基于 C 波段和 L 波段的 SBAS-InSAR 技术监测广州地面沉降

近10年来广州市频繁发生地面沉降、塌陷等地质灾害,造成巨大的生命财产损失,而且目前仍然在加剧。传统的监测技术如GPS、水准测量等难以开展大范围、高精度和高空间分辨率的地表沉降监测工作,而合成孔径雷达干涉测量技术(InSAR)正逐渐成为城市地表沉降监测的有效手段。文中采用短基线集(SBAS-InSAR)技术,通过17景ENVISAT/ASAR数据和21景ALOS/PALSAR数据,探测广州佛山地区2006—2011年的地表形变信息。将其与研究区内已有的水准测量数据进行比较,从而验证InSAR技术监测结果的可靠性。最后圈定了研究区的重点沉降区域并对沉降成因进行分析。

Ground subsidence monitoring in Guangzhou with SBAS-InSAR technique based on C- and L-band

In recent 10 years , frequently reported geological disasters such as ground subsidence have occurred in Guangzhou area ,causing huge damages to people’s life and property .More seriously ,these disasters are continuing and further developing .However ,traditional monitoring means ,such as leveling and GPS surveying cannot meet the requirements of large-scale , high-resolution and high-precision monitoring for the surface subsidence . InSAR technique has gradually become an efficient way in monitoring surface subsidence .This paper uses the SBAS-InSAR technology based on high coherent and strong steady points to monitor the deformation field of Guangzhou and Foshan areas from 2006 to 2011 with 17 ENVISAT /ASAR images and 21 ALOS/PALSAR images respectively .Then the InSAR results are compared with the leveling data in the research area to validate InSAR technique’ s reliability . Ultimately ,analysis is made on the main subsidence areas and the reasons of ground subsidence .