D-InSAR技术在库区滑坡监测上的实例分析
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摘要
基于微波遥感的差分干涉合成孔径雷达(Differential Synthetic Aperture Radar interferome-try,D-InSAR)技术,可以获得连续大面积区域上非常小的地表形变,具有高精度、高分辨率、大面积、全天候、监测成本低,以及能够监测人员无法进入的区域等优点,是非常具有潜力的地面活动辨识和监测技术。目前,已成为滑坡、沉降、地震、火山等地质灾害活动调查监测实践应用的研究热点。本文采用ALOS卫星PALSAR传感器获取的5景SAR数据,利用D-InSAR技术对金沙江下游乌东德水电站库区附近大面积区域内的滑坡活动进行了辨识和分析,利用D-InSAR技术的两轨和三轨法获得了研究区域内从2007-07-12到2008-07-14的368d及2008-01-12到2008-04-13的92d的详细滑动位移图,表明了研究期间内研究区域各个位置的位移滑动状态。通过两个不同时间期间滑动位移图的比较和分析,确定了研究区域潜在的滑坡滑动区域和危险区域。并对研究区域正处活动状态的L1R-6号滑坡进行了详细的分析和研究,确定了滑坡的风险区域,并将其监测结果与GPS监测进行了比较研究,得出其整体形变和运动趋势基本相一致的结果。
Differential Synthetic Aperture Radar Interferometry(D-InSAR),which allows to analysis very small ground movement and to cover in continuity large areas,and with the advantage of high-accuracy,high-resolution,all-weather,low-cost and covered inaccessible area,has turned out to be a very useful technique for detecting of ground movement.Therefore,it has been widely used for geological hazard investigating on subsidence,landslide,earthquake and volcanic activity.In this paper,D-InSAR techniques has been used to identify and monitor the landslide moving in wide area of certain hydropower reservoir in Jinsha river.Five SAR acquisitions(L-band,HH-polarized) are acquired from PALSAR Sensor of ALOS satellite.Two-Pass and Three-Pass method of D-InSAR technique was used to derived the 368 days(2007-07-12-2008-07-14) and the 92 days(2008-01-12-2008-04-13) detail moving displacement map,the displacement result vividly illustrates the various positions displacement state of the study area in the study time period,the potentially moving landslide areas and landslide hazard areas can then be identified by the analysis and comparison of two differential study time period.At the same time,No.L1R-6 landslide in active state was researched in detail and the same deforming tendency with the Global Positioning System(GPS) monitoring result is obtained.
Differential Synthetic Aperture Radar Interferometry(D-InSAR),which allows to analysis very small ground movement and to cover in continuity large areas,and with the advantage of high-accuracy,high-resolution,all-weather,low-cost and covered inaccessible area,has turned out to be a very useful technique for detecting of ground movement.Therefore,it has been widely used for geological hazard investigating on subsidence,landslide,earthquake and volcanic activity.In this paper,D-InSAR techniques has been used to identify and monitor the landslide moving in wide area of certain hydropower reservoir in Jinsha river.Five SAR acquisitions(L-band,HH-polarized) are acquired from PALSAR Sensor of ALOS satellite.Two-Pass and Three-Pass method of D-InSAR technique was used to derived the 368 days(2007-07-12-2008-07-14) and the 92 days(2008-01-12-2008-04-13) detail moving displacement map,the displacement result vividly illustrates the various positions displacement state of the study area in the study time period,the potentially moving landslide areas and landslide hazard areas can then be identified by the analysis and comparison of two differential study time period.At the same time,No.L1R-6 landslide in active state was researched in detail and the same deforming tendency with the Global Positioning System(GPS) monitoring result is obtained.
引文
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[10]Singhroy V,Alasset P-J,Couture R,et al.InSAR monito-ring of landslides on permafrost terrain in Canada.Interna-tional Geoscience and Remote Sensing Symposium(IGARSS),Boston,Massachusetts,USA:July 6-11,2008,2451-2454.
