Modified Time Reversal Application to Ground Penetrating Radar (GPR) for Detection of Kariz (Ancient Aqueduct) Galleries
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کد مقاله : 2120-NIGS
نویسندگان
1موسسه ژئوفیزیک دانشگاه تهران
2پژوهشگر
3Department of Computer Science and Information Technology, La Trobe University, Melbourne, Australia,
4رئیس بخش پژوهشی موسسه ژئوفیزیک دانشگاه تهران
چکیده
Ground penetrating radar (GPR) data interpretation that is quantitative typically yields information on the characteristics of subterranean geological structures and the depth of sources. But any geophysical technique, including GPR, always has some drawbacks. Here, we offer a comparison of the depth determined from GPR signals using various techniques at three Kariz (old aqueduct) sites, namely, two active sites (now transporting water) and one dried site, both of which are in the Iranian city of Kashan. In the case of the Kariz investigations, the outcomes are based on recently established or widely used approaches for application in GPR signal processing, such as the standard processing strategy, the compensated wavelet transform (CWT), time reversal (TR) imaging and combination of CWT and TR that forms a recent processing approach, herein-after referred to as modified TR (MTR). While traditional processing and CWT frequently failed to define a clear target, the estimated depth from TR and MTR are extremely close to the drilling depth and have demonstrated a satisfactory comparison with the drilling depth. The results of TR and MTR thus show that both methods can be expanded to other similar applications, such as the detection of subsurface holes, and are also relevant to GPR signals for the estimation of depth to Kariz galleries.
کلیدواژه ها
Title
Modified Time Reversal Application to Ground Penetrating Radar (GPR) for Detection of Kariz (Ancient Aqueduct) Galleries
Authors
Sajjad Ghanbari, maksim Bano, Ala Ebrahimi, Mohammad Kazem Hafizi
Abstract
Ground penetrating radar (GPR) data interpretation that is quantitative typically yields information on the characteristics of subterranean geological structures and the depth of sources. But any geophysical technique, including GPR, always has some drawbacks. Here, we offer a comparison of the depth determined from GPR signals using various techniques at three Kariz (old aqueduct) sites, namely, two active sites (now transporting water) and one dried site, both of which are in the Iranian city of Kashan. In the case of the Kariz investigations, the outcomes are based on recently established or widely used approaches for application in GPR signal processing, such as the standard processing strategy, the compensated wavelet transform (CWT), time reversal (TR) imaging and combination of CWT and TR that forms a recent processing approach, herein-after referred to as modified TR (MTR). While traditional processing and CWT frequently failed to define a clear target, the estimated depth from TR and MTR are extremely close to the drilling depth and have demonstrated a satisfactory comparison with the drilling depth. The results of TR and MTR thus show that both methods can be expanded to other similar applications, such as the detection of subsurface holes, and are also relevant to GPR signals for the estimation of depth to Kariz galleries.
Keywords
Keywords: Ancient Aqueduct, GPR, MTR, Time Reversal Imaging