Monitoring The Surface Deformation Of Coastal Urban Region With InSAR And GNSS

In recent years,geological disasters caused by construction activities have increasingly threatened people 's personal and property safety.However,the traditional monitoring methods represented by total station deformation monitoring and GNSS deformation monitoring are difficult to identify the geological disasters in the early stage.Therefore,a deformation monitoring technology with extensive observation capabilities and periodic monitoring capabilities is necessary to conduct general surveys and monitor the surface deformation in urban areas.Combining the advantages of interferometric technology in the sensitivity of deformation measurement,combined with the features of synthetic aperture radar sensor surface measurement and the advantages of radar image in spatial resolution,Interferometric Synthetic Aperture Radar(InSAR)will be applied.Which overcome the shortcomings of traditional deformation monitoring technology,achieve the identification of small deformation in the monitoring range.The Time-Series InSAR technology(TS-InSAR)is based on the InSAR technology to obtain the deformation history of the study area.In this paper,the TS-InSAR technology is used to obtain the annual average rate distribution of deformation and the time series of deformation of coherent targets in two adjacent coastal cities in Shenzhen and Hong Kong Special Administrative Region.At the same time,the multi-period static network method is used to calculate the three-dimensional deformation time series of the stations in the GNSS observation network in the Hong Kong Special Administrative Region.Based on the spatial analysis of several ground settlement areas found in the observation results,it is concluded that the reclamation area and underground engineering development area in the study area are areas where settlement phenomena are concentrated.In these areas,two different TS-InSAR techniques were used to study the deformation characteristics,and it was concluded that the PSI method is superior to the SBAS method in terms of spatial resolution.The GNSS results show that the monitoring results of most stations in the network are in a stable state,and the deformation results obtained by local stations and TS-InSAR have a certain consistency in trend.Experimental results show that TS-InSAR has the capability of periodically monitor terrain changes.Compared with GNSS technology,the deformation monitoring results obtained by TS-InSAR have higher spatial resolution.Therefore,TS-InSAR has a significant advantage in the census task of surface deformation.The two main achievements of the urban surface deformation velocity field and the deformation time series of ground-related target points obtained by using TS-InSAR technology are of reference value to the census research of surface deformation and disaster assessment of surface deformation...