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学科主题: 地球科学::地质学
题名: 基于DEM的青藏高原河流地貌量化分析——以雅鲁藏布江和朋曲为例
作者: 孙杰
答辩日期: 2009
导师: 刘静
专业: 构造地质学
授予单位: 中国科学院研究生院
授予地点: 北京
学位: 硕士
关键词: 数字高程模型 ;  构造地貌 ;  河流纵剖面 ;  数据空洞 ;  河流裂点
索取号: S000018
部门归属: 图书馆
摘要: 河流地貌和侵蚀是构造地貌研究的核心内容之一。青藏高原南部横切喜马拉雅山脉的高原河流记录着高原抬升和气候变化丰富的信息,是高原隆升和造山带形成的一个重要研究研究方向。 90m分辨率的SRTM3数字高程模型广泛的运用于构造地貌学研究,但数据空白区是其在河流地貌定量研究中的瓶颈。本文根据1:25万DEM数据与SRTM3数据的互补性,对SRTM3数据进行优化处理,为青藏高原河流地貌研究提供了准确可靠的数据。本文基于优化处理的SRTM3 DEM数据,对雅鲁藏布江和朋曲流域进行定量地形地貌分析,提取河流纵剖面等河流地貌定量参数,并在得出初步结论。研究发现,青藏高原南部河流纵剖面均呈现上凹形和上凸形的复合体,反映了平坦的高原内部与地势起伏急剧变化的高原边缘。雅鲁藏布江河流裂点不能作为高原阶段抬升的标志,而是受区域构造控制。高原河流宽窄相间的河谷、河床发育、裂点分布等地貌特征都是受高原内部断裂的影响。
英文摘要: Fluvial erosion is among the core components in tectonic geomorphology. The trans-Himalayan rivers in southern Tibet Plateau bear rich information of the plateau uplift and climate change, and has become an important research direction of plateau and orogen uplift. The 90m-resolution SRTM3 DEM has been widely used in tectonic geomorphology, but the data void is the bottle-neck that hampers its application in quantitative fluvial geomorphology. Using the complementary 1:250k DEM to fill the holes in SRTM3 is effective in quantitative studies in fluvial geomorphology, especially in dissected margins of the Tibetan plateau. Based on the void-filled SRTM3 DEM data,this thesis quantitatively analyzed the topography of the Yarlung Zangbo and Arun River and extracted geomorphologic parameters such as river longitudinal profile, and made a preliminary results. Our results show that most rivers in the south Tibetan with their headwaters on the plateau have a stepped or convex-up long profile: flat in the upper reach on the plateau and steep in the middle reach across the plateau edge. The river knickpoints of Yarlung Zangbo River may be caused by the control of partial south-north direction positive faults, but not signs of phased raise of Tibetan Plateau that someone else thinks. We also found that the fluvial geomorphology such as the water system pattern, alternating sections of wide valleys and gorges , river knickpoint, are mainly controlled by the faults in the plateau.
语种: 中文
内容类型: 学位论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/1211
Appears in Collections:图书馆_学位论文

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Recommended Citation:
孙杰.基于DEM的青藏高原河流地貌量化分析——以雅鲁藏布江和朋曲为例[硕士].北京.中国科学院研究生院.2009
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