Persistent Scatterers Interferometry Provides Insight on Slope Deformations and Landslide Activity in the Mountains of Zhouqu, Gansu, China
Persistent Scatterers Interferometry Provides Insight on Slope Deformations and Landslide Activity in the Mountains of Zhouqu, Gansu, China
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DOI：
10.1007/978-3-319-05050-8_56
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
J. Wasowski;F. Bovenga;T. Dijkstra;Xing-min Meng;R. Nutricato;M. Chiaradia
中科院分区：
文献类型：
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作者：
J. Wasowski;F. Bovenga;T. Dijkstra;Xing-min Meng;R. Nutricato;M. Chiaradia
我们给出了持续散射干涉法(PSI)在甘肃南部偏远高山地区斜坡失稳研究的结果，该地区是7-8级大地震和灾难性斜坡破坏的易发区。对高分辨率(~3m)COSMO/SkyMed(CSK)卫星图像的PSI处理产生了关于舟曲地区地表位移的空间密集信息(超过1000ps/km2)，舟曲是白龙江流域的一个小镇。相当部分的雷达目标显示出显著的位移(从几毫米/年到超过50毫米/年)，这表明斜坡不稳定的情况普遍存在。特别是，PSI的结果提供了关于一些非常大的、显然缓慢的山体滑坡活动的宝贵信息，这些山体滑坡对当地人口和基础设施构成持续的危险。监测大型长期山体滑坡的移动非常重要，尤其是在白龙河谷的情况下，已知这些山体滑坡会经历活动增加的时期，导致河流筑坝和灾难性的洪水泛滥。由于普遍缺乏关于舟曲大型山体滑坡和甘肃南部常见的其他类似重大破坏的监测数据，PSI得出的位移提供了独特的信息，根据专家的判断，这些信息可用于与滑坡活动有关的大范围灾害的初步评估。此外，这项研究表明，由于CSK数据的高分辨率导致了高雷达目标密度，PSI还可以帮助进行斜坡/滑坡的特定评估。
We present the results of Persistent Scatterers Interferometry (PSI) applied to investigate slope instabilities in a remote high mountain region of Southern Gansu, known to be prone to large magnitude (M7-8) earthquakes and catastrophic slope failures. The PSI processing of high resolution (~3 m) COSMO/SkyMed (CSK) satellite images produced spatially dense information (more than 1,000 PS/km2) on ground surface displacements in the area of Zhouqu, a town located in the Bailong River valley. A substantial portion of the radar targets showed significant displacements (from few to over 50 mm/year), denoting widespread occurrence of slope instabilities. In particular, the PSI results provided valuable information on the activity of some very large, apparently slow landslides that represent a persistent hazard to the local population and infrastructure. Monitoring movements of large long-lived landslides is important especially when, as in the case of the Bailong valley, they are known to undergo periods of increased activity resulting in river damming and disastrous flooding. Given the general lack of monitoring data on large landslides at Zhouqu and on other similar major failures that are common in Southern Gansu, the PSI-derived displacements offer unique information, which, following expert judgment, can be used for preliminary wide-area assessments of hazards linked to landslide activity. Furthermore, this study shows that with the high resolution CSK data resulting in high radar target density, PSI can also assist in slope/landslide-specific assessments.