Author(s)

R.W. Barber & L.J. Scott

Abstract

This paper describes an explicit finite-difference scheme for solving the depth- averaged shallow water equations on a non-orthogonal boundary-fitted mesh. The curvilinear approach provides an accurate representation of the complex shape of natural flow domains and therefore avoids the approximate 'staircase' representation associated with models based upon a regular Cartesian finite- difference grid. Special attention is given to the simulation of the exposure and re-submergence of the inter-tidal zones which cause the flow perimeter to change shape as the tide ebbs and flows. In addition, grid adaptation to deep water is used to improve the resolution of the navigation channels. The versatility of the model is demonstrated by simulating the upper reaches of

Keywords