Changes in the flood plains and water quality along the Himalayan rivers after the Chamoli disaster of 7 February 2021

The Himalayan regions are vulnerable to all kinds of natural hazards. On 7 February 2021, a deadly disaster occurred near the Tapovan, in Uttarakhand, Himalayas. During the event, large volume of debris along with broken glacial fragments flooded the Rishi Ganga River and washed away the nearby hydr...

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Bibliographic Details
Published in:International journal of remote sensing 2021-09, Vol.42 (18), p.6984-7001
Main Authors: Meena, Sansar Raj, Bhuyan, Kushanav, Chauhan, Akshansha, Singh, Ramesh P.
Format: Article
Language:English
Subjects:
Backscattering
Chlorophyll
Chlorophylls
Coefficients
Disasters
Floodplains
Floods
Hydroelectric plants
Hydroelectric power
Hydroelectric power plants
Radar data
Rivers
SAR (radar)
Satellite data
Synthetic aperture radar
Turbidity
Water quality
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Summary:The Himalayan regions are vulnerable to all kinds of natural hazards. On 7 February 2021, a deadly disaster occurred near the Tapovan, in Uttarakhand, Himalayas. During the event, large volume of debris along with broken glacial fragments flooded the Rishi Ganga River and washed away the nearby hydropower plants (Rishi Ganga and Tapovan), which was revealed from detailed analysis of multi spectral and bi-temporal satellite data. We present the impact of the Chamoli disaster on the flood plains and water quality of Himalayan rivers, Rishi Ganga near Tapovan, Alaknanda near Srinagar and Ganga near Haridwar and Bijnor. We used four locations along four sections of Himalayan rivers and have analysed various indices, modified normalized difference water index, normalized difference chlorophyll index, and normalized difference turbidity index, to study the changes in water quality and flood plains. On comparison of the spectral and backscattering coefficients derived from Sentinel-2 optical and Sentinel-1 synthetic aperture radar data, changes in the water quality and flood plains of the rivers were found.
ISSN:0143-1161
1366-5901
DOI:10.1080/01431161.2021.1944696