基于SBAS-InSAR的昆明地面沉降监测研究

昆明主城区位于滇池以北沉积平坝区,高原湖相沉积软土分布广泛,在荷载作用下容易产生地面沉降。本文利用短基线(SBAS)技术对昆明市主要区域(近900km2)进行大规模的地面沉降研究。实验中采用了17景C波段ENVISAT ASAR雷达影像和9景L波段ALOS PLASAR雷达影像,利用StaMPS软件SBAS算法反演昆明市2007-2010年的地面沉降。两种影像的时间序列分析结果均表明:小板桥、河尾村等沉降中心沉降速率持续上升;三竹营、吴家营、小渔村等新的沉降中心正在形成;吴家营、大塘子、河尾村、小渔村、雨龙村等沉降中心已经连为一体。得出的地面沉降趋势与实地历史水准测量结果较为一致,验证了SBAS技术进行地面沉降监测的可靠性和有效性。

SBAS-InSAR Monitoring of Land Subsidence in Kunming

Kunming city is locating in the north of Dian lake,characterized by the presence of plateau lacustrine clay-rich sedimentary formations.And this characteristic makes Kunming particularly prone to several geological hazards, such as land subsidence.In this paper,the Small Baseline Subset(SBAS)is used to monitoring the land subsidence of the main area of Kunming(about 900 km2 ).StaMPS(Stanford Method for Persistent Scatterers)SBAS approach is used to extract ground subsidence rates in Kunming based on 9 ALOS PLASAR and 17 ENVISAT ASAR acquisitions,which cov-ering the period from 2007 to 2010.The two kinds of time series analysis results exhibit that the subsidence velocity of several subsidence funnels,such as Xiaobanqiao and Heweicun,are rising.Sanzuying,Wujiaying,Xiaoyucun and several other new subsidence funnels are generating.Moreover,some subsidence funnels such as Wujiaying,Datangzi,Heweicun, Xiaoyucun and Yulongcun are becoming a big whole subsidence funnel.The trend of land subsidence we have got agreed well with the history level measurement results of Kunming,indicating the reliability and validity of the SBAS technology in monitoring the land subsidence.