Speaker: Feng Xuan

Affiliation: Jilin University

Academic title: Professor

Abstract:

The fractures with fluid flow will lead to the damage of rock carvings relics and the detection of millimeter-scale fractures is a challenge in the relic preservation. This study proposes a new method to detect millimeter-scale fracture with fluid flow using full-polarimetric ground penetrating radar(FP-GPR). The target decomposition methods are adopted to analyze the data. In the numerical test, we adopt the hydrological modeling to build realistic dielectric models for FP-GPR simulations, and the results determine the variation consistencies between water contents and Ps, Pd, and α. Finally, two field tests are performed at the experimental station of the Dazu Rock Carvings in Chongqing, China. Case I is an experiment on a surface fracture of a cliff whereas case II is a detection test of a buried fracture. The results verify the effectiveness of the proposed method.

Biography:

Xuan Feng is a professor and deputy dean of college of Geo-exploration science and technology in Jilin University. He was the postdoctoral of Tohoku University, and visiting scientist of MIT. His research interesting is GPR and exploration seismology. Currently, he is the PI of NSFC project and national key research and development Program of China. He published paper in IEEE TGRS, GRL, JGR Solid Earth, GJI, Geophysics etc. He is IEEE senior member and awarded the title of "new century excellent talents" by the Ministry of education and awarded the title of "outstanding young scientific and technological talents of land and resources" by the Ministry of land and resources.