利用Sentinel-1A数据和TCP-InSAR技术监测金沙江中游兴培当至草可都段滑坡

Monitoring landslide movements in Xingpeidang-Caokedu section of middle Jinsha River with TCP-InSAR and Sentinel-1 data1

金沙江是我国重要的水电供给基地,然而伴随着库区蓄水,有可能导致地下水位变化,致使原本稳定的堆积体发生滑坡灾害。而传统的监测手段主要是通过水准及GPS测量,其空间分辨率较低,难以满足要求,且人力、物力成本较高。合成孔径雷达干涉测量技术(InSAR)具备大范围、高空间分辨率的特点,而近年发展出来的时域相干点技术(TCP-InSAR),具备监测mm级形变精度的能力,在火山、滑坡及城市基础设施监测方面得到一定应用。文中利用哨兵一号A星(Sentinel-1A)数据,通过使用时域相干点目标技术(TCP-InSAR),获取金沙江中游兴培当至草可都段的滑坡结果。研究发现该地区存在6处主要滑坡区域,其中4处为常年活动的滑坡,两处为间断性活动的滑坡。通过结合从NOAA获取的气象资料及当地地质情况,发现该区域滑坡的主要影响因素为降雨和气温的变化。

Jinsha River is one of the most important sources of hydropower in China.However,due to the variation of groundwater levels after the accomplishment of water storage in Jinsha River,the landslide would occur in the talus slides.The traditional methods(e.g.GPS and leveling)cannot satisfy the requirement of high spatial resolution and large coverage.Synthetic aperture radar interferometry(InSAR)is a technology with the characteristic of large coverage,high spatial resolution and low cost.Temporarily coherent points InSAR(TCP-InSAR)is a recently developed algorithm,which has been used for the monitoring of volcano,landslide and urban infrastructure with the precision of millimeter accuracy.This paper retrieves the landslide movements in Xingpeidang-Caokedu section of middle Jinsha River with Sentinel-1A data by using the TCP-InSAR method.The result reveals that there are 6 main landslides in the study area,including 4 landslides with long-term movements and 2 landslides with discontinuity movements.By exploiting the temperature,precipitation and local geological,it is found that the temperature and precipitation are the main factors in landslide movements.