北川地区地震灾害的地形因子分析
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摘要
选取极灾区北川县为研究区,利用数字高程模型(DEM)提取地形因子进行地形信息的定量分析。研究结果显示:坡度40°～50°、坡度变率在18°～30°、地形起伏度为50～70m,甚至更大的地区极易发生地震灾害。
The images before and after earthquake of Beichuan County are compared,based on tectonic background of regional geology,moreover,the various terrain factors including slope,aspect,Plan of curvature,profile curvature,slope rate and so on,are extracted from Digital Elevation Model(DEM),to quantitatively analyze the terrain information.The preliminary result indicates as follows:in Beichuan County,the slope ranges from 40° to 50°,slope change rate is between 18° and 30°,and relief amplitude ranges from 50 m to 70 m,the seismic secondary disasters,such as landslide and barrier lake triggered by landslide in some valley areas are extremely easy to occur in even wider areas.
The images before and after earthquake of Beichuan County are compared,based on tectonic background of regional geology,moreover,the various terrain factors including slope,aspect,Plan of curvature,profile curvature,slope rate and so on,are extracted from Digital Elevation Model(DEM),to quantitatively analyze the terrain information.The preliminary result indicates as follows:in Beichuan County,the slope ranges from 40° to 50°,slope change rate is between 18° and 30°,and relief amplitude ranges from 50 m to 70 m,the seismic secondary disasters,such as landslide and barrier lake triggered by landslide in some valley areas are extremely easy to occur in even wider areas.
引文
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9张国华.江西省瑞昌市地震次生地质灾害特征分析[J].东华理工大学学报(自然科学版),2008,31(2):140-145.9Zhang Guohua.The characteristic analysis of earthquake secondary geological disasters in Ruichang city of Jiangxi province[J].Journal of East China Institute of Technology(Natural Science),2008,31(2):140-145.(in Chinese)
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2国务院关于四川汶川特大地震抗震救灾及灾后恢复重建工作情况的报告[R].2008.2State Council report on post-Wenchuan great earthquake re-lief,rehabilitation and reconstruction,Sichuan Province[R].2008.(in Chinese)
3刘凤民,等.中国地震次生地质灾害危险性评价[J].地质力学学报,2006,12(2):127-131.3Liu Fengmin,et al.Danger assessment of earthquake-in-duced geological disasters in China[J].Journal of Geome-chanics,2006,12(2):127-131.(in Chinese)
4宋光齐.雅江、康定地震次生地质灾害的预防[J].四川地质学报,2002,22(1):35-38.4Song Guangqi.Control on secondary geological hazards de-rived from earthquakes in Yajiang-Kangding region[J].Acta Geologica of Sichuan,2002,22(1):35-38.(in Chinese)
5郭芳芳,杨农,孟晖.地形起伏度和坡度分析在区域滑坡灾害评价中的应用[J].中国地质,2008,35(1):131-142.5Guo Fangfang,Yang Long and Meng Hui.Application of the relief amplitude and slope analysis to regional landslide haz-ard assessments[J].Geology in China,2008,35(1):131-142.(in Chinese)
6张桂芳,单新建,尹京苑.高分辨率卫星影像图在震害快速预估中的应用[J].大地测量与地球动力学,2005,25(2):63-68.6Zhang Guifang,Shan Xinjian and Yin Jingyuan.Application of high-resolution satellite remote sensing image in quick pre-estimate of seismic disaster[J].Journal of Geodesy and Geodynamics,2005,25(2):63-68.(in Chinese)
7邓志辉,陈梅花,王煜.卫星热遥感技术在地震预测中应用研究进展[J]大地测量与地球动力学,2005,25(2):46-51.7Deng Zhihui,Chen Meihua and Wang Yu.Review of apply-ing satellite thermally remote sensing technology to earth-quake prediction[J].Journal of Geodesy and Geodynamics,2005,25(2):46-51.(in Chinese)
8陶和平,等.遥感在重大自然灾害监测中的应用前景——以5.12汶川地震为例[J].山地学报,2008,26(3):276-279.8Tao Heping,et al.Natural hazards monitoring using remote sensing——A case study of5.12Wenchuan earthquake[J].Journal of Mountain Science,2008,26(3):276-279.(in Chinese)
9张国华.江西省瑞昌市地震次生地质灾害特征分析[J].东华理工大学学报(自然科学版),2008,31(2):140-145.9Zhang Guohua.The characteristic analysis of earthquake secondary geological disasters in Ruichang city of Jiangxi province[J].Journal of East China Institute of Technology(Natural Science),2008,31(2):140-145.(in Chinese)
10龚建华,赵忠明.四川汶川地震应急无人机遥感信息获取与应用[J].城市发展研究,2008,15(3):31-33.10Gong Jianhua and Zhao Zhongming.Acquisition and appli-cation of remote sensing information from unmanned plane for emergency in Sichuan Wenchuan earthquake[J].Urban Studies,2008,15(3):31-33.(in Chinese)
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