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Implication of active structure in the upper reaches of Weihe river basin from stream length-gradient index(SL index)and Hack profile

JI Ya-peng,GAO Hong-shan,PAN Bao-tian,LI Zong-meng,GUAN Dong-sheng,DU Gong-yuan Key Laboratory of Western China’s Environmental Systems with the Ministry of Education,Lanzhou University,Lanzhou 730000,China  
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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