PS-InSAR技术在兰州市地面形变中的监测应用

近年来,由于城市地表沉降带来的次生灾害后果愈加严重,给城市的发展带来了诸多隐患,因此对城市进行长时间序列的形变监测具有重要的现实意义,而传统的监测方法无法获取城市大面积的地表形变信息.合成孔径雷达遥感(interfer-ometric synthetic aperture radar,InSAR)技术在大规模地表形变监测中具有独特的优势.兰州市地质条件特殊,地貌条件复杂,是中国地质灾害发生频率较大的区域之一.采用63景Sentinel-1A和5景Sentinel-1B数据基于永久散射体合成孔径雷达干涉(persistent scatterer interferometric synthetic aperture radar,PS-InSAR)测量技术获取了2014年10月—2020年4月的兰州市城区的地面形变场.研究结果表明,兰州市城区地表形变较小,临近城区周边的几处村镇存在着不同程度的沉降,且部分区域的沉降呈现出逐渐加快的趋势.

Application of PS InSAR Technology in ground deformation of Lanzhou CityMonitoring application

In recent years, the secondary disasters caused by urban surface subsidence have become more serious and have brought many hidden dangers to the development of the city. Therefore, long-term deformation monitoring of the city has important practical significance, while traditional monitoring methods Unable to obtain information on the surface deformation of a large area of the city. Interferometric synthetic aperture radar (InSAR) technology has unique advantages in large-scale surface deformation monitoring. Lanzhou City has special geological conditions and complex geomorphic conditions. It is one of the areas where geological disasters occur frequently in my country. In this paper, 63 scenes of Sentinel-1A and 5 scenes of Sentinel-1B are used to obtain the ground surface of Lanzhou city from October 2014 to April 2020 based on Persistent scatterer interferometric synthetic aperture radar (PS-InSAR). Deformation field. The research results show that the surface deformation in the urban area of Lanzhou is relatively small, and several villages and towns adjacent to the urban area have different degrees of subsidence, and the subsidence in some areas has gradually accelerated.