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[12]王桂杰,谢谟文,邱骋,江崎哲郎.D-INSAR技术在大范围滑坡监测中的应用[J].岩土力学,2010,31(4):1337-1344.
[13]李会中,王团乐,段伟峰,等.金坪子滑坡形成机制分析与河段河谷地貌演化地质研究[J].长江科学院院报,2006,23(4):17-22.
[14]谢谟文,江崎哲郎,邱骋,等.空间三维滑坡敏感性分区工具及其应用[J].地学前缘,2007,14(6):73-84.
[15]Ferretti A,Prati C,Rocca F.Permanent Scatterers InSARinterferometry.IEEE Transactions on Geoscience and Re-mote Sensing,2001,39(1):8-20.
[16]Gili J-A,Corominas J,Rius J.Using Global PositioningSystem techniques in landslide monitoring.Engineerin.Ge-ology,2000,55:167-192.
[2]Fruneau B,Achace J,Delacourt C.Observation and model-ing of the Sant-Etienne-de Tine′e landslide using SAR inter-ferometry.Tectonophysics,1996,265:181-190.
[3]Achache J,Fruneau B,Delacourt C.Applicability of SARinterferometry for operational monitoring of landslides.In:Proceedings of the Second International Workshop on ERSApplications.London,6-8December 1995,165-168.
[4]Vietmeier J,Wagner W,Dikau R..Monitoring moderateslope movements(landslides)in the southern French Alpsusing differential SAR interferometry.In:Proceedings of2nd International Workshop on ERS SAR Interferometry.Liège,Belgium,10-12November.1999.
[5]Rizzo V.,Tesauro M.2000.SAR interferometry and fielddata of Randazzo landslide(Eastern Sicily,Italy).Physicsand Chemistry of the Earth,25(9):771-780.
[6]Paolo B,Mario C,Giorgio F,et al.Use of differential SARinterferometry in monitoring and modelling large slope insta-bility at Maratea(Basilicata,Italy).Engineering Geology,2003,68:31-51.
[7]Squarzoni C,Delacourt C,Allemand P.Nine years of spa-tial and temporal evolution of the La Valette landslide ob-served by SAR interferometry.Engineering Geology,2003,68(1-2):53-66
[8]Colesanti C,Wasowski J.Investigating landslides withspace-borne Synthetic Aperture Radar(SAR)Interferome-try.Engineering Geology,2006,88:173-199.
[9]Singhroy V,Couture R,Molch K,et al.InSAR monitoringof post-landslide activity.International Geoscience and Re-mote Sensing Symposium(IGARSS).Denver,Colorado:July 31-Aug.4,2006,1635-1638.
[10]Singhroy V,Alasset P-J,Couture R,et al.InSAR monito-ring of landslides on permafrost terrain in Canada.Interna-tional Geoscience and Remote Sensing Symposium(IGARSS),Boston,Massachusetts,USA:July 6-11,2008,2451-2454.
[11]廖明生,林珲.合成孔径雷达干涉原理和信号处理[M].北京:测绘出版社.
[12]王桂杰,谢谟文,邱骋,江崎哲郎.D-INSAR技术在大范围滑坡监测中的应用[J].岩土力学,2010,31(4):1337-1344.
[13]李会中,王团乐,段伟峰,等.金坪子滑坡形成机制分析与河段河谷地貌演化地质研究[J].长江科学院院报,2006,23(4):17-22.
[14]谢谟文,江崎哲郎,邱骋,等.空间三维滑坡敏感性分区工具及其应用[J].地学前缘,2007,14(6):73-84.
[15]Ferretti A,Prati C,Rocca F.Permanent Scatterers InSARinterferometry.IEEE Transactions on Geoscience and Re-mote Sensing,2001,39(1):8-20.
[16]Gili J-A,Corominas J,Rius J.Using Global PositioningSystem techniques in landslide monitoring.Engineerin.Ge-ology,2000,55:167-192.
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