Abstract
The Jinsha River flows through one of the most geologically complex regions in western China with extremely high altitudes and capricious climates. Frequent landslides (e.g., the Baige landslides on 11 October and 3 November 2018) occurred along its stretch which posed severe damage to bridges, dams, and roads, and put the safety of local residents at risk. Systematic and comprehensive landslide detection has been rarely carried out in the Jinsha River corridor because it is a wide and hard-to-reach region. With 30 years of development, InSAR has become an effective way to map ground motion, which in turn makes it feasible to detect active landslides over wide regions. However, several challenges remain in applying InSAR in the Jinsha River corridor, such as low coherence due to dense vegetation and/or large gradient surface movements, and atmospheric effects due to the spatio-temporal variations of the atmosphere (especially the part due to tropospheric water vapor). In this paper, we propose a framework to overcome the limitations of conventional InSAR through the integration of GACOS-assisted InSAR, advanced SBAS InSAR, and SAR pixel offset tracking techniques. This integrated framework enables us to detect active landslides under complex topographic and climate conditions. Our results show that the detected active landslides are largely controlled by active faults, most of them are found at elevations of 2500–4000 m, their slopes fall between \(25\) and \(45^\circ\) facing southwest and northwest, and 83.3% of the active landslides have a NDVI value of less than 0.3. Furthermore, precipitation is one critical triggering factor of active landslides, evidenced by the high temporal correlation between average precipitation and surface displacement time series.
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04 September 2022
Article was modified to incorporate some corrections in the reference section.
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Acknowledgements
Thanks to the European Space Agency (ESA) for the Sentinel-1 and Sentinel-2 images, Google Earth for the optical images, National Aeronautics and Space Administration (NASA) and National Mapping Authority (NIMA) for SRTM DEM, Deutsches Zentrum für Luft- und Raumfahrt (DLR) for TanDEM DEM, USGS for the earthquake catalog and China Geological Survey for fault data. The monthly precipitation data was from the Global Precipitation Measurement (GPM, https://gpm.nasa.gov).
Funding
This work was supported by the National Natural Science Foundation of China (41941019). Part of this work was also supported by the Shaanxi Province Science and Technology Innovation team (Ref. 2021TD-51), the Shaanxi Province Geoscience Big Data and Geohazard Prevention Innovation Team (2022), and the Fundamental Research Funds for the Central Universities, CHD (Ref. 300102260301, 300102262902, 300102261108, and 300203211261).
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C. Zhang: InSAR data processing, methodology, result analysis, writing/editing original draft. Z. Li: Concept, supervision, resources, research structure design, result analysis, writing/editing original draft, project administration; C. Yu: Result analysis, reviewing/editing draft; B. Chen, Z. Liu and J. Yang: Field Investigation; M. Ding and J. Peng: Result analysis, reviewing draft.
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The legend of Fig. 1b (http://geocloud.cgs.gov.cn/#/portal/home).
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Zhang, C., Li, Z., Yu, C. et al. An integrated framework for wide-area active landslide detection with InSAR observations and SAR pixel offsets. Landslides 19, 2905–2923 (2022). https://doi.org/10.1007/s10346-022-01954-z
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DOI: https://doi.org/10.1007/s10346-022-01954-z