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Regional sea level, Southern Oscillation and beach change, New South Wales, Australia


Coastal erosion is a problem of increasing concern that affects 60% of the world's sandy coastline1. This erosion has been attributed to increased storminess, tectonic subsidence, eustatic sea-level rise, decreased shoreward sediment movement from the shelf, permanent longshore leakage of sediment from beach compartments, shifts in global pressure belts resulting in changes in the directional component of wave climates, and human interference2,3. No one explanation has worldwide applicability because all factors vary in importance regionally. Evaluation of factors is complicated by a lack of accurate, continuous, long-term erosional data. Historical map evidence spanning 100–1,000 yr has been used in a few isolated areas4–7; however, temporal resolution has not been sufficient to evaluate the effect of climatic variables. Air photographic evidence8 is restricted to the past 40 yr, and often suffers from insufficient ground control for accurate mapping over time. Ground surveying of beaches was rarely carried out before 1960 and is often discontinuous in time and space. I have resolved the problems of temporal and spatial continuity by studying change for the whole of Stanwell Park beach, New South Wales, Australia for the period 1895–1980 (Fig. 1). I report here that using the average high-tide wave run-up position measured accurate to ±2.5 m from oblique and vertical photographs, changes could be linked to regional sea-level variation and a globally significant climatic variable, the Southern Oscillation (SO).

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Bryant, E. Regional sea level, Southern Oscillation and beach change, New South Wales, Australia. Nature 305, 213–216 (1983).

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