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

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题名:	Investigation of Slow-Moving Artificial Slope Failure with Multi-Temporal InSAR by Combining Persistent and Distributed Scatterers: A Case Study in Northern Taiwan
作者:	Liang, HY (Liang, Hongyu) Li, X (Li, Xin) Zhang, L (Zhang, Lei) Chen, RF (Chen, Rou-Fei) Ding, XL (Ding, Xiaoli) Chen, KL (Chen, Kuo-Long) Wang, CS (Wang, Chi-Shan) Chang, CS (Chang, Chia-Shin) Chi, CY (Chi, Chien-Yu)
贡献者:	地質系
关键词:	artificial slope landslide hazards multitemporal InSAR (MTInSAR) phase estimation
日期:	2020-08
上传时间:	2020-10-28 09:43:12 (UTC+8)
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.
關聯:	REMOTE SENSING 卷冊: 12 期: 15 文獻號碼: 2403
显示于类别:	[Department of Geology] journal articles

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