Slope Stability State Monitoring and Updating of the Outang Landslide, Three Gorges Area with Time Series InSAR Analysis
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摘要: 坡体表面形变是表征坡体稳定性的重要信息，因此，非常有必要对滑坡多发区域进行时序常规变形监测.近年来，星载合成孔径雷达数据由于其覆盖范围大、形变监测精度高的特点，被越来越多的用于山区滑坡识别与探测.首先介绍了联合分布式目标与点目标的时序InSAR方法，并将该方法应用于分析覆盖三峡藕塘滑坡的2007年至2011年的19景ALOS PALSAR数据和2015年至2018年的47景Sentinel-1数据，提取了数据覆盖时间段内的藕塘地区的变形速率.发现相比于2007年至2011年，2015年至2018年新增三处不稳定斜坡.进一步对滑坡的时序变形分析表明，降雨和水位变化是坡体稳定性最大的两个影响因素.实验证明时序InSAR方法可以作为常规形变手段来识别与监测三峡库区等地区潜在的滑坡，为防灾减灾提供支持与依据.Abstract: Slope displacement is the most direct embodiment of slope stability. Thus, it is of great significance to monitor the known landslides and detect the unknown landslides by routine time series displacements of landslide prone areas. Synthetic Aperture Radar (SAR) images with its wide coverage and capability of high presicion displacement monitoring play more and more important roles in landslide identification and detection. In this study, time series InSAR analysis method combining distributed scatterers and point-like targets is introduced. Then, we investigate the stability of the Outang landslide and surrounding slopes with 19 ALOS PALSAR images from 2007 to 2011 and 47 Sentinel-1 images from 2015 to 2018. Three new active slopes were identified with the Sentinel-1 datasets compared with the results from ALOS PALSAR datasets. Time series displacement analysis indicate the rainfall and water level fluctuation seriously affect the stability of slopes in the Three Gorges area. As a result, time series InSAR analysis can be carried out routinely to monitor and detect potential landslides.
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Key words:
- Outang landslide /
- displacement monitoring /
- time series InSAR analysis /
- rainfall /
- water level /
- engineering geology
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图 2 (a) ALOS PALSAR数据干涉图组合；(b) Sentinel-1数据集干涉对组合
圆圈表示影像数据，直线表示干涉图组合
Fig. 2. Interferograms used for time series InSAR analysis ALOS PALSAR (a) and Sentinel-1 (b)
图 3 利用ALOS PALSAR数据集(a)和Sentinel-1数据集(b)获取的平均速率
虚线表示两个数据集共同探测到的滑坡范围，实线表示Sentinel-1数据探测到的滑坡.其中实线方框中为图 5所示位置
Fig. 3. Mean displacement velocity map obtained from ALOS PALSAR datasets (a) and Sentinel-1 dataset (b)
图 5 新发现滑坡示例
a.2010年3月19日Google Earth光学影像；b.2018年4月3日Google Earth光学影像；c.Sentinel-1获取平均形变速率；d.P3点时序形变与降雨和水位
Fig. 5. An example of newly detected landslide
图 4 ALOS PALSAR数据集和Sentinel-1数据集获取的(a)、(c) P1和(b)、(d) P2点形变序列与相应的水位和降雨
Fig. 4. Time series displacements of (a), (c) P1 and (b), (d) P2 from ALOS PALSAR dataset and Sentinel-1 dataset and corre sponding rainfall and water level
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