| The topography is dominated by plateaus and mountains in southwest China,and this area develops intensive structure activities.With extreme climatic conditions and artificial mining,which leads to the frequently occurrence of geological disasters such as landslides and avalanches.The destruction of the landslide has seriously affected the construction of national economy,jeopardized the safety of people's life and property.However,the methods of the conventional landslide investigation,monitoring and landslide prediction can waste time and energy and be difficult to monitor the lagre area,and cannot be continuous real-time monitoring.Interferometric synthetic aperture radar technology with the capabilities of high precision,large range,all-weather,all-time and high resolution can be for a long period of time of landslide hazard point tracking monitoring and can discover new landslide points.It can feedback monitoring results in time.More importantly,it provides a new method for earthquake monitoring in southwest China.In this paper,we used ALOS-2 and RADARSAT-2 data to monitor the landslide in Zunyi,Tongren,Bijie and Guiyang of Guizhou province by DInSAR.And we selected the recorded and unrecorded hidden danger points for analyzing combined with field investigation.Meanwhile,we used the 11 SAR images acquired by ALOS-2 satellites to extract the interference target points and analysis the landslide area of the 550 transmission line of Sichuan Jinsu line in Zhaotong city,Yunnan province by IPTA.And the AISAR system is developed for the landslide monitoring data process.Finally,the main research work and conclusions are as follows:(1)Compared with the technique of multi-temporal InSAR,DInSAR has benefited from the short revisit period of the satellite so that it can quickly monitor the landslide displacement in the larger space,and find the geological hazard points which not included in the landslide list.It provides a new technical means for investigating and monitoring of the geological hazard points in the vulnerable landslide area of southwest China.(2)DInSAR can effectively detect the landslide displacement,and find the geological hazard points which are not included in the landslide list(Yinjia village,Xiaobazi village),at the same time a successful warning the geological disaster in Shiping village,Dafang county.The points listed in the landslide list can be timely timely follow-up monitored(Shiping village).The area where the landslide has occurred should be continuous monitored(Zongling town of Nayong county),and we can control of the landslide area whether causes the slip in the future.(3)The long time series automatic interferometry processing system(AISAR)is developed by Python based on parallel multithreaded processing technology,it can be able to quickly process and analysis the massive SAR data of landslide monitoring.Meanwihle it support for various types of sensors data.(4)The IPTA technology can be also obtained better results when the SAR data are relatively small,and it is suitable for the southwest region with dense vegetation in China.We use this technique to find an obvious landslide point in Xintan town of suijiang county,Zhaotong city,Yunnan province.Between August 21,2016 and August 20,2017,the average deformation was 6.06cm.According to analyze the landslide area and the field verification,it is concluded that the region ground deformation rate of the annual average for-18.1?12mm/year,if the deformation of the landslide point continue to happen,the 47 tower of the transmission line of Sichuan-Jinsu 550 line near the area will be in great hazard. |
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