antennas from ground). It comes to the conclusion that higher frequency antennas is needed for obtaining higher resolution. GPR cross sections provided on area studies are affected by steps of the data processing. It is seen that the choose of the parameters used in data processing has been significiant. It is proposed that combining the use of two or more geophysical methods and geological information will provide better results and help in understanding the complex nature of subsurface.