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《Arid Land Geography》 2006-01
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Analysis on the geomorphic information entropies and the evolution of the Qilian Mountains

SUN Ran-hao1,2,PAN Bao-tian2,WANG Yi-xiang2(1 State Key Lab of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;2 Key Laboratory of Western China’s Environmental Systems,Ministry of Education & College of Resources and Environment Sciences,Lanzhou University,Lanzhou 730000,Gansu,China)  
Analysis on the geomorphic evolution is a principal theoretical proposition in lucubrating geographical issues,from a view point of system,geomorphic information entropy is a helpful index for lucubrating geographical issues.The average elevation of the Qilian Mountains varies in a range of 4 000~5000 m a.s.l.,and the elevation of many peaks is over 5 000 m.The mountainous regions above 4100 m are perennially covered by snow,many modern glaciers are developed,and many rivers rise there.The areas of the gentle-sloped(10o) regions and steep-sloped(30o) regions occupy 40.52% and 11.33 % respectively.In the Qilian Mountains,there are two planation surfaces and one erosion surface,i.e.,the mountaintop surface,main planation surface and erosion surface,which are regarded as the direct indications of episodic and dramatic uplifts of mountains,therefore they have the important significance for inferring the ages of mountain uplifts.Based on the data of vector topographic map,in this paper the geomorphologic evolution stages of 14 drainage basins in the Qilian Mountains are studied with aid of ArcGIS and ArcView.According to the altitude of the planation surface in the Qilian Mountains,we derive the respective geomorphic information entropies and the different Strahler integral curves of the three segments of the drainage basins.The average geomorphic information entropies of the regions vary in a range 0.13~0.39,most of the entropies above the main planation surface exceed 0.4,and the entropies under the main planation surface are all less than 0.2.The geomorphic information entropies reveal that the study areas are undergoing a transition from old stage to young stage of geomorphologic evolution.
【Fund】: 国家自然基金项目(40571010)资助
【CateGory Index】: P931
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