Author(s): M. F. M. Yossef; W. S. J. Uijttewaal
Linked Author(s):
Keywords: Groynes; Groyne fields; Turbulence structures; Morphology
Abstract: In this study the dynamics of the flow near groynes are investigated at the two different flow stages, emerged and submerged. In order to perform numerical simulations with morphological changes it is important to have a clear view on the dynamical behaviour of the flow and the associated time-scales. For this reason, experiments have been conducted in a physical model with a scale of 1:40 for a schematised river reach, which is based on the geometry of the Dutch River Waal. Four electromagnetic flowmeters (EMF) were employed in order to obtain the horizontal velocity components. The recording time was long enough to cover the largest turbulence structure. The results demonstrate the differences between the nature of the turbulence in the two different flow stages. The results as well show the existence of different turbulence time-scales associated with the formation and migration of turbulence structures.
Year: 2003