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中文摘要：
基于DEM提取了渭河上游8条支流的Hack剖面、河长坡降指标SL参数以及标准化坡降指标（SL/K）,对该区构造活动进行了分析.结果显示该区河流的Hack剖面皆呈上凸形态,表明第四纪以来位于青藏高原东北缘的渭河上游整体上处于构造抬升状态,且抬升速率较快.同时Hack剖面的凸度有所区别,说明该区构造活动存在着区域差异,其中西秦岭北麓和六盘山南段地区的构造活动较为强烈,而北部的黄土高原构造活动相对较弱.SL参数证实了第四纪以来青藏高原东北缘的西秦岭北缘断裂、六盘山东缘断裂和会宁断裂存在构造活动.
英文摘要：
The stream length-gradient SL index,Hack profile and gradient index（SL/K） were examined forconcavity studies of each profile and analyzed for research into the tectonic activities based on DEM.Themorphology of all hack profiles is convex,which show that the main factor causing the landform is tectonicuplifting in the upper reaches of Weihe river basin.However,the tectonic processes are distinguished in differenttributaries.The tectonic activities are very strong in the western Qinling and Liupanshan mountain areas andweak in the loess region of the northern study area.SL parameters have also proved the activity of westernQinling fault,Liupanshan eastern fault and Huining fault from quaternary.
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