A wave model for the Great Barrier Reef

A new wind wave generation model, WAMGBR, is presented that has been adapte d from WAM especially for use in the complex geometry of the Great Barrier Reef. A technique (reef parameterization) has been presented that incorpora tes sub-grid scale dissipation caused by coral reefs. Three other improveme nts to WAM have been proposed. An explicit/implicit finite difference schem e has been implemented that allows for more efficient modelling (longer tim e steps) while maintaining diffusive characteristics that are at least as g ood as those of WAM. An offset in discrete angles creates more uniform diff usive characteristics.. And, a transformed spherical coordinate system allo ws for more efficient grid sizes and smaller grid dependent refraction. Com parisons between modelling techniques and between model and measured data s how that WAMGBR produces very good results in the difficult challenge of mo delling both non-cyclonic and tropical cyclone waves in the geographically complex environment of the Great Barrier Reef. (C) 2000 Elsevier Science Lt d. All rights reserved.