Investigation of Slow-Moving Artificial Slope Failure with Multi-Temporal InSAR by Combining Persistent and Distributed Scatterers: A Case Study in Northern Taiwan

Remote Sensing

Rou-Fei Chen¹  Chien-Yu Chi²  Chia-Shin Chang²  Hongyu Liang³  Lei Zhang³  Xiaoli Ding³  Kuo-Long Chen⁴  Chi-Shan Wang⁵  Xin Li⁶ 

[1] Department of Geology, Chinese Culture University, Taipei 11114, Taiwan;Department of Geotechnical Engineering CECI Engineering Consultants, Inc., Taipei 243083 Taiwan;Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, China;Freeway Bureau, MOTC, Taipei 243083, Taiwan;Northern Region Branch Office, Freeway Bureau, MOTC, Taipei 243083, Taiwan;State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100049, China;

关键词: artificial slope;    landslide hazards;    multitemporal InSAR (MTInSAR);    phase estimation;   

DOI  :  10.3390/rs12152403

来源: DOAJ

【 摘 要 】

In Taiwan, landslides pose serious threats to local residents and infrastructures each year due to high mountain relief and distinct seasonal precipitation distribution. Interferometric synthetic aperture (InSAR) provides a powerful tool to map terrain motion and characterize the failure mechanism of unstable slopes. However, it is challenging for the conventional InSAR technique to obtain reliable landslide information in mountainous regions because of insufficient coherent measurements and signal confusion caused by vegetation coverage and rugged terrain. In this study, we adopt an optimized multi-temporal InSAR (MTInSAR) approach to analyze the surface displacement of an artificial side slope along Freeway No. 3, where a catastrophic landslide failure occurred on 25 April 2010, in northern Taiwan. To increase the spatial extent of the deformation signal, we integrate information from both persistent scatterers (PSs) and distributed scatterers (DSs). Topographic residual and height-dependent atmospheric delays are corrected by a component-based method and joint model estimation, respectively. The results reveal the existence of slope movement with a rate of about −30 mm/year prior to the landslide failure. Further analysis shows that the temporal behaviors of downslope movement are correlated with local precipitation. The study demonstrates the need to continuously monitor and verify the stability of artificial slopes to prevent and minimize the probability of a similar landslide occurrence in the future.

【 授权许可】

Unknown