Discussion on the Graduation Character and its Spatial Distribution of Glacial Striae at the Head of Urumqi River

Based on surveying data of glacial striae on roches mountonnees near the terminus of Glacier No.1 and Glacier No.7 at the head of Urumqi River, Tian Shan Mt., the statistical graduation character of glacial striae is discussed in this paper. It is shown that the statistical graduation character of glacial striae conforms to the exponent model, and the parameters (A and B) of this model can be used as indexes to describe the density of glacial striae and the glacial dynamics. The larger A and B are, the larger the density of glacial striae is. The spatial distribution of the parameters (A and B) of glacial striae is influenced by the size of glacier, location in the trough, and position on the roches mountonnee. It is shown in this area that the A and B values are larger in the larger glacier (Glacier No.1) than those in the smaller (Glacier No.7), and larger on the top side of the roches mountonnee than those on the lateral side. At the same time, the A and B values are also varied from the center to the edge in glacial troughs influenced by the micro forms in glacial valleys.