Forward modeling on the seasonal frozen soil region detection by ground penetrating radar
Er-Qiao SONG1,2, Si-Xin LIU1,2(), Rong-Qin HE1,2, Jia-Qi CAI3, Kun LUO1,2
1. College of Geo-exploration Science & Technology, Jilin University, Changchun 130026, China; 2. Key Lab of Applied Geophysics, Ministry of Land and Resources, Changchun 130026, China 3. Taizhou Design Institute of Water Conservancy & Hydro-electric Power, Taizhou 318000, China;
With the change of season, the physical parameters in the process of freezing and thawing in active layer of seasonal frozen soil region change significantly. Taking the seasonal frozen soil in Northeast China as an example, the authors used the Gaussian distribution rough surfaces to simulate the rough freezing and melting layers, established the random media model which can accurately described heterogeneity of the active layers, and carried out forward modeling. The results show that the depth of freezing and melting layers changes with the seasons, together with the change of permittivity and conductivity. The scattered waves in radar profile are very developed because of the heterogeneous active layer and the undulating freezing and melting layers. With the change of time, the greater the fluctuation of the melting layer, the stronger the scattered wave energy in the radar profile, the harder the reflection of the melting and the freezing layers. At the same time, it is proved that the application of GPR to monitor the seasonal variation, frozen depth and melting depth of seasonal frozen soil is a practical method.
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