Author(s): Anna Lenar-Matyas; Jerzy Ratomski; Hanna Witkowska
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Keywords: Sediment transport; River bed degradation; Dams; Sediment sorting
Abstract: In the paper riverbed degradation downstream a hydraulic structure is discussed. As the major issue is considered sediment sorting which occurs during this process. Sediment sorting is obtained by computation by of sediment transport by size fractions with the use of sediment transport formula specially worked out for Carpathian rivers. The AR formula was prepared for a sediment mixture with taking into account a possibility of blocking in grains. The existence of armour coat and its removal by flood waves is included into computation. The method is tested on a case of riverbed erosion downstream Dobczyce Dam on Raba River. The computations are done for simplified prismatic channel and for natural cross-sections and longitudinal profile. The results showed the importance of sediment sorting–the significant changes of sediment distribution curves were observed. Therefore the influence of sediment sorting is important for the riverbed degradation.
Year: 1999