Author(s)

P. Holmes & S.P. Samarawickrama

Abstract

The paper describes the application of two mathematical models to predict the tide and wave- induced changes at a coastal lagoon entrance. The tidal model is a typical depth-averaged finite difference model which predicts water surface elevations, the two dimensional tide induced velocity field, the residual currents and sediment transport rates in the lagoon and its entrance/exit. The water surface elevations and the depth averaged velocities within the lagoon were evaluated numerically by solving the time dependent non-linear equations of mass and momentum, in the horizontal plane, using the alternating direct implicit finite difference scheme. The two depth integrated momentum equations were formulated to include the effects of the earth's rotation, bed resistance, turbulent diffusion and con

Keywords