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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0476 Southern Tibet : vol.2
南チベット : vol.2
Southern Tibet : vol.2 / 476 ページ(白黒高解像度画像)

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doi: 10.20676/00000263
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of 17.scub.m. a second. The Chaktak-tsangpo had thus now 1cub.m. less water than
12 days earlier at the confluence with the Tsangpo. One would perhaps have
expected more water as the season was approaching the maximum of the activity in
the Tibetan rivers. But, on the other hand, it should be remembered that on the
way from Pasa-guk to the junction the river receives several tributaries, and further,
that the summer of 1907 was very dry and the clear weather nearly constant, so
that the melting of snow and ice did not show any acceleration in the beginning
of May.
A daily period of oscillations could be observed in the water-level. On June
8th, 12.30 P. M. I had a mark fastened near the bank au niveau with the water
level; at 4.30 P. M. the same day the level had fallen 25mm.; at 7 A. M. on
the 9th it stood + 53mm.; 9 A. M. + 33, 10.30 A. M. + 17mm., 1 P. M. — 25mm.,
4 P. M. — 45m.; the river then continued to fall in the evening and perhaps a part
of the night, and rose the next morning. The amplitude cannot be great as the
river comes from a lake, Lapchung-tso, and is to a great extent fed by springs, but
it shows the difference in the rate of melting during day and night in the upper
reaches of some of its tributaries entering below Lapchung-tso.
Pasa-guk is a miserable little place of a few huts and tents and some poor
inhabitants, but still it is a kind of emporium for salt from depressions and lakes on
the northern plateau-land, and later in the summer a market is held here.