Abstract
This paper develops a quasi-three-dimensional neasrshore current model that accounts for volume fluxes due to waves and surface rollers. While the present model follows the concept of depth-integrated 2DH mass and momentum conservation equations, the model splits the water column at the wave trough level and has 2DH equations respectively in two layers. Decomposing velocity fields into multiple components due to different phenomena, such as waves, surface rollers and slowly varying mean current, and time-averaging over the wave period, the model expresses the influence of additional volume fluxes and momentum forces in explicit formulae. The model showed excellent predictive skills both in undertow and longshore currents on the long straight beach and more complex circulation currents behind the submerged breakwater.
