The survey on paleochannels is of great value for it can help to understand former culture and geography. As a method equipped with high resolution, ground penetrating radar (GPR) has been widely used in archaeological exploration. However, conventional processed profile can only provide limited information like the shape or location of the interface, but can't give the distribution of physical properties which could help identify a paleochannel. A way for GPR to map parameter distributions is the common-midpoint velocity analysis, but it can only provide limited resolution. In this paper, we put forward a new scheme to obtain a more accurate image of the paleochannel and its surrounding medium. The scheme mainly involves the impedance inversion of conventional common-offset GPR data, which uses well log to compensate GPR data and finally gives a high-resolution estimation of permittivity. To test this method, we did a case study at Mudu city site in Suzhou, China. The inversion result provides a clear image of the channel of the ancient city's moat. It is shown that this method is effective and feasible for detection of paleochannels.
Presentation Date: Monday, September 25, 2017
Start Time: 2:15 PM
Location: 360C
Presentation Type: ORAL
