Advection schemes and grid design

We discuss the characteristics of the first order advection scheme in coast al areas. In particular we focus our attention on the relationship between the geometry of the coast, as represented in the computational grid, and th e wave fields derived from a numerical model. Having considered an alternat ive scheme, we show how the results may depend substantially on the charact eristics of the scheme. It follows that, when modelling in coastal areas, t he grid distribution and the advection scheme should be chosen taking recip rocal account of their characteristics.