中巴走廊沿线地质灾害频发,通过监测地表微小形变有助于对研究区内地质灾害进行判别分析,对走廊建设及走廊沿线基础工程设施的防护有重要意义。利用2015年4月5日—2018年12月9日共30景Sentinel-1A干涉宽幅模式下的雷达影像,分别采用PS-InSAR技术及SBAS-InSAR技术,对中巴走廊盖孜河谷段进行地表形变时序信息提取。结果表明,采用两种方式获取的形变信息在形变速率的空间变化趋势上具有较好的一致性,其中SBAS-InSAR技术所获取的形变速率分布在空间上相对更为连续。SBAS-InSAR形变提取结果表明,在分析时间段内,研究区多处发生明显地表形变,较大的视线向形变量主要分布于中巴公路两侧斜坡及布伦口以北的冰川前缘区域。在提取时序形变信息基础上,结合光学影像对研究区内典型不稳定斜坡及冰川运动进行形变特征分析,结果表明不稳定斜坡上PS点在监测时段内累积形变量可达-30 mm,而在冰川运动前缘集中分布许多正负向形变值较大的PS点,其正负向累积形变量分别可达+60 mm和-80 mm。本研究为高寒山区地质灾害形变的探测和今后在中巴走廊的应用积累了基础。
汪钰晴
,
唐伶俐
,
王新鸿
,
周增光
,
李子扬
,
李传荣
. 基于时序InSAR技术的中巴走廊盖孜河谷段地表形变分析[J]. 中国科学院大学学报, 2022
, 39(3)
: 343
-351
.
DOI: 10.7523/j.ucas.2020.0046
Geological disasters occur frequently along the China-Pakistan Corridor, and the monitoring of small surface deformations can help discriminate and analyze the geological disasters in the study area, which is of great significance to the construction of the corridor and the protection of basic engineering facilities along the corridor. Based on a total of 30 Sentinel-1A radar images in the interference wide-range mode acquired from April 5, 2015 to December 9, 2018, the time-series surface deformation extraction of the Gaizi valley section of China-Pakistan Corridor was carried out using PS-InSAR and SBAS-InSAR technologies. The results show that the deformation information obtained by the two methods is rather consistent in the spatial variation trend of deformation rate, and the deformation rate map obtained by the SBAS-InSAR technology is relatively more continuous in spatial distribution. According to the SBAS-InSAR deformation results, during the analysis period, obvious surface deformation occurred in many places in the study area, and the relatively large line-of-sight deformation mainly distributed on the slopes on both sides of the China-Pakistan Highway and on the glacial front area northern to the Bulunkou. Using the extracted time series deformation information and with the help of optical images, the deformation characteristics of typical unstable slopes and glacial movements were analyzed. On unstable slope, the cumulative deformation of PS points on the upper part of the slope can reach -30mm during the monitoring period. In terms of glacier movement, many PS points with large positive and negative deformation values are concentrated on the front edge of the glacier, and the cumulative positive and negative deformations can reach +60 mm and -80 mm. The paper can accumulate preliminary experience for the detection of geological hazard related deformation in the alpine mountain area and benefit for its future applications to the China-Pakistan Corridor.
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