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• W2387033190 abstract "The large variation of b value in the power model (y=ax b ) used widely in the analysis of the cross section features of glacial valley causes some uncertainty in determining its morphology. The relationships among the morphologic parameters (a, b, and FR (form ratio defined by Graf (1970) as the width of the glacial valley at the trim-line divided by the valley depth below the trim-line)) become the key issues to the morphology research of the glacial valley. Based on the investigation and observation of glacial valleys in the middle and western Tianshan Mountains and other related researches both in China and in other countries, the relationships among a, b, and FR of the glacial valley cross section are presented and discussed in this paper. The first purpose is to verify the relationship between b and FR (b-FR diagram). Hirano and Aniya (1988) classified it into the Rocky Mountain model and the Patagonia-Antarctica model. The Rocky Mountain model, in whcih bincreases with increasing FR, is available for alpine glacial valleys and depicts an overdeepening development of the glacial valley. The Patagonia-Antarctica model is available for glacial valleys formed by continental ice mass with larger bassociated with smaller FRand reflects a widening process of the glacial valley. However, the b-FR diagram in Tianshan Mountains does not coincide with the Rocky Mountain model. b is dispersive and have a trend of decrease with increasing FR, showing that the widening is larger than the overdeepening in these areas. This indicates that Hirano and Aniya's Rocky Mountain model can not be applied to all alpine glacial areas and can not be used as a criterion to describe the glacial valley geomorphology. Secondly, the relationship between A(A=ln a) and bis studied. Statistics show that the A-b diagram has a closed linear relationship (-A=6.411b-5.886 5) and can fit in with all results up to now both in China and in other countries. This relationship can determine the U-shaped glacial valley morphology essentially and can be used as a criterion to describe the glacial valley geomorphology. In order to provide a rational explanation of it, this linear relationship is analogized with the fluvial hydraulic geometry relations just like Graf did in 1970 and compared the A-b diagram of glacial valleys in the Tianshan Mountains with the fluvial channel cross sections in the middle and lower reaches of the Yangtze River. It is shown that the power model and the A-b linear relationship of glacial valley cross sections can be derived from the hydraulic geometry relations, and the A-b diagram of the fluvial channel cross sections in the middle and lower reaches of the Yangtze River also shows a trend similar to the glacial valleys. However, there is evident distinction between the cross sections of glacial valleys and river channels. The variation of b in the river channel cross section is larger than that of the glacial valley. At the same time, the bottom width of a river channel cross section represented by A is wider than that of a glacial valley evidently. These characteristics can be helpful to differentiate valleys formed by different processes and useful to the research of the alpine glacier dynamics." @default.
• W2387033190 created "2016-06-24" @default.
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• W2387033190 date "2000-01-01" @default.
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• W2387033190 title "Discussion on the Cross Section Features of Glacial Valley" @default.
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