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Geological Society, London, Special Publications; 1993; v. 72; p. 145-157;
DOI: 10.1144/GSL.SP.1993.072.01.13
© 1993 Geological Society of London

Coastal Dunefields

Foredune morphology and sediment budget, Perdido Key, Florida, USA

Norbert P. Psuty

Institute of Marine and Coastal Sciences, Rutgers — The State University of New Jersey, New Brunswick, New Jersey, USA 08903

Along-shore foredune morphology on the eastern portion of Perdido Key is fitted to a model of foredune development related to sediment budget. The Perdido Key barrier island has a long history of shoreline erosion, up to 2 m a–1 for over a century. Sediment availability was altered in 1985 because of beach nourishment. Subsequent re-working of the beach fill has transferred sediment in the along-shore direction as well as cross-shore. Over three years of survey data, including passage of three hurricanes, and aerial photo coverage portray the morphological changes in the foredune system and the displacement of the shoreline. Measurements of the changes in a spatial context record sediment redistribution from the nourishment area. Measurements of cross-sectional area changes support the model of foredune enhancement associated with negative sediment budget in the beach. Net along-shore changes of the foredune compare well with the barrier-island foredune development model.