Moraine-Dammed Lakes study in the chenab and The Satluj River Basins using IRS data |
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| Authors: | S S Randhawa R K Sood B P Rathore A V Kulkarni |
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| Institution: | 1. Himachal Pradesh Remote Sensing Cell, 171 009, Shimla
2. Space Applications Center, 380 015, Ahmedabad
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| Abstract: | Moraine-dammed lakes are normally formed near glacier terminus. These lakes can burst due to excessive melting and can cause
floods in the valleys. Many such floods have been reported in the Himalayas and other parts of the World. In this paper, an
inventory of these lakes in the Satluj and the Chenab basins has been reported. During the investigation, 22 lakes in the
Satluj and 31 lakes in the Chenab basin were mapped. In the Chenab basin, two lakes are of very large size, their areal extent
is 105 and 55 ha, located in toposheet number 52 HI 1 and 52H02, respectively. These lakes were selected for detail monitoring.
The lake near the Geepang glacier, is located in toposheet number 52H 02 and its area was 27 ha in 1976. Using the satellite
data, areal extent of the lake was monitored. The lake area was almost doubled to 55 ha in 2001. This suggested that, lake
size is constantly increasing and it can cause outburst flood. The maximum possible depth of lake was estimated by taking
the average difference of maximum and minimum height of moraine dam from the Survey of India toposheet. By considering the
average depth, the volume of the lake water and the instantaneous discharge of 350 mVsec were estimated. This is large discharge
for a small stream like the Geepang Gath and it can damage many civilian and defense establishments. Therefore, further detail
field investigations of this lake are needed to assess threat potential and to develop strategy to avoid this flash flood. |
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