| Citation: | ZHAO Chaoying,
LIU Xiaojie,
GAO Yang,
et al.,
2022. Early identification of high-elevation geohazards in the lower Yarlung Zangbo River based on the SAR/InSAR technology. Journal of Geomechanics, 28 (6): 981-994. DOI: 10.12090/j.issn.1006-6616.20222825
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The lower stream of the Yarlung Zangbo River is in the front zone of the collision between the Indian and Eurasian plates with active neotectonics movements and many high mountains in this region. It is a typical mountain-valley area. Due to the unique geological structure and the influence of climate change, geohazards such as collapses, landslides, and mudslides frequently happen in this area. We used Sentinel-1 and ALOS/PALSAR-2 images to identify the high-elevation geohazards in the region from 2014 to 2020 by combining multiple time-series InSAR techniques and SAR offset-tracking techniques. The identification results show that there are 260 geohazard-induced deformed areas in the study area, and most of them are located in gullies and peaks at higher elevations. The rock avalanche deformations in the Zebalongba glacier gully have formed several large tension cracks, and once the avalanche falls, they are most likely to form a dam. The back edge of the Dabo landslide, which was reactivated by the Milin earthquake, has completely been detached, and the cracks fully penetrate the left and right sides. Once the landslide destabilizes, it will completely block the Yarlung Zangbo River. This study provides a general method for identifying high-elevation geohazards in high mountain-valley areas and a reference for similar geohazards identification.
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