| 西藏雅鲁藏布江大拐弯地区量化地貌特征及其成因 |
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| 引用本文： | 张沛全,高明星,雷永良,刘小汉.西藏雅鲁藏布江大拐弯地区量化地貌特征及其成因[J].地球科学,2009(4). |
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| 作者姓名： | 张沛全 高明星 雷永良 刘小汉 |
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| 作者单位： | 中国科学院青藏高原研究所;中国地质大学地球科学与资源学院;中国石油勘探开发研究院;中国石油天然气股份有限公司盆地构造与油气成藏重点实验室; |
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| 基金项目： | 中科院知识创新工程重要方向项目(No.kzcx3-sw-143) |
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| 摘 要： | 以数字高程分析、实地地貌调查及沉积物年代学为手段,开展了西藏雅鲁藏布江大拐弯地区地貌特征及其成因研究,采用SRTM-DEM数据对地貌进行了量化分析.区域地貌总体特征为高海拔、高起伏、平山顶(北区).在ArcGIS平台中运用条带法获得该区的最大高程-平均高程-最小高程剖面,剖面特征显示最大高程控制平均高程;利用最大和最小高程剖面定量计算各地质单元的水系下切深度.实地调查及年代学研究发现该地区河谷沉积物以晚更新世以来的冰碛物和冰湖相沉积物为主.结果表明,在雅鲁藏布江大拐弯地区地貌演化过程中,高山冰雪作用是地貌"削高"、"去顶"的重要外动力因素,也是有助于"修平"山顶并形成齐一峰顶面的参与因素;流水"切割"和"搬运"作用是形成地表高起伏的重要原因;外流水系大大削弱了地貌"填低"作用,也是导致河谷山谷沉积物年轻化的原因.
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| 关 键 词： | 数字高程剖面 水系下切 冰川作用 地貌 雅鲁藏布江大拐弯 |
Quantitative Terrain Analysis of the Great Canyon Region of Yalungzangbo River,Tibet and Discussion of Its Origin |
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| ZHANG Pei-quan,GAO Ming-xing,LEI Yong-liang,LIU Xiao-han.Quantitative Terrain Analysis of the Great Canyon Region of Yalungzangbo River,Tibet and Discussion of Its Origin[J].Earth Science-Journal of China University of Geosciences,2009(4). |
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| Authors: | ZHANG Pei-quan GAO Ming-xing LEI Yong-liang LIU Xiao-han |
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| Institution: | ZHANG Pei-quan1,GAO Ming-xing2,LEI Yong-liang3,LIU Xiao-han1 1.Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085 2.School of Earth Sciences , Resources,China University of Geosciences,Beijing 100083 3.Key Laboratory of Basin Structure , Petroleum Accumulation,Institute of Petroleum Exploration , Development,PetroChina,Beijing 100083,China |
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| Abstract: | In this paper,we take new SRTM-DEM data for digital elevation analysis,field surveying and chronology of sediments as means to study topographic features and its origin in the great canyon region of Yalung Zangbo River in Tibet.The new SRTM-DEM data are used for quantitative analysis for terrain.The overall geomorphic features are the high-altitude,high-relief and flat peaks(North).ArcGIS software,an analysis platform,is used to obtain statistics for Maximum-Mean-Minimum elevation profiles from a strip area... |
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