Application of insar technology for landslide hazard identification and multi-dimensional deformation analysis in the Yellow River Basin

Abstract

Qinghai Province is located in the northeastern part of the Qinghai-Xizang Plateau. Frequently affected by geological and climatic factors, landslides along the Yellow River often developed. SBAS-InSAR technology was used to obtain surface deformation information of the Yellow River section in Maqin County, Qinghai Province, from January 2019 to October 2023, using Sentinel-1 data, and visual analysis was conducted to assist in identifying potential geohazards. In addition, two-dimensional deformation result were obtained using ascending and descending tracks, and the Jungong landslide was monitored using two-dimensional monitoring analysis. Based on this, the surface parallel flow constraint model was introduced to perform three-dimensional deformation inversion study on the Xiuma town landslide. The research result show that: based on the InSAR deformation rate, 65 and 46 deformation areas were identified using ascending and descending tracks respectively, for a total of 82 deformation areas, and the combined ascending and descending tracks achieved good visibility in the study area and eliminated the influence of geometric distortion on the result. The two-dimensional deformation result show that the maximum east-west and north-south deformation rates are-50 mm/a and 88 mm/a, respectively, which can assist in analyzing the deformation characteristics of landslides; The two-dimensional deformation of the Jungong landslide shows that 2~# deformed strongly, affected by human engineering activities and rainfall, with a vertical deformation of-175 mm; The three-dimensional deformation reveals the movement direction of different parts of the landslide in Xiuma town landslide. The horizontal sliding direction of the slope is affected by the micro-geomorphology, mainly southward and deviation into the trench, accompanied by subsidence. The time series result show that the landslide is obviously affected by rainfall, and periodic deformation characteristics are observed in local area.

Keywords

Yellow River / geohazards identification / InSAR / MSBAS / multidimensional deformation inversion