gravel-bed river, hydraulic modelling, grain-size parameters, downstream fining, the Bečva River, Flysch Carpathians

Downstream changes in the grain-size of bars of the Bečva River at 56.0-42.0 r. km were investigated to determine the impact of channelized and re-naturalized channel-reaches. The study was focused to (i) identify general patterns of channel morphology of the contrast wandering and channelized reaches, sediment inputs and its disconnectivities, (ii) describe the downstream variations in the grain-sizes of gravel bars, (iii) analyse the hydraulic parameters of cross-sections related to investigated bars and (iii) assess the relationships between the hydraulic and grain-size parameters derived from regulation works and re-naturalized processes.