Author(s): Akihiro Kadota; Koichi Suzuk
Linked Author(s):
Keywords: T and L types of groyne; PTV analysis; Proper Orthogonal Decomposition (POD); Coherent fluctuating pattern
Abstract: The several types of groyne have been used for the stabilization of banks, creating a navigation channel by confining the cross-sectional area and improving habitat of flora and fauna, especially for large rivers worldwide. The most important phenomena are local flow and local scour around the groyne tip. Therefore, turbulent flows around the groynes have been studied experimentally and numerically in the last decades. Furthermore, there are various studies on pollutant or sediment transport and its related erosion (or scour) phenomena around the groynes in rivers and coastal regions. The present study focuses on the effects of groyne shapes on the instantaneous-coherent flow and mean flow structures around I-type, T and L-type groynes. Experiments were conducted with the three types of groyne model by means of flow visualization technique and Particle Tracking Velocimetry (PTV). Experimental results show that the distribution of large shear layer, coherent vortices changes greatly with the groyne type.
Year: 2010