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中文摘要：
基于ASTER-GDEM数据,利用彩色晕染、密度分割与GIS空间统计分析技术,结合地质资料,通过地形高程、地势起伏度、地表坡度、高程和平均坡度剖面及流域面积-高程积分等手段,对黄河源地区的构造地貌特征进行了初步分析。研究表明,黄河源地区为一NW-SE带状盆地地貌,平均海拔4 473 m,平均起伏度为60 m,平均坡度为9.5°,为高海拔盆地,盆内地势平坦,盆缘山势险峻。黄河源盆地内部（4 200～4 300 m）湖相地层发育,地势略有起伏,为古大湖湖底地貌后经河流改造形成;盆内发育三级阶梯状层状地貌面,高程分别为4 400 m、4 500 m和4 600 m,为古大湖作用形成的三级大型湖积阶地;盆地两侧发育山地地貌,沟壑纵横,为山体隆升、构造剧烈活动和强烈风化剥蚀作用形成。黄河源地区的地貌特征受构造作用控制较为明显：盆地边缘的昆南断裂、布青山山前断裂和巴颜喀拉山前断裂对盆地的展布形态和整体地貌特征具有控制作用;盆内玛多断裂、巴颜河前断裂和麻多—野牛沟断裂破坏了古湖积阶地的层状地貌,控制了盆地内部的地势起伏变化和黄河源区水系的整体展布。黄河源流域地貌整体处于壮年期,为构造活动和水流作用的综合结果。4 200～4 800 m高程范围内的流域面积最大,占总流域的90.6%,为长期内流作用形成的区域平坦的地形,推测为古湖期湖泊作用的结果;盆地两侧的山前地区,构造活动剧烈、风化作用显著,呈现老年期地貌;盆地东南切口为河谷地貌,处于幼年期,由黄河源的地貌发育特征推测黄河源水系为发育较为年轻的水系。
英文摘要：
Based on ASTER-GDEM（30m） data and geological information and adopting color-dye,density-class and GIS spatial analysis technology,the authors studied geomorphologic characteristics of the Yellow River source region by means of topography-elevation analysis,surficial-slope analysis,terrain-section analysis and hypsometric analysis.According to the research results,the Yellow River source region is a NW-SE-trending ribbon basin with an average elevation of 4473m,an average surface rolling of 60m and an average slope of 9.5°,thus belonging to the high-altitude basin.The basin is flat with steep edges.In the basin there are lots of lacustrine strata 4200-4300m in altitude,characterized by slight undulation.The internal basin was once a fossil lake bed and then turned into what it is by fluviation.There are three layered geomorphic surfaces inside the basin 4400m,4500m and 4600m in attitude respectively,which constituted large-size fluvial terraces due to the influence of the fossil lake.There are mountains on the edges of the basin with steep ravines,formed by mountain uplift and drastic tectonic activity as well as strong weathering action.The geomorphologic characteristics of the Yellow River source region were strongly affected by tectonization： Kunlun fracture,Buqingshan piedmont fault,and Bayan Har Mountain piedmont fault on the edges of the basin exerted a controlling influence on the layout and the entire geomorphologic characteristics;Madoi fault,Bayan River fault and Maduo-Buffalo ditch fault within the basin broke the stratified relief of the lacustrine terraces,and played a main role in forming the terrain and the overall layout of the Yellow River source region water system.The region integrally is at its maturity stage and is the comprehensive result of tectonic activity and fluviation action.The largest drainage area is located in the region with the altitude from 4200 to 4800m,occupying 90.6% of the total region.It is a flat terrain formed by long-term internal flow function,which is considered
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