Identification and time series monitoring of hidden dangers of geological hazards in the typical loess hilly regions

• Published in: Shuiwen Dizhi Gongcheng Dizhi Vol. 50; no. 2; pp. 141 - 149
• Main Authors: Yuling YIN, Suning XU, Jun WANG, Ke HU
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Hydrogeology & Engineering Geology 01-03-2023
• Subjects: identification of hidden dangers; insar technology; loess hilly region; optical remote sensing technology; time series monitoring
• ISSN: 1000-3665
• DOI: 10.16030/j.cnki.issn.1000-3665.202211004

The geomorphology of southern Ningxia is dominated by loess hills, with gullies and well-developed small landslides in the area, making surface deformation monitoring difficult. To explore the identification method of geological hazards in the loess hilly area, Jingyuan district in the city of Guyuan in Ningxia Huizu Zizhiqu is taken as the study area, and the SBAS-InSAR technology is applied to process a total of 11 periods of ascending L-band ALOS-2 data collected from July 2016 to May 2021 to obtain the deformation rate of the Jingyuan district. Combined with high-resolution optical images, a comprehensive analysis is carried out according to factors such as deformation rate, deformation scale, slope, and disaster-bearing body. A total of 27 suspected hidden dangers are identified. After field verification, 22 of them show obvious signs of deformation and have clear hazard-bearing bodies. The time-series deformation analysis of the typical hidden danger points shows that these areas have continuous and sig