| 基于GIS与确定性系数分析方法的汶川地震滑坡易发性评价 |
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| 引用本文： | 许 冲 戴福初姚,鑫 赵 洲 肖建章.基于GIS与确定性系数分析方法的汶川地震滑坡易发性评价[J].力学学报,2010,18(1):15. |
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| 作者姓名： | 许 冲 戴福初姚 鑫 赵 洲 肖建章 |
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| 作者单位： | 京航空航天大学航空科学与工程学院 中国科学院力学研究所LNM 北京航空航天大学交通科学与工程学院 |
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| 摘 要： | 鱼类经常采用垂直流向的摆动进行游动, 这种摆动可以用行进波来表示. 应用浸入边界方法模拟了低雷诺数条件下水翼NACA65-010在水中摆动时的流场，并研究了雷诺数对水生动物推进效率的影响. 结果表明：随着雷诺数的增大，推力系数和推进效率增大，而功率系数减小；在Re<20时，推力系数，推进效率和功率系数的变化尤为剧烈. 随雷诺数增加，由于水翼摆动诱导的流场变化也更加复杂，水翼后缘处的涡量场强度逐渐增强. 摆动诱导反卡门涡街产生推力.
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| 关 键 词： | />汶川地震 滑 坡 确定性系数法 易发性评价 GIS |
| 收稿时间： | 2008-09-18 |
| 修稿时间： | 2009-01-13 |
GIS PLATFORM AND CERTAINTY FACTOR ANALYSIS METHOD BASED WENCHUAN EARTHQUAKE INDUCED LANDSLIDE SUSCEPTIBILITY EVALUATION |
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| XU Chong DAI Fuchu YAO XinZHAO Zhou XIAO Jianzhang.GIS PLATFORM AND CERTAINTY FACTOR ANALYSIS METHOD BASED WENCHUAN EARTHQUAKE INDUCED LANDSLIDE SUSCEPTIBILITY EVALUATION[J].chinese journal of theoretical and applied mechanics,2010,18(1):15. |
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| Authors: | XU Chong DAI Fuchu YAO XinZHAO Zhou XIAO Jianzhang |
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| Institution: | Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029）
（Graduate University of the Chinese Academy of Sciences,Beijing 100049）
（Key Laboratory of Neotectonic and Geohazard,Ministry of Land and Resources,Beijing 100081）
（Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081）
（College of Geology and Environment,Xian University of Science and Technology,Xian 710054） |
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| Abstract: | At 14：28(Beijing time)of May 12, 2008,a catastrophic earthquake with surface wave magnitude of 80 struck Sichuan province of China. Tens of thousands of landslides were triggered by this earthquake over a broad area. A total of 48007 landslides were interpreted from aerial photographs and multi source remote sensing imageries,verified by field check. A spatial database,including landslides and associated controlling parameters which may have influence on the occurrence of landslides,was developed and analyzed using geographical information system(GIS)technology. The eight factors that influence landslide occurrence,including seismic intensity,lithology,slope angle,faults,elevation,slope aspect,drainages and roads were created in raster data format base on GIS platform. The landslide susceptibility index of all ranks in each impact factor was calculated,using the certainty factor analysis method. Earthquake induced landslide susceptibility areas of 16 impact factor combination categories were analyzed and mapped one after another,using the GIS raster analysis methods. The susceptibility result of the highest AUC(Area Under Curve)was used to create susceptibility map by using Natural Breaks law. The resulting susceptibility map showed five classes of landslide susceptibility,ie.〖KG-*5〗,extremely high,high,moderate,low,and extremely low. The validation results showed satisfactory agreement between the susceptibility map and the existing data on landslide distributions. The area with extremely high and high susceptibility accounts for about 1169046 km2, 2402% of the study area,includes landslide areas of 52484 km2, 7373% of all landslide areas. The susceptibility success accuracy was up to 82107% in the form of AUC． |
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| Keywords: | Wenchuan earthquake Landslide Certainty factor method Susceptibility assessment Geographic Information Systems |
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