IIIFカラー高解像度
国立情報学研究所 - ディジタル・シルクロード・プロジェクト
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| IIIFカラー高解像度 |
| Southern Tibet : vol.3 | |
| 南チベット : vol.3 |
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引用情報
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CHAPTER XXXI.
THE THIRD CROSSING.
This line, which starts from Camp 150 on the plain south of Dangra-yum-tso and ends at Camp 168 at the junction of Chaktak-tsangpo and the great Tsangpo, is also a complete crossing of the whole Transhimalayan system. The starting point, on the Targo-tsangpo, is at 4 708 m; the end point, Camp 168, on the Tsangpo is at 4 524 m. As the southern end point of the second crossing is at 4 012 m, where the Dok-chu enters the Tsangpo, this means a fall of more than 500 m of the Tsangpo between the two points, whereas the northern terminals of the two lines are one and the same, Camp 150. The highest point, or the continental water-parting on this line, is Angden-la at 5 643 m. Therefore the rise from Camp 150 to the highest point is 935 m, at a distance of 62,E km in a straight line, or 71,2 km along my road. From the highest point to Camp 168 the fall is 1 119 m at a distance of 12I,2 km in a straight line and 166,7 km along my road.
The season during which this crossing was undertaken was the month of May.
The scree of detritus at the southern foot of Targo-gangri slopes down direct to the left side of the broad and open valley of the Targo-tsangpo ; the blocks and gravel of the scree consist of black phyllite, weathered granite, phyllitic quartz-schist, and, most of all, quartz-porphyry. The scree is pierced by several ravines and watercourses from small glaciers. One ravine was 12 m deep, with vertical sides in gravel and shingle beds. Otherwise the road is good and hard in fine packed gravel, and sometimes crosses grazing-grounds. As one proceeds south-westwards, the panorama of the western side of the Targo massive opens up gradually with its snow-covered peaks and its small glaciers between them; the nevées are small, and some of the glaciers should rather be regarded as apophyses from a mantle-ice, covering the crest. The southern glaciers seem to extend lower down than the northern. The valley Karmuk carries down a little brook from a glacier front; its left side terrace is double, 3 and 2 m high resp. ; the right terrace is single. From the right side the Targo-tsangpo receives here only one small tributary, Gulung.
Näven is a little round depression with a spring and good grass, and surrounded by rolling hills; in their eastern front two lacustrine terraces may be seen; a third terrace which is 7 or 8 m high is fluvial, and bounds the valley of Targo-tsangpo.
37-141741 III.
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