Study Of The Application Of InSAR Technology In Monitoring Subsidence

In recent years,the problem of ground subsidence all across the world is becoming more and more prominent in the world with the acceleration of modernization process,causing massive losses for production and life and seriously restricting the sustainable development of economy and society.The differential interferometric synthetic aperture radar is constantly developed depend on its all-weather,wide range,high precision and other advantages to provide a new way to monitor the ground subsidence and predict the disasters.On the basis of analyzing the harmlessness of ground subsidence caused by underground water and coal mine resources and the related technical theoretical model of InSAR,the error impact of D-InSAR on monitor the ground subsidence and the optimal selection method of differential interferometric time-series in SBAS-InSAR technique are deeply studied and analyzed,and the ground subsidence caused by coal mining in Jining area of shandong province is monitored by the D-1nSAR and SBAS-InSAR.The main research contents and results are as follows:(1)The necessity of ground subsidence monitoring and the research status of InSAR in monitoring ground subsidence are analyzed systematically,then it is pointed out that InSAR technique has significant advantages in ground subsidence monitoring caused by ground water and coal mine area.The principle and imaging characteristics of SAR imaging are described in detail,and the basic principles and practical data processing procedures of InSAR,D-InSAR and SBAS-InSAR are studied and analyzed.(2)The error impact of D-InSAR on monitor the ground subsidence is studied and analyzed.Based on the basic principle of D-InSAR,some error sources of D-InSAR in monitoring ground subsidence are discussed.And the effect of external DEM on monitored mine subsidence is systematically investigated from theory and in practical applications.The accuracy and difference of the three commonly used DEM are analyzed in detail:1:5 ?,ASTER GDEM V2 and SRTM in theory.Combined with the Dongtan and Yangcun mine of Jining coal in Shandong province,the influence of DEM error on ground subsidence is analyzed by comparing three kinds of different accuracy of DEM.to effectively remove DEM error and improve InSAR monitoring accuracy.(3)The optimal selection method of differential interferometric time-series in SBAS-InSAR technique and its application effect are studied and analyzed.On the basis of the deformation model and solution methods of SBAS-InSAR were systematically investigated and give the composing mode and optimizing selection method of differential interferometric time-series,five differential interferometric time-series with different quantity and quality were selected by using total correlation and time and space baseline threshold condition optimization,to monitor the Beijing urban areas during January 2007 and October 2010,the distrubutions and 1D Line of Slight(LOS)velocities of ground subsidence in the same study area and time period are obtained,and compared the monitoring results by leveling and GPS.(4)In the view of the ground subsidence caused by coal mining in Jining area of Shandong province is discussed,the different data sources(TerraSAR-X data and ENVISAT ASAR data)are processed based on D-InSAR and SBAS-InSAR respectively.The ground subsidence caused by coal mining are monitored and investigated in different periods in Jining area,and the accuracy of the data was compared with the level data respectively.So it can provide theoretical support and technical support for the comprehensive management and sustainable development of Jining coal mine.