Surface Deformation Monitoring Reliability Research Based On InSAR Technology

Bai Longjiang Valley,located in Gansu province,is one of regions which have the most frequent geological disasters(debris flow,landslide)in China.A variety of geological disasters caused huge economic losses and harms the personal property safety of the people.However,Simple artificial measures,in the alpine valleys,vegetation coverage of the area can't be effective monitoring.How to monitor and make use of the surface deformation in the process of fault activity is the main research content of this thesis.The main conclusions are as follows:Taking the estuary to Wudu region as the research area,this study used ENVISAT ASAR data and StaMPS MTI technology to monitor the surface deformation of the area,Combined with the dislocation model to inversion parameters,using the parameters of the inversion to forward simulation of ground deformation in the region,compared the results with MTI monitoring data analysis,analyzed summarizes the fault structure and the relationship between the geological disasters in the end.(1)Analysis of the effect of fault activity of geological disasters in research area.Fault in distance of 3.0 km of landslide development very much in research area,Compared with the correlation of fault is high.Analyzed on Pingding-Huama fault zone formation mechanism of the landslide and divided the evolution process into four period-fault tectonic geomorphic period,pleistocene loess deposition period,fault zone landslide formation period and landslide extension period.Deep fault that between tectonic units have obvious control effect on the distribution pattern of debris flow in research area.Analysis found that the abundant accumulation of loose solid material,steep terrain in the basin,abundant rain provides conditions for the occurrence of debris flow.(2)MTI techniques is used to collect the surface deformation rate in the study area in May 2008 to September 2010,focused on the deformation rate-7.1-5.1 mm/year of ground deformation point accounted for 90.96%of the total deformation point.(3)Using MTI technique to collect the deformation cumulant in research area in May 2008 to September 2010,Combining with simplified dislocation model,Using the linear least squares and nonlinear Monte Carlo inversion algorithm for fault dislocation splitting component inversion,using the inversion of the tensile fracture component simulation calculation deformation quantity of the study area,analyzed the result with the MTI technique.It is showed that using simplified dislocation model combined with MTI technology to monitor the surface deformation is feasible.