The Flow of Glaciers in the Khumbu Region : Glaciological Expedition to Nepal, Contribution No. 10

概要

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The results of measurements of the surface velocity of the glaciers in the Khumbu region showed that the surface velocity underwent a seasonal variation in the upper parts of the ablation area of the Khumbu and the Nuptse glaciers, that is, the velocity from May to August was higher than that of the rest of the year. It was found that the surface of the Kongma Glacier moved upward and this strange motion of the ice was discussed. The thickness of the Khumbu and the Nuptse glaciers was estimated using the theory of glacier flow to be 110 m and 70 m, respectively. The discharge of the Khumbu Glacier was also estimated to be 7.5 × 106, 3.4 × 106, 1.6 × 106 and approximately 0 × 106 tons/year at the elevations of 5340 m, 5280 m, 5140 m and 4960 m, respectively. Using these values and measured ablation rate, the increasing rate of the thickness of the Khumbu Glacier was obtained as follows, 1 m/year between 5340 m and 5280 m, 0.3 m/year between 5280 m and 5140 m, and -1.5 m/year between 5140 m and 4960 m. These results indicated that the Khumbu Glacier was not in equilibrium.
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