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Bedload Transport As An IndicatorOf Contemporary Transformations OfArctic Fluvial Systems

The article presents results of measurements of bedload transport rate, performed during the ablation season 2010 in the gravel-bed Scott River catchment (Svalbard). The study revealed temporal and spatial variability of bedload transport rate. It varied from 0.04 10 to 1.45 g m s at individual measurement sites. Channel-mean bedload transport rate (qa) amounted to 0.09 g m s, and the mean value at individual sites varied from 0.004 to 0.16 g m s for a 24-hour interval. In the period analysed, the river discharged a total of approx. 1834 kg of bedload, with mean daily bedload transport rate (Qb) of approx. 63 kg day. The volume and rate of bedload transport were dependent on hydrodynamic conditions and stream regime, directly related to weather. Also the effect of Scott Glacier retreat on discharge rate was emphasised, along with the indicative character of bedload transport rate. It responds to changes in the tempo and magnitude of processes in a glacial catchment quite rapidly, and therefore can be treated as a good indicator of transformations occurring in the arctic zone.