Insights on the Impacts of Hydroclimatic Extremes and Anthropogenic Activities on Sediment Yield of a River Basin

Streamflow and sediment flux variations in a mountain river basin directly affect the downstream biodiversity ecological processes. Precipitation is expected to be one of main drivers these Himalayas. However, such relations have not been explored for basin, Nepal. This paper explores variation streamflow from 2006 2019 central Nepal’s Kali Gandaki River correlates them precipitation indices computed 77 stations across basin. Nine four other ratio-based are used comparison. Percentage contributions maximum 1-day, consecutive 3-day, 5-day 7-day annual provide information on severity extremeness. We found that suspended concentration had significant positive correlation with 3-day precipitation. In contrast, average correlations all indices. The existing erosion trend, driven by amount, intensity, frequency extreme precipitation, demands urgency source management Nepal Himalaya’s slopes. increment transports partially resulted anthropogenic interventions, especially landslides triggered poorly-constructed roads, changing nature climate variability.