InSAR形变大数据在沿江城市中的研究与应用

Research and application of insar deformation big data in cities along the river

沿江城市普遍存在填湖、填江造陆,季节性形变,江水侵蚀沿岸等现实情况。以长江洞庭湖段岳阳市岳阳楼区为研究区域,基于COSMO-SkyMed卫星星座,应用时序合成孔径雷达干涉测量技术(MT-InSAR)对研究区进行形变监测。结果表明:江水由宽江道进入窄江道,窄江道承受的切应力明显增大,分别由26~47 N/m^(2)增大到50~53 N/m^(2);沿江(城陵矶港)季节性形变与降雨相关性较低,非沿江季节形变与降雨相关性较高,非沿江地区形变活跃期具有周年变化的特点,沿江形变活跃期约在230~360 d期间;对沿江和非沿江形变信号进行谱分析,两者形变信号在频域上具有明显差异,此种差异具有作为洪水灾害指示信号的潜力。

The cities along the river are generally filled with lakes and rivers;seasonal deformation;river water erosion along the coast and other realities.Taking Yueyanglou District,Yueyang City,Dongting Lake section of the Yangtze River as the research pilot,based on COSMO-SkyMed satellite constellation,time series synthetic aperture radar interferometry(MT-InSAR)was applied to conduct large data deformation monitoring in the study area.The result of InSAR shape change rate big data mining show that:when the river flows from wide channel to narrow channel,the shear stress of narrow channel increases significantly,from^(2)6~47 N/m^(2) to 50~53 N/m^(2);T he correlation between seasonal deformation along the river(Chenglingji Port)and rainfall is relatively low,while that between non riverside seasonal deformation and rainfall is relatively high.The active period of deformation in non riverside areas has the characteristics of annual change.The active period of deformation along the river is about 230~360 days;the spectrum analysis of deformation signals along the river and non-river shows that there are obvious differences between the deformation signals in the frequency domain,and this difference has the potential as an indicator signal of flood disaster.