CARIBBEAN BEACH-FACE SLOPES AND BEACH EQUILIBRIUM PROFILES
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Keywords

beach equilibrium profiles
beach profiles
Caribbean
beach slope

How to Cite

Boon, J. D., & Green, M. O. (1988). CARIBBEAN BEACH-FACE SLOPES AND BEACH EQUILIBRIUM PROFILES. Coastal Engineering Proceedings, 1(21), 120. https://doi.org/10.9753/icce.v21.120

Abstract

Field measurements performed on two Caribbean islands revealed that two-dimensional nearshore bottom morphology is well represented by Dean's (1977) model of the beach equilibrium profile, h - A xm, where h is depth below mean water level at a distance x offshore and A is a scale factor. For the curvature, m, we obtained an average value of approximately m - 1/2 through least squares curve fitting of observed profile data, yielding a more concave and therefore steeper profile inshore than m - 2/3, the average previously reported by Dean for quartz sand beaches in the United States. Furthermore, an objective measure of beach steepness was found to be A-*-'1", a quantity which utilizes both of Dean's parameters and which may serve as a surrogate for the beach-face slope, tan /3, on highly concave beaches. Reasonable correlations were found between A?-'m and the environmental parameter, H^ /gDT , where H^ is breaker height, D is sediment grain size, T is wave period and g is gravitational acceleration. Improved prediction of Caribbean beach slopes and beach equilibrium profiles is an important practical result.
https://doi.org/10.9753/icce.v21.120
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