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Spatio-temporal analysis of glacier surface velocity in dhauliganga basin using geo-spatial techniques

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Abstract

Glacier velocity is one of the significant parameter for the assessment of the glacier dynamics, which directly signifies the response of the glacier health with the respect to climate change. The present work focuses on analysing the spatio-temporal characteristics of the surface velocity in the Dhauliganga basin for seven glaciers. The cross-correlation method was applied on the panchromatic scenes of Landsat-7 Enhanced Thematic Mapper Plus (ETM +), Landsat-8 Operational Land Imager (OLI) and Sentinel-2A Multispectral Instrument (MSI) sensors to estimate the velocity. The mean velocity of the seven glaciers along the central flow line ranges from 59.57 to 5.34 m/year while the average of mean velocity ranges from 30.82 to 11.04 m/year during 1993–2018. Whereas, across the flow line, mean velocity ranges from 63.58 to 4.74 m/year. The lowest velocity was observed in the T1–T2 locations near the snout, where the velocity highly dominated by mass loss and debris cover; the error in velocity estimation ranges from ± 3.67 to ± 4.57 m/year. Decreasing trend of surface velocity was observed for all the glaciers. The present work demonstrates the application of cross-correlation technique to monitor the dynamics of a group of glaciers on a basin scale having similar climatic setting. The velocity profiles of various glaciers can be used as input to methods estimating ice thickness and volume and to prioritize the glaciers in view of glacier-dynamics linked events such as surges and retreat induced to rise to pro-glacial lakes and glacier melt contribution to the river flows.

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Acknowledgements

The study is a part of PhD programme of Department of Geography, Hemvati Nandan Bahuguna Garhwal University (HNBGU) and in collaboration with Water Resources Department, Indian Institute of Remote Sensing (IIRS-ISRO), Dehradun, India. Author is grateful to the Supervisors and acknowledged for the technical and overall support in the study. We thankful to United States Geological Survey for provision of the Landsat and Sentinel datasets through Earth Explorer. We, also grateful to the Water Resources Department of IIRSISRO, Dehradun for providing lab facilities like software and other technical requirements.

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Correspondence to Dhanendra K. Singh.

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Singh, D.K., Thakur, P.K., Naithani, B.P. et al. Spatio-temporal analysis of glacier surface velocity in dhauliganga basin using geo-spatial techniques. Environ Earth Sci 80, 11 (2021). https://doi.org/10.1007/s12665-020-09283-x

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  • DOI: https://doi.org/10.1007/s12665-020-09283-x

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