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《Journal of Glaciology and Geocryology》 1989-03
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Research on Glacial Erosional Landforms: Case Study of Luojishan Mt. Western Sichuan

Liu Gengnian (Geography Deportment of Beijing University)  
It is a very useful method to study glacial erosional Landforms, by quantitatively analysing the forms, aspects and altituds of the cirques. In Luojishan Mt. area, there were four factors that influenced the forms of the cirques: (i) more maritime climate, because cloudiress, reduces summer ablation; (ii) on northward (poleward) aspects, because lower temperature and solar radiation protect glaciers from ablation; (iii) on eastward aspects, because ablation of east slope is reduced during the moraing; (iv) higher relief, which provide favourable shelter and shade for glaciers. . Here, the cross section shape of the trough valleys can be formularized as : y = a xh. Calculations show that b changes from 1.306 to 2.000, and a changes from 0.25 to 0.60. In same trough valley, unsymmetry form of the cross section is due to the differential. strenght of glacial erosion and of differential freeze-thaw conditions on both sides of trough valley. It is noticeable that there are four huge grooves found in Qingshuigou trough valley. Their axis always coincides with the ice flow and parallels to the rock bed. Based on the features of the fraction cracks, it is found that there are two groups of cracks which belongs to press-shear fractures and tensile-shear fractures (tension cracks) respectively.
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7 Wang Qing;Sun Hongyan;Ren Jianwu;Yi Xianjin;Cheng Jie;School of Earth Sciences and Resources,China University of Geosciences (Beijing);;Climatic change during the late stage of Late Pleistocene at Muli area in south slope of Qilian Mountains[J];Journal of Palaeogeography;2015-03
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