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0080 The Pulse of Asia : vol.1
アジアの鼓動 : vol.1
The Pulse of Asia : vol.1 / 80 ページ(カラー画像)

New!引用情報

doi: 10.20676/00000233
引用形式選択: Chicago | APA | Harvard | IEEE

OCR読み取り結果

River came to be so checked that a small portion of its
superabundant water was detained in a lake. At present
Wular Lake is about twelve miles long north and south
by about six east and west, and, according to Stein, has a
maximum depth of fifteen feet. It is surrounded on all
sides by alluvial deposits, which have been built up in such
a way as to leave at the base of the northern mountains
the faint hollow in which the lake lies. The formation of
the broad dam, so to speak, which holds back the lake,
is due largely to the deposition of alluvial fans by the trib-
utaries which come in from the north and south near
the mouth of the Baramula gorge. In a moister epoch the
forces of erosion would be less active upon the mountain
slopes because of the thicker cover of vegetation; the
streams, though large, would not be very heavily loaded
with detritus, and the tendency would be to cut away the
fans and similar deposits which had previously been laid
down, and to drain the lake. On the advent of a drier
epoch, on the other hand, the forces of erosion would be
more active upon the mountain slopes, and the average size
of the fragments carried away would be greater because of
the diminution in vegetation and in the number of roots
which would hold the soil in place; the streams, especially
the shorter, steeper tributaries, would be not only more
heavily loaded, but also smaller; and the valley bottoms,
with their comparatively gentle slopes, would become areas
of deposition. Where the swifter tributaries joined the
slower main stream, they would tend to build up fans which
the main stream, also diminished in volume and bearing
a greater load, might not be able to remove. Thus the fans