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.7 | |
| 南チベット : vol.7 |
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引用情報
500 THE SELF-CONTAINED BASINS OF TIBET.
and others in the next depression to the south, have a mean altitude of 4956 m. Calculating from 9 lakes of the central plateau-land the altitude of which is known, we get a mean altitude of 4938 m.
The next line of lakes is interesting. In my list I have entered only Panggong-tso, Dagtse-tso and Selling-tso. Adding seven other lakes, not entered in the list we get the following series :
Panggong-tso 43 17 m. Dshuvu-tsagga . . . . 4572 m.
Dshölu-chuga 4392 » Lakkor-tso 4600 »
Tsolla-ring-tso 4440 » Tongka-tso 4500 »
Jim-tso 4495 » Dagtse-tso 4544 »
Oman-tso 4507 » Selling-tso 4611 »
The mean altitude of these lakes is only 4498 m.! And as a rule the absolute altitude gradually increases from west to east, which, on this line at least, contradicts the previous conclusion that the western lakes should be higher than the eastern.
Considering finally the I o Transhimalayan lakes of the list, we find that their mean altitude amounts to 4738 m. We have therefore a depression, Panggong-tsoSelling-tso, in the interior of Tibet that is no less than 44o m. lower than the average height of the depressions north of it and 24o m. lower than the depression of the Transhimalayan lakes. To this curious folding-trough as well as to the other depressions we shall return in a subsequent chapter.
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