Slope Deformation Investigation on Typical Debris Flow Gullies of Xiaojiang River Basin Through SBAS-InSAR
Xiaojiang River basin is located at Xiaojiang fault zone, southwest of China. At present, the valley is at a maturity of geomorphic evolution, and there are intense in tectonic activities. Because of soil erosion, rock fragmentation and vegetation degradation, multifarious geo-hazards (e.g. collapse, landslide and debris flow) occur frequently in the valley. SBAS-InSAR is an advanced remote sensing technique that can monitor surface deformation in a wide range, and applicable to the vast majority of geo-hazards investigation. In the article, the surface deformation in Xiaojiang valley was estimated by SBAS-InSAR and 46 descending Sentinel-1 SAR data (from October 2014 to May 2018). It shows that a weak deformation with the velocity from −15 to 5 mm/yr was ubiquitous throughout the valley. Prominent deformation concentration zones were detected in the typical debris flow gullies. The area with the fastest deformation velocity was distributed on the southern landslide of Shawan gully, velocity reaching −120.2405 mm/yr. Slope deformation also occurred in Jiangjia gully, Dabaini gully and Xiaobaini gully with different tendencies.
KeywordsSBAS-InSAR Xiaojiang River basin Slope deformation
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