Coastal Systems

The coastline within the NAR has a generally linear north-south alignment, consisting of a range of beach types backed by low dunes, with intervening sand promontories or points, rocky headlands, and low to high cliffs. The sandy deposits are generally underlain by a limestone platform, and have variously formed dune fields, sandy plains, and mobile sand sheets. These sandy landforms are broken in some areas by high cliffs, headlands, alluvial floodplains, seasonal wetlands and lagoons, and cave systems. The popularity of both natural and artificial lookouts with local residents and visitors alike indicates that the land and seascapes over the region are a prized natural value and are important socially, culturally and economically (NACC, 2005).

The coastal environment faces pressures from urban settlement, as the majority of the population within the NAR is concentrated with the coastal areas. A good proportion of the coast, especially between Lancelin and Dongara, is contained in Nature Reserves and National Parks and managed by the Department of Parks and Wildlife. Other areas are managed to varying degrees by Local Government, a mix of organisations (e.g. Unallocated Crown Land), or by private landowners (NACC, 2005).

The NAR lies in two coastal regions including the Batavia Coast and Central Coast Region. The Batavia Coast occurs in the Geraldton Hills Interim Geographic Bioregion (IBRA) and is comprised of foredune vegetation including grasses and shrubs (Spinifex longifolius, Olearia axillaris, Aristea isotider and Scaevola crassifolia).

Areas with sand over sallow rock support quite dense acacia and banksia tall shrubland, with the distinctive smelling Acacia rostellifera and Melaleuca cardiophylla forming thickets on limestone ridges. Further inland the array of low and tall shrubs increases, with eucalypts and acacias prominent (NACC, 2005).

The whole Central Coast area lies in the Lesueur Sandplains IBRA subregion and Swan Plain Coastal IBRA subregion. In the Quindalup dunes, which occur from the southern extremity of the region north to Green Head, there are three plant communities from the beachfront, moving inland. A dense low shrubland in the swales and secondary dunes, and dense, tall shrubland further inland. The coastal wetlands and limestone areas support their own distinct vegetation communities. The coastal areas between Lancelin and Guilderton, and between Cliff Head and Illawong are an important area for limestone endemics (NACC, 2005).

Coastline Movements - Vegetation Lines, Sourced from DoT. View full page map.

Beach Photo Monitoring in the NAR

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Photomon    For more information about Photomon, NACC’s photo monitoring App visit the NACC website.