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Brahmbhatt, Rupal
- Monitoring of Moraine-Dammed Lakes: A Remote Sensing-Based Study in the Western Himalaya
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Authors
Affiliations
1 Space Applications Centre (ISRO), Ahmedabad 380 015, IN
2 M. G. Science Institute, Ahmedabad 380 009, IN
1 Space Applications Centre (ISRO), Ahmedabad 380 015, IN
2 M. G. Science Institute, Ahmedabad 380 009, IN
Source
Current Science, Vol 109, No 10 (2015), Pagination: 1843-1849Abstract
Monitoring of lakes in glaciated terrain in the Himalayan region has been recognized as one of the priority areas especially after the Kedarnath disaster. Among all types of glacial lakes, moraine dammed lakes (MDLs) are the most important from disaster point of view. Remote sensing plays a significant role in view of availability of unbiased repeated data on the expansion or contraction of MDLs located in rugged terrains of the Himalaya. Monitoring of two MDLs, associated with Katkar and Gepang-gath glaciers in Zanskar and Chandra sub-basins respectively was done using satellite images of 1965, 1976, 1989, 2001, 2006-07, 2012 and 2014. Survey of India (SOI) topographical maps of 1962 were also referred to monitor the respective glaciers lakes. SOI maps show the presence of only one lake associated with Gepang-gath glacier. Areal extent of the MDLs had increased from 21 to 57 ha between 1965 and 2014, and from 27 to 80 ha between 1962 and 2014 for the Katkar and Gepang-gath glaciers respectively. Increase in peak discharge of the two lakes was also estimated using different empirical models in case of outbursts of these lakes. The lake outburst probability for both these lakes was found to be very low (less than 1%), however, possibility of outburst of lakes due to natural calamity like cloud burst, landslide or earthquake cannot be ignored. The rate of retreat of these two glaciers was observed to be high due to the presence of MDLs in comparison to surrounding glaciers in the valley.Keywords
Glacier, Moraine Dammed Lake, Peak Discharge, Retreat.Full Text
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- Are the Himalayan Glaciers Retreating?
Abstract Views :199 |
PDF Views:92
Authors
I. M. Bahuguna
1,
B. P. Rathore
1,
Rupal Brahmbhatt
2,
Milap Sharma
3,
Sunil Dhar
4,
S. S. Randhawa
5,
Kireet Kumar
6,
Shakil Romshoo
7,
R. D. Shah
2,
R. K. Ganjoo
8,
Ajai
1
Affiliations
1 Space Applications Centre, Ahmedabad 380 015, IN
2 M. G. Science Institute, Ahmedabad 380 009, IN
3 School of Social Sciences, Jawaharlal Nehru University, Delhi 110 067, IN
4 Department of Geology, Government College, Dharamshala 176 215,, IN
5 State Council of Science and Technology, Shimla 171 009, IN
6 G.B. Pant Institute of Himalayan Environment and Development, Almorah 263 643, IN
7 Department of Earth Sciences, University of Kashmir, Srinagar 190 006, IN
8 Department of Geology, Jammu University, Jammu 180 006, IN
1 Space Applications Centre, Ahmedabad 380 015, IN
2 M. G. Science Institute, Ahmedabad 380 009, IN
3 School of Social Sciences, Jawaharlal Nehru University, Delhi 110 067, IN
4 Department of Geology, Government College, Dharamshala 176 215,, IN
5 State Council of Science and Technology, Shimla 171 009, IN
6 G.B. Pant Institute of Himalayan Environment and Development, Almorah 263 643, IN
7 Department of Earth Sciences, University of Kashmir, Srinagar 190 006, IN
8 Department of Geology, Jammu University, Jammu 180 006, IN
Source
Current Science, Vol 106, No 7 (2014), Pagination: 1008-1013Abstract
The Himalayan mountain system to the north of the Indian land mass with arcuate strike of NW-SE for about 2400 km holds one of the largest concentration of glaciers outside the polar regions in its high-altitude regions. Perennial snow and ice-melt from these frozen reservoirs is used in catchments and alluvial plains of the three major Himalayan river systems, i.e. the Indus, Ganga and Brahmaputra for irrigation, hydropower generation, production of bio-resources and fulfilling the domestic water demand. Also, variations in the extent of these glaciers are understood to be a sensitive indicator of climatic variations of the earth system and might have implications on the availability of water resources in the river systems. Therefore, mapping and monitoring of these freshwater resources is required for the planning of water resources and understanding the impact of climatic variations. Thus a study has been carried out to find the change in the extent of Himalayan glaciers during the last decade using IRS LISS III images of 2000/01/02 and 2010/11. Two thousand and eighteen glaciers representing climatically diverse terrains in the Himalaya were mapped and monitored. It includes glaciers of Karakoram, Himachal, Zanskar, Uttarakhand, Nepal and Sikkim regions. Among these, 1752 glaciers (86.8%) were observed having stable fronts (no change in the snout position and area of ablation zone), 248 (12.3%) exhibited retreat and 18 (0.9%) of them exhibited advancement of snout. The net loss in 10,250.68 sq. km area of the 2018 glaciers put together was found to be 20.94 sq. km or 0.2% (±2.5% of 20.94 sq. km).Keywords
Ablation, Glacier, Himalaya, Retreat, Snout.Full Text