Sediment Transport and Water Flow Resistance in Alluvial River Channels: Modified Model of Transport of Non-Uniform Grain-Size Sediments
Gennady Gladkov, Michał Habel, Zygmunt Babiński, Pakhom Belyakov, Sediment Transport and Water Flow Resistance in Alluvial River Channels: Modified Model of Transport of Non-Uniform Grain-Size Sediments, Water - 2021, Vol. 13, iss. 15, art. no 2038, Punktacja całkowita MEiN: 70.000
Praca dotyczy zagadnień empirycznego modelowania charakterystyk przepływu wody w korytach rzecznych z ruchomym dnem oraz doskonalenia modelu transportu rumowiska w symulacji przekształceń koryt rzecznych na podstawie pomiarów terenowych na rzekach europejskich. Z przeprowadzonych obliczeń testowych wynika, że zmodyfikowana formuła van Rijna (1984) daje najlepsze wyniki symulacji transportu rumowiska. Uzyskane w toku badań wyniki pozwoliły na pozyskanie nowych danych, za pomocą których wydaje się możliwa poprawa jakości i rzetelności modelowania.
Abstrakt
The paper presents recommendations for using the results obtained in sediment transport simulation and modeling of channel deformations in rivers. This work relates to the issues of empirical modeling of the water flow characteristics in natural riverbeds with a movable bottom (alluvial channels) which are extremely complex. The study shows that in the simulation of sediment transport and calculation of channel deformations in the rivers, it is expedient to use the calculation dependences of Chézy’s coefficient for assessing the roughness of the bottom sediment mixture, or the dependences of the form based on the field investigation data. Three models are most commonly used and based on the original formulas of Meyer-Peter and Müller (1948), Einstein (1950) and van Rijn (1984). This work deals with assessing the hydraulic resistance of the channel and improving the river sediment transport model in a simulation of riverbed transformation on the basis of previous research to verify it based on 296 field measurements on the Central-East European lowland rivers. The performed test calculations show that the modified van Rijn formula gives the best results from all the considered variants.
