利用时序InSAR技术分析北京及河北廊坊地面沉降

利用带大气估计模型的时序InSAR方法对24幅覆盖北京及河北廊坊的Envisat-ASAR影像数据进行了时序分析,获取了该地区2007年4月—2010年9月的地面沉降速率及均方差。发现了以北京朝阳区和通州区交界处为中心和以河北廊坊城区为中心的两个沉降区域,中心区平均沉降速率分别为35mm/a与22mm/a。研究区域形变速率均方差1.5mm/a。研究结果表明:利用时序InSAR技术进行城市地表沉降监测具有较好的精度及稳定性;产生该沉降的可能原因为地下水的开采、城市基础建设的发展及工业用地量、人为活动的增加。

Land subsidence monitoring of Beijing and Langfang of Hebei prouince by time series InSAR

This paper use InSAR Time Series with Atmospheric Model technology to obtain ground surface deformation field and its mean square deviation by 24 Envisat-ASAR image data which covering Beijing and Langfang between 2007.04 and 2010.09.Two subsidence areas are found.One is located at the junction of Chaoyang District and Tongzhou District of Beijing,and the other is located at Langfang City of Hebei.The average subsidence rates of the central region are 35 mm/a and 22 mm/a respectedly.The mean square deviation of subsidence rate is less than 1.5 mm/a.The results show that:Surface subsidence monitored by time series InSAR technology has good accuracy and stability;Groundwater exploitation is the main reason of subsidence.Besides,the urban infrastructure construction and the increase of industrial land and human activities also have a significant impact on surface subsidence.