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- Title
中巴经济走廊洪扎段潜在滑坡SBAS-InSAR早期识别及发育特征分析.
- Authors
苏, 晓军; 张, 毅; 孟, 兴民; Ur, Rehman Mohib; Zainab, Khalid; 赵, 富萌; 岳, 东霞; 郭, 富赟; 周, 自强
- Abstract
The Hunza Valley in the China–Pakistan Economic Corridor (CPEC) in the northern part of Pakistan has a high relief and harsh geo-environment. Villages and towns in this area are prone to geohazard development, and high-risk incidents have been observed from the construction to operation stages of the CPEC. Landslide hazards in the Hunza Valley must be investigated and analyzed via landslide inventories and landslide development tools. This study applied 45 images and 42 images from the ascending and descending Sentinel-1A datasets, respectively, to monitor surface deformation via SBAS-InSAR. The deformation information along the slope direction was subsequently estimated. On the basis of the displacement rates derived from the SAR data, the optical remote sensing images were visually interpreted, and in situ surveys and validations were conducted. A total of 53 potential landslides were detected and delineated. On the basis of the effects of landslide identification and the detected deformation, image interpretation and validation features of typical large landslides Ghulmet and Humarri, 11 factors related to geomorphology, geology, hydrology, and vegetation were analyzed for landslide development. Maximum displacement velocities of -311 and -490 mm/a along the slope were detected on the basis of the ascending and descending datasets, respectively. Consequently, an annual deformation velocity of 20 mm/a was set as the threshold for the detection and mapping of potential landslides in the Hunza River Valley. The deformation of large landslides is severe under the influence of Hunza River erosion, and secondary landslides are developed. The validated potential landslides are distributed on the slopes on both sides of the Hunza River and are sometimes on the upper and lower slopes of the road. These active landslides primarily are developed in metamorphic rocks such as phyllite and slate. In the CPEC, landslides preferentially form and deform in areas where the elevation relief is between 200 and 1000 m, the slope is between 30° and 40°, and the aspect is within the southern and southwestern regions. Given the bare area of slope surfaces and sparse vegetation (NDVI<0.2), weathered and fragmented slopes provide enough provenance and materials for landslide development. The outcomes and results may facilitate hazard management and risk reduction in the Hunza Valley, allowing the operation of the CPEC to be uninterrupted. The findings of this work can also provide scientific references and data support for the monitoring and assessments of major landslide disasters that destroy roads and block rivers and their resulting secondary disaster events.
- Subjects
PAKISTAN; LANDSLIDES; OPTICAL remote sensing; DEFORMATION of surfaces; IMAGE analysis; METAMORPHIC rocks; SURFACE area
- Publication
Journal of Remote Sensing, 2024, Vol 28, Issue 4, p885
- ISSN
1007-4619
- Publication type
Article
- DOI
10.11834/jrs.20221536