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.4 | |
| 南チベット : vol.4 |
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引用情報
`I OROGRAPHY OF CENTRAL TRANSHIMALAYA.
335
Panorama 133, Tab. 24, is taken from a secondary threshold situated some three kilometers W. N. W. of the pass and at a height of 5,434 m. It unrolls to
the S. W. and W. S. W. mountains belonging to the Pabla Range, and to the south hills belonging to the next range, the one of Shib-la. To the S. S. W., in the foreground, we have the deep-cut valley of the Sangra pale, which joins the Sela valley, also visible on the sketch, nearly due south.
On 7anuary 29/h, we travelled 15.8 km. S. S. E. in the valley of the Sele-nang which is a northern or right tributary to the river of the Sela valley. The latter
is no doubt in its lower course identical with the Ke-tsangpo, a tributary to the
Miu-chu, a northern tributary to the great Tsang-po. Camp CXVIII is situated at Selin-do, near the first confluence, and at an altitude of 4,832 m. On this section
the Sele-nang valley thus descends 393 m. or as 1 : 40.2 showing more accentuated gradients on the southern side of the range, 1. e. as soon as we reach the peripheric regions with an outflow to the ocean.
The orographical construction round Camp CX VIII in the valley Selin - do appears from Panorama 130, Tab. 24, where considerable erosion terraces remain as
monuments of an epoch with heavy precipitation. To the S. E. is the entrance to the valley of Porung by which we continued south-eastwards to the crest of the next range, that of Shib-la. S. I I° E. is a mountain group we left to our right. To the S. W. is the Sela valley going down to the junction with the Mü-chu River, which I followed on my second crossing.
Too little is known of the orography of the Central Transhimalaya for
allowing us to draw any conclusions as to the stretching of the great continental
water-parting especially to the east of Sela-la. I have been able only to follow its
principal points on my maps. Thus, for instance, I have the impression that the Chang-la-Pod-la is situated in another range than the Sela-la, viz. the one which we crossed in the pass Shib-la, and it is well known from many other regions that
water-partings often run over from one range to another. Further I believe that the
Pabla Range west of the Sela Pass runs to the W. N. W., N. W. and north, forming a secondary watershed between the two rivers of Targo-tsangpo and Tagrak-
tsangpo and between Dangra-yum-tso and Ngangtse-tso. Such problems cannot be solved in detail by the first pioneer whose view does not reach very far from the sides of his own route. Here is work in the future for many generations of explorers.
The next pass on our way to the S. E. was crossed on 7anuary 3 0th. Shib-la had an altitude of 5,349 m. or 517 m. above the preceding camp, being a rate of
ascent of 1: 38.7, as the distance amounted to 20 km. Camp CXIX at Tagar-ogma was at a height of 4,998 m. or 35 I m. below the pass. The distance from the Shib-la to the camp being 3.8 km. S. W. the rate is I : 10.8. Here again the slope on the southern side is much steeper than on the northern.
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