| Popis: |
Over the past 100 years, the process of global climate change has accelerated, and the air temperature has also appeared an increasing trend in the high latitude permafrost area of northeast of China, the permafrost degradation which dramatically changed the environmental geological conditions,resulting in the change of landform and the increase of geological disasters.However, there are few research results about this area. In this paper, we take the road area of Bei'an-Heihe highway crossing the Lesser Khingan Mountain as the study area. Using a total of 18 ALOS/PALSARSAR images, through the SBAS-InSAR technique to draw the surface deformation map of the study area from July 2007 to December 2010, combined with the local meteorological data and the permafrost distribution map in the study area obtained by our research group, the relationship between distribution characteristics of permafrost, permafrost degradation, and surface deformation were analyzed. The results show that the annual average deformation rate of surface in the study area is ± 70 mm/year, the surface deformation is closely related to the permafrost distribution, and the distribution law is consistent.Climate warming is the main factor leading to the permafrost degradation. In the context of continued warming and accelerating degradation of permafrost, we will face landslides, ground surface subsidence or more ecological and engineering problems, threaten the safety of local engineering structures. The results reveal the law of the permafrost degradation process under the background of climate warming, and provide a reference for future research. |
