Posts Tagged india himalaya glacier retreat

Burphu Glacier Retreat, Uttar Pradesh, India

Burphu Glacier is in Uttar Pradesh, India draining into the Goriganga River. The Burphu Gad stream enters the Goriganga a short distance upstream of the proposed hydropower project at Bogudiyar. This project is slated at 370 MW, and will have only a minor dam to divert the water from the river for a short distance before running through turbines and returning to the river. The map of the area is a 1940′s era map with the terminus of the Burphu Glacier indicated by the yellow arrow.burphu map

Here we examine Google Earth imagery and Landsat imagery from 2000-2013 to identify more recent changes. The Burphu Glacier has a substantial accumulation zone above 5000 m, before the glacier narrows and flows through an icefall descending to 4300 m where the glacier reaches the main valley and turns southwest, yellow arrow indicates map terminus, red arrow 2012 terminus. In the 2000 Landsat image the blue ice tongue of the Burphu Glacier reaches the main valley at the westward turn where debris cover than dominates, red arrow. By 2013 the Landsat image indicates the blue ice tongue no longer reaches the main valley, red arrow. In 2012 the Google Earth image illustrates an area of bare rock at 4400 m at the red arrow indicating that the Burphu Glacier terminates above the main valley as suggested by the Landsat 2013 image, though some relict ice remains in the main valley below. An even closer view indicates that the other tributary to the main valley tongue of the Burphu Glacier no longer reaches it either, pink arrow. Thus, this area with some pockets of relict glacier ice buried under debris cover is now fully detached. The total glacier retreat from the 1940′s mapped terminus to 2012 is 2800 meters. The retreat from 2000-2012 is at least meters 250 m as this the distance from the relict main valley ice to the current terminus. The retreat of this glacier is very similar to that of the nearby Kalabaland Glacier and is following the pattern of Malana Glacier, Milam Glacier and Satopanth Glacier in this region. burphu overview
Google Earth overview 2012

burphu 2000
2000 Landsat Image

burphu 2013
2013 Landsat Image

burphu 2012
2012 Google Earth view

burphu closeup

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Milam Glacier Retreat, India

Milam Glacier flows south from the summit of Trisul in the Indian Himalaya. The glacier is fed by a number of tributaries flowing off the north ridge of Nanda Devi as well. A recent paper by Raj (2011) documents the retreat of this glacier from 1954-2006. In the October 16, 2011 satellite image below, the snowline is at 5100 meters (black arrows) and the terminus at 3600 meters (red arrow). The accumulation zone stretches from the icefall regions at 5000-5200 meters to near the summit of Trisul at 7000 meters. From 1954-1976 Milam Glacier retreated at 20 Meters/year, 440 m. From 1976 to 1990 retreat was still 20 meters/year, 290 m. From 1990-2006 the glacier retreated 40 meters/year, 600 meters. The image below is from the Raj (2011) paper. From 2006-2011 the glacier retreated 120 meters (Raj, 2012) The Milam Glacier feeds the Gori Ganga River where a 370 MW hydropower system is anticipated to be built, the system will be a run of the river hydro project. A closeup view from Google Earth imagery of the terminus indicates its stagnant nature and the location of the glacier outlet stream emerging from the under the glacier is a good marker of the terminus, note arrow in top image below. A comparison of 2004 (middle) and 2009 (bottom) indicate the stagnant debris covered nature of the glacier terminus area. A new lake has developed upglacier of the terminus at Point A after 2004. The lake beyond the terminus at Point C has expanded. The terminus where the stream issues from under the glacier is at Point B. The glacier is fed by a number of tributaries that now barely reach and contribute little in the way of volume to the Milam Glacier. These are labelled in the base map from Raj (2011). A closeup example is the Pachmi Drachnu Glacier. The red arrow points out the lateral moraine that now is 100 meters above the current Milam and Pachmi Drachnu Glacier surface. The blue arrow indicates the meager ice supply reaching the Milam Glacier . The Milam Glacier is a summer accumulation type glacier receiving the bulk of its melt and accumulation during the summer monsoon season. This type of glacier is not sensitive to black carbon ablation enhancement as the lower section is debris covered and the upper section covered by frequent new summer snowfall. The retreat of this glacier is similar to that of neighboring glaciers such as the Parbati Glacier, Gangotri Glacier and Satopanth Glacier

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