ABSTRACT
This paper presents results of a field study to determine flow characteristics for a 4km-long reach of the Odra river including curved and straight sections of the channel regulated by groynes. A series of measurements of flows, bottom tracking and water level have been carried out at varied discharge to deliver a comprehensive set of data for the analysis of water depth, local and zonal flow velocity, discharge, resistance parameters. The analysis divides river cross-section into channel zone between the groynes, zone of groynes and flood plains. The variation of Manning’s n value with discharge and depth is determined as well as the contribution of the particular zones to the overall discharge. The influence of the channel curvature on the resistance is also established. Data from a historic event has been included to depict more reliable trends beyond the currently measured flows. Furthermore, using a 1D modelling the influence of groynes on the river channel conveyance is clearly demonstrated.
