Changes in surface soil mositure during freeze-thaw process under different vegetated status using Sentinel-1A in Beiluhe北大核心CSCD

Beiluhe basin lies in a permafrost region where is located in the interior of Tibetan Plateau. Ecosystem in the area is subjected to the freeze-thaw process of the active tjaele,and there is conspicuous correlation between soil moisture（SM）and vegetation coverage. To retrieve the soil moisture content of Beiluhe basin with a total area of 2 037. 94 km2,a synergistic method,which combined improved water cloud model,Oh,Dubois and Topp model,was presented in this paper base on Sentinel-1A multi-polarization SAR and Landsat-8 time series images data. The accuracy was validated with the in-situ point SM data：Adjusted-R2 of the regression equation is 0. 6848,and RMSE is 0. 039 cm3·cm-3. The analysis of correlation among freeze-thaw process,SM and vegetation cover from macro watershed scale manifests：Vegetation coverage has a significant delayed effect on the freeze-thaw process of the active tjaele,that is,the higher vegetation coverage,the more lagging freeze-thaw time;These study results are basically consistent with predecessors in-situ observation data,verifying the feasibility of studying correlation among soil freeze-thaw process,SM,and vegetation coverage from the macro watershed scale based on Sentinel-1A annual time series data. © 2022 Science Press (China).