The Central Coast Region of Western Australia has a Mediterranean climate (Gentilli, 1971), which encourages coastal recreation throughout the year. The region extends over a broad coastal plain which consists of Holocene shoreline deposits backed by hills of Late Pleistocene dune limestone (Searle and Semeniuk, 1985). Limestone landforms include cliffs, headlands and offshore reefs. The latter run parallel to the entire Central Coast shoreline and exert a strong influence on nearshore morphodynamics (Sanderson and Eliot, 1996). Dune landforms include foredune plains shore-parallel ridges, parabolic dunes, defla- tion plains, beach-ridge plains, and extensive mobile sand sheets that migrate up to 10m a year (Department of Planning and Urban Development, 1994