Large-Area Landslides Monitoring Using Advanced Multi-Temporal InSAR Technique over the Giant Panda Habitat, Sichuan, China
Large-Area Landslides Monitoring Using Advanced Multi-Temporal InSAR Technique over the Giant Panda Habitat, Sichuan, China
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DOI：
10.3390/rs70708925
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
P. Tang;Fulong Chen;Huadong Guo;B. Tian;Xinyuan Wang;N. Ishwaran
中科院分区：
文献类型：
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作者：
P. Tang;Fulong Chen;Huadong Guo;B. Tian;Xinyuan Wang;N. Ishwaran
中国四川省都江堰市和汶川县附近的地区，包括重要的大熊猫栖息地，受到汶川地震的严重影响。大面积山体滑坡发生，严重威胁人民和大熊猫的生命安全。在本文中，我们报告了一个增强的多时相干涉合成孔径雷达（MTInSAR）的方法来监测潜在的地震后滑坡的发展，通过分析相干散射体（CS）和分布式散射体（DS）点提取的多时相l-波段ALOS/PALSAR数据在一个综合的方式。通过相位优化以及轨道和地形相关相位误差的缓解，推导出研究区域的表面变形：视线（LOS）方向的速率范围为-7至1.5厘米/年。监测到数十处潜在滑坡，主要分布在沿着岷江、龙门山断裂带及其他高海拔地区。这些发现与以前的山体滑坡分布相吻合。国际合成孔径雷达得出的结果表明，以前的一些滑坡仍然活跃;许多不稳定的斜坡已经形成，未来发生大规模破坏的可能性很大。然而，山泥倾泻对大熊猫栖息地的影响，由轻微至中度不等，在未来一段时间内仍会是保育人士关注的问题。
The region near Dujiangyan City and Wenchuan County, Sichuan China, including significant giant panda habitats, was severely impacted by the Wenchuan earthquake. Large-area landslides occurred and seriously threatened the lives of people and giant pandas. In this paper, we report the development of an enhanced multi-temporal interferometric synthetic aperture radar (MTInSAR) methodology to monitor potential post-seismic landslides by analyzing coherent scatterers (CS) and distributed scatterers (DS) points extracted from multi-temporal l-band ALOS/PALSAR data in an integrated manner. Through the integration of phase optimization and mitigation of the orbit and topography-related phase errors, surface deformations in the study area were derived: the rates in the line of sight (LOS) direction ranged from −7 to 1.5 cm/a. Dozens of potential landslides, distributed mainly along the Minjiang River, Longmenshan Fault, and in other the high-altitude areas were detected. These findings matched the distribution of previous landslides. InSAR-derived results demonstrated that some previous landslides were still active; many unstable slopes have developed, and there are significant probabilities of future massive failures. The impact of landslides on the giant panda habitat, however ranged from low to moderate, would continue to be a concern for conservationists for some time in the future.