InSAR用于高山峡谷区滑坡监测的适用性

Applicability of InSAR Landslide Monitoring in the Alpine and Canyon Areas

针对升降轨Sentinel-1A数据获取的得荣县古学乡2个大型滑坡形变特征不一致的问题,利用R指数、敏感性和相干性等参数,开展InSAR技术用于该地区滑坡监测的适用性研究。结果表明,降轨数据比升轨数据更适合2处大型滑坡的识别与监测,并很好地解释了升降轨滑坡监测结果不一致的原因。对2个滑坡进行时间序列形变分析及多维形变特征分解,结果表明,2个滑坡在2019~2020年累积形变量最大值分别约为300 mm和230 mm,需加强关注。

Aiming at the inconsistency of deformation characteristics of two large landslides in Guxue town,Deyong county,obtained from Sentinel-1A data of ascending and descending orbits,we study the applicability of InSAR technology for landslide monitoring in this area by using R index,sensitivity,and coherence parameters.The results show that the descending data is more suitable for the identification and monitoring of the two large landslides than the ascending data and can explain the reason of the inconsistency of the landslide results.We undertake time series deformation analysis and multi-dimensional deformation feature decomposition for the two landslides.The results show that the maximum cumulative deformation values of the two landslides from 2019 to 2020 are about 300 mm and 230 mm,respectively,and more attention should be paid to them.