| 地震灾区河谷滑坡检测的遥感分析——以北川县滑坡为例 |
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| 引用本文： | 陈莹,孙洪泉,赵祥,唐宏,周廷刚.地震灾区河谷滑坡检测的遥感分析——以北川县滑坡为例[J].自然灾害学报,2011(1). |
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| 作者姓名： | 陈莹 孙洪泉 赵祥 唐宏 周廷刚 |
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| 作者单位： | 西南大学地理科学学院三峡库区生态环境教育部重点实验室;北京师范大学地表过程与资源生态国家重点实验室;北京师范大学减灾与应急管理研究院;重庆市地理空间信息工程技术研究中心; |
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| 基金项目： | 国家863重点项目(2007AA120205,2007AA120306,2008AA121305,2009AA12Z101); 重庆市科委科技项目(CSTC2009CB2015) |
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| 摘 要： | 震区滑坡易堵塞河道形成高危型堰塞湖,一旦坝堤溃决,将释放巨大能量,造成严重的地震次生水灾。本文利用多源遥感数据,旨在研究一种检测河道滑坡的快速有效的方法,迅速判断出滑坡位置,为救援减灾提供重要信息。首先,对于灾前CBERS-02B星CCD数据,通过归一化水体指数(NDWI)来提取灾前水体信息主要为河道;由于灾后震区天气状况恶劣,故采用Radarsat-1SAR数据。利用水体在SAR影像上的特性,经过多次试验后使用阈值法来提取河道范围。再对两幅影像提取结果中的河道区域进行交集运算,检测出河道范围内的变化部分。通过上述方法提取的河道信息较为模糊、零散,这些模糊、零散并非都由滑坡堵塞河道造成,而是受噪声影响,在此对河道交集影像做膨胀处理,达到突出滑坡信息的目的,进而得以提取河道真实堵塞范围。最后进行人机交互判读,提取滑坡区域。实验以四川省北川县滑坡灾害为例,证明了本文方法的高效性与可靠性。
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| 关 键 词： | 滑坡灾害 CBERS-02B Radarsat-1SAR 变化检测 |
Remote sensing detection analysis of valley landslide in earthquake disaster area:a case study of landslides in Beichuan County |
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| CHEN Ying,SUN Hong-quan,ZHAO Xiang,TANG Hong,ZHOU Ting-gang,School of Geographical Sciences,Southwest University,Chongqing ,China,.State Key Laboratory of Earth Surface Processes , Resource Ecology,Beijing Normal University,Beijing ,.Academy of Disaster Reduction , Emergency Management,.Engineering Technology Research Center of Ge....Remote sensing detection analysis of valley landslide in earthquake disaster area:a case study of landslides in Beichuan County[J].Journal of Natural Disasters,2011(1). |
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| Authors: | CHEN Ying SUN Hong-quan ZHAO Xiang TANG Hong ZHOU Ting-gang School of Geographical Sciences Southwest University Chongqing China State Key Laboratory of Earth Surface Processes Resource Ecology Beijing Normal University Beijing Academy of Disaster Reduction Emergency Management Engineering Technology Research Center of Ge |
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| Institution: | CHEN Ying1,SUN Hong-quan2,3,ZHAO Xiang2,TANG Hong2,ZHOU Ting-gang1,4(1.Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education),School of Geographical Sciences,Southwest University,Chongqing 400715,China,2.State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,3.Academy of Disaster Reduction and Emergency Management,4.Engineering Technology Research Center of Ge... |
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| Abstract: | Landslides caused by earthquake are prone to block the river channels,leading to the formation of high-risk barrier lake.With the water line rising,these barrier lakes can be highly dangerous.Once the dam of the barrier lake bursts,it will release enormous energy and cause severe earthquake secondary flood disaster.In this paper,multi-source remote sensing data are employed to investigate a fast and effective way to detect landslides,which block the rivers,and quickly locate those disasters.As a result,this... |
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| Keywords: | landslides disaster CBERS-02B Radarsat-1SAR change detection |
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