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 event, large volume debris along with broken glacial fragments flooded Rishi Ganga River and washed away nearby hydropower plants (Rishi Tapovan), which was revealed from detailed analysis multi spectral bi-temporal satellite data. We present impact Chamoli on flood plains water quality rivers, Alaknanda Srinagar Haridwar Bijnor. used four locations sections rivers have analysed various indices, modified normalized difference index, chlorophyll turbidity study changes plains. comparison backscattering coefficients derived Sentinel-2 optical Sentinel-1 synthetic aperture radar data, were found.