利用PSInSAR方法反演大时空尺度地表沉降速率  

Ground Subsidence Rate Inversion of Large Temporal and Spatial Scales Based on Extended PSInSAR Method

作　　者：罗三明[1] 杜凯夫[1] 万文妮[1] 付黎明[1] 李永坤[1] 梁福逊[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《武汉大学学报（信息科学版）》2014年第9期1128-1134,共7页Geomatics and Information Science of Wuhan University

基　　金：地震科技星火计划资助项目(XH13036);中国地震局地震研究所所长基金资助项目(IS201266111)~~

摘　　要：通过时间基准和空间基准的连接,对PSInSAR方法进行了扩展,对覆盖华北平原约20万km2的500余景Envisat ASAR数据进行了处理,获取了该地区2006~2010年的地表沉降速率。分析表明,华北平原多个沉降中心沉降速率处于较高发展态势,从北京-廊坊-天津到任丘、沧州、泊头、衡水、德州、南宫,再到邯郸,地面沉降已连成一片;天津市的静海-滨海地面沉降最为突出,两地沉降中心区的平均沉降速率分别达到62mm/a和67 mm/a,北京东部、沧州、泊头-衡水-德州、邯郸等老沉降区的沉降速率分别达到36 mm/a、34mm/a、37mm/a、29mm/a。利用天津地区同期水准测量结果检验了本文的研究结果,差值均小于10mm,表明PSInSAR方法反演结果与水准测量获得的结果是一致的。Estimation of processes for slow change in small scale surfaces is one of the main advantages of PSInSAR technology. We present a mathematical framework for the datum connection for timespace referencing, applying it to 500 scenes composed of Envisat ASAR images covering about 200 000 km2 of the North China Plain, obtained the rate of ground subsidence in the study area during the period of 2006-9010. The experimental results show that. （1） the multiple subsidence centers in North China Plain were still in an evolving state, connecting Beijing, Langfang, Tianjin, Renqiu, Cangzhou, Botou, Hengshui, Dezhou, Nangong and Handan into a continuous area. （2） The most prominent ground subsidence was in Tianjin＇s Jinghai and Binhai areas having average subsidence rates of 62mm/a and 67mm/a along the line of sight, respectively. The subsidence of the old centers, to the east of Beijing, Cangzhou, Botou - Hengshui - Dezhou, Handan, had rates of 36mm/a, 34mm/a, 37mm/a, 29mm/a,respectively. （3） The experimental results were validated with leveling data in Tianjin area. The difference between the two methods is less than 10 mm, which shows that the results obtained by the PSInSAR technique are consistent with those obtained by leveling. （4） The results here presented can be used as development prevention reference measures of regional ground subsidence.

关 键 词：华北平原 时间基准和空间基准 地表缓慢变化 PSINSAR 地表沉降速率 

分 类 号：P237.9[天文地球—摄影测量与遥感]