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| Discussion on Monitoring the Subsidence of Subgrade in Permafrost Region With Satellite D-InSAR Technology |
| TAN Qu-lin, WEI Qing-chao, YANG Song-lin |
| Beijing Jiaotong University, Beijing 100044, China |
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Abstract Research purposes：It is very important to monitor the subsidence of subgrade in permafrost region because the permafrost is unstable , but it is difficult to monitor the subsidence of the subgrade in permafrost region using the current ground measuring device due to the extremely bad environmental conditions. The satellite differential interferometric synthetic aperture radar technology(D-InSAR) is an innovative measurement method developed rapidly in recent years. This approach can cover and measure a region of hundreds of square kilometers without on-site fieldwork. The subsidence information of point, profile and surface can be acquired and analyzed using this method. In the paper, the necessity, feasibility and significance of monitoring the subsidence o f subgrade in permafrost region using satellite D-InSAR technology are discussed.
Research conclusions：Under extremely difficult natural geographic condition, using the satellite D-InSAR technology to monitor the subsidence of the subgrade in permafrost region is essential to improve the working condition, enhancing the monitoring efficiency, reducing the monitoring cost and manualm on itoring work in difficult area as much as possible and to the construction of the long-term monitoring system for the infrastructure in permafrost region. Using the unique, continuous subsidence information of point, profile and surface obtained from the satellite D-InSAR can analyze the spatial characteristics and regulation of the subgrade deformation in permafrost region from the angles o f points, profiles and surface in the wide range and can help obtain the new discovery or new know ledge about subgrade subsidence in permafrost region through the analysis from the spatial angle. These can provide the new basis for evaluation of the stability of the subgrade in permafrost region and open the new thought on further researching the engineering deformation in permafrost region.
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Received: 21 October 2009
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2010, Vol. 27 
