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
『東洋文庫所蔵』貴重書デジタルアーカイブ
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| 0632 |
Southern Tibet : vol.7 |
| 南チベット : vol.7 |
引用情報
OCR読み取り結果
always been sufficient for carrying out detailed work in every one of the upper
valleys of the Himalayas. But in the course of years every detail will be filled up.
As it is, the work of the Survey is gigantic and admirable.
It is of great interest to hear that the Gurla Glacier »shows signs of actual
recession at the present time».¹ This was in 1905 and was in perfect harmony
with the fact that the channel between the lakes was dry, although, of course, the
recession of glaciers begins later than the drying up of river beds. The Manasarovar
could easily again overflow whilst the glaciers of the surrounding mountains were
still in recession. On the other hand it is not quite in harmony with the retreat
of the Gurla Glaciers that some passes in Garhwal, which, according to Bhotia tradition,
long ago were easy to pass, now are crossed only with great difficulty.²
Dr. Longstaff comes to the following conclusion:
Such cases may be due merely to local changes in these particular glaciers,
but one cannot help remembering the evidence brought forward by Blanford, Gar-
wood, and others to the effect that the Himalayas are still undergoing a process of
elevation. Such elevation, by arresting an increasing amount of the monsoon water-
vapour, would surely be at least a contributary cause in the desiccation now taking place
in Central Asia, indications of which are evident even in regions so close to the Himalaya
as Mansarowar.³
I have touched upon this problem in a work which was published during my
last absence in Tibet, and I will here content myself with quoting the following
passage about my own views;⁴ speaking of the general desiccation of Tibetan
lakes I say:
Can it be that it is dependent upon a still active elevation of the geologically recent
ranges of the Himalaya, or, as Dr. Ekholm suggests, upon the encroachments which the
peripheral regions are making upon the central regions? That the Himalayan waterdivide
is advancing from the Indian side towards the Tibetan is certain; but considering the
amount of the precipitation, this change can hardly produce any other effect except that
of diminishing to some extent the supplies yielded up to the Indus and the Tsangpo,
without on the other hand influencing the amount of the precipitation in the interior, self-
contained drainage-basins. It is more probable that the desiccation of the Tibetan lakes
is dependent upon more comprehensive climatic alterations, possibly of a periodic character
and affecting perhaps the whole of the Asiatic continent.
It is of course absurd to make the mountain-building forces in the earth's crust
responsible for the greater difficulty in passing the passes in Garhwal at the present
time than two or three hundred years ago. The denudation works fairly parallell
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864
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876
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888
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