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Active Landslide Detection Based on Sentinel-1 Data and InSAR Technology in zhouqu county, Gansu Province, Northwest China

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Journal of Earth Science 2021年第5期32卷 1092-1103页

作者： Cong Dai Weile Li Dong Wang Huiyan Lu Qiang Xu Ji Jian State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Earth Sciences Chengdu University of TechnologyChengdu 610059China China Railway Eryuan Engineering Group Co.Ltd. Chengdu 610031China

zhouqu county in Gansu Province, Northwest China, is typically highly prone to landslides. On July 12, 2018, a landslide blocked the Bailong River near zhouqu county, posing a serious threat to the life and property of local residents and the safety of infrastructure. Small baseline subset interferometry synthetic aperture radar technology(SBAS-In SAR) was adopted to identify the potential active landslides in the surrounding area of zhouqu county, using ascending and descending orbit Sentinel-1 satellite images taken from October 2017 to December 2018. The surface deformation areas detected by SBAS-In SAR were verified by optical remote sensing image interpretation and field investigation, and a total of 23 active landslides were identified finally. The deformation characteristics of four typical landslides are analysed in detail using deformation velocity and rainfall data. It is found that the deformation velocity of landslides in this area is mainly affected by rainfall and there is a lag effect. The results can provide a reference for the prevention and control of landslide risk in zhouqu county.

关键词： zhouqu county landslide detection small baseline subset interferometry

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Characteristics, causation, and rehabilitation of zhouqu extraordinarily serious debris flows in 2010, China

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Journal of Central South University 2013年第8期20卷 2342-2348页

作者： WANG Lan-min WU Zhi-jian WANG Ping CHEN Tuo Lanzhou Institute of Seismology China Earthquake Administration Lanzhou 730000 China Key laboratory of Loess Earthquake Engineering (China Earthquake Administration) Lanzhou 730000 China Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province Lanzhou 730000 China State Key Laboratory of Frozen Soil Engineering (Cold and Arid Regions Environmental and Engineering Institute Chinese Academy of Sciences) Lanzhou 730000 China

In early morning of Aug 8th, 2010, the rain-triggered tremendous debris flows broke out simultaneously at the Sanyanyu ravine and Luojiayu ravine, which locate in the north part of zhouqu county town. The debris flow is the most severe event of the same kind of disasters in the past sixty years in China, which caused great losses of people's lives and properties. Based on field investigation, remote sensing image interpretation and analysis of local climatological data, the local topographical conditions, active tectonic movement, massive debris source and torrential rains were the main formation causes which induced the catastrophic debris flows. Moreover, detailed geological surveys were carried out following the disaster, the other geological potential hazard sites were found out, and the geological and seismic hazard assessment has been put into practice. At last, scientific and appropriate countermeasures have been suggested to prevent and mitigate the extraordinarily serious debris flow.

关键词： debris flows hazard assessment geological survey zhouqu county

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