基于SBAS技术的四川阿坝州小金县地表形变监测

Monitoring the ground subsidence in Xiaojin County,Sichuan Province based on small baseline subset technique

近年来,滑坡、地裂缝等地质灾害严重威胁人民生命财产安全,而在山区众多的四川省,此类现象更为明显,给居民带来的影响也更加严重。合成孔径雷达干涉测量(InSAR)技术具有全天时、全天候、范围广的特点,在获取地表形变信息上有一定的优势,短基线集技术(SBAS)是一种时序InSAR技术,其监测的精度更高,可以检测到mm级别的形变。研究采用SBAS技术,使用Sentinel-1A数据对四川省阿坝州小金县地区进行地表形变监测。实验发现小金县地区下沉速率快、下沉现象明显的区域,为地质灾害的预防及持续监测提供理论基础。

In recent years, the geological hazard such as landslides and ground fissures seriously threaten the safety of people＇s lives. In Sichuan Province, where many mountains are located, such phenomena are more pronounced, and the impact on residents is more serious. The synthetic aperture radar interferometry （InSAR） has all day, all weather and wide range features, which are several advantages in obtaining surface subsidence information. Small baseline subset （SBAS） is a time series InSAR technique, whose accuracy of monitoring is higher, and can detect millimeter level deformation. This papaer uses Sentinel 1A data to monitor surface subsidence in Xiaojin County, Sichuan Province by SBAS technique. The experimental results show that the area whose rate of subsidence is rapid and significant in Xiaojin County, provide a theoretical basis for the prevention and continuous monitoring of geological disasters.