Analysis of the 2003 Varunawat Landslide,Uttarkashi, India using Earth Observation data |
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| Authors: | K Vinod kumar R C Lakhera Tapas R Martha R S Chatterjee A Bhattacharya |
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| Institution: | (1) Geology and Geophysics Division, National Remote Sensing Agency, Balanagar, Hyderabad, 500037, India;(2) Geosciences Division, Indian Institute of Remote Sensing, National Remote Sensing Agency, 4 Kalidas Road, Dehradun, 248001, India;(3) Department of Geology, Presidency College, Kolkata, 700073, India |
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| Abstract: | Mass movements such as landslides in mountainous terrains are natural degradation processes and one of the most important
landscape-building factors. Varunawat Parbat overlooking Uttarkashi town witnessed a series of landslides on 23 September
2003 and the debris slides and rock falls continued for 2 weeks. This landslide complex was triggered due to the incessant
rainfall prior to the event, and its occurrence led to the blockage of the pilgrim route to Gangotri (source of the Ganges
river) and evacuation of thousands of people to safer places. Though there was no loss of lives due to timely evacuation,
heavy losses to the property were reported. High-resolution stereoscopic earth observation data were acquired after the incidence
to study the landslide in detail with emphasis on the cause of the landslide and mode of failure. Areas along the road and
below the Varunawat foothill region are mapped for landslide risk. It was found that the foothill region of the Varunawat
Parbat was highly disturbed by man-made activities and houses are dangerously located below steep slopes. The potential zones
for landslides along with the existing active and old landslides are mapped. These areas are critical and their treatment
with priority is required in order to minimise further landslide occurrences. |
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| Keywords: | Landslide Cause and mode of failure Earth observation data |
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