WAVE FRICTION FACTOR OVER ROUGH SEABEDS

In the presence of large roughness, such coral reef or rocks, frictional wave dissipation is expected to play a crucial role in wave transformation, possibly dominating over depth-induced breaking dissipation (Monismith et al. 2015). The wave friction factor, f w, is a key parameter for the representation of frictional wave dissipation in phase-averaged numerical models. Based on laboratory experiments of surf zone dynamics over a series of roughness layouts, the present study aims to provide further insight on (I) the validity of the existing fwin low ranges of Ao/Kr, i.e. in the presence of large roughness, and (ii) to decipher the connection between wave frictional dissipation and the architectural structure of the seabed roughness.