Assessment of daily Streamflow, Sediment fluxes, and Erosion rate of a pro-glacial stream basin, Central Himalaya, Uttarakhand.

Reliable information of hydrological processes within a river basin is essentially required for developing an appropriate strategy for achieving sustainable development goals. The present study assesses the streamflow of a pro-glacial stream and also intends to estimate the contribution of suspended sediments, erosion rate, and the headwater contribution of the Panchachuli glacier. A field study during ablation period has been carried out to measure streamflow, Suspended Sediment Concentration (SSC) and further HBV model has been used for the estimation of the snowmelt. The measured average seasonal streamflow and SSC for the basin were 7.17 m 3 /s, 1.52 g/l, and 6.84 m 3 /s, 1.21 g/l during the gauging period (July to October) for the year 2018 and 2019. Snowmelt contribution in total streamflow was 54.75% which is reduced to 49.16% in 2019. Similarly, glacier melt contributes to 32.62% of its share in total runoff in 2018. This glacier melt contribution again was reduced to 28.73 % in 2019. The rainfall runoff contributes to 12.62% of its share in total runoff during 2018 and 2019. Rainfall runoff showed increased share of 22.13% in its total runoff contribution. The streamflow, SSC, and Suspended Sediment Load (SSL) show a strong positive correlation for both years. The SSY, SSL, and erosion rate of the basin are found as high as compared to the other Himalayan basins situated in Himachal Pradesh, Kashmir, and Ladakh, and non-Himalayan regions, while founded as low when compared to the glaciers presented in the Uttarakhand.