2008 Volume 52 Pages 1417-1422
Characteristics of a flow around submerged asymmetrical structures (we call this structure the BaNK block) in an irregular wave field were experimentally investigated. Komatsu et al. (2001) proposed ‘BaNK System’ in order to cope with beach erosion and shoaling of fairways. So far, regular wave fields and oscillatory ones with constant wave periods have been treated in hydraulic model tests and numerical simulations for the BaNK system. In this study, plural half cylinders are used as the BaNK blocks which are set on the bottom of a wave channel. It was found that vertical circulating residual currents were created over a wide area encompassing the block-set area in the irregular wave field like in a regular wave one. Furthermore, the relationships among the residual currents, the turbulent energy and the Reynolds stress in the BaNK system were estimated.
