Abstract
Groynes have been used for stabilization of banks and creating navigation channel by confining cross section, especially for large European and Japanese rivers. Therefore, studies on 2D shallow flows and transport phenomena in groyne field have paid attention to the proper environment for ecosystem and suitable design for bank protection and obtainment of enough depth of main channel.
Typical Japan-river characteristics are large variation of discharge due to big amount of rainfalls so that the groynes are affected by the instantaneous and coherent flows with high energy. Therefore, present study focuses the effects of instantaneous and coherent flow structures around a single groyne by means of a technique of shallow flow visualization and particle tracking velocimetry applied for the large velocity differences. In addition, the advection of coherent structures around the groyne are analyzed and discussed by means of POD decomposition and conditional sampling method.
