2,000 m
Fig. 11. Hyperbolic-tangent fit to Drakes Bay, California.
Fig. 12. Hyperbolic-tangent fit to Rosas Bay, Spain.
CONCLUSIONS
A database comprising 23 beaches in Spain and 23 beaches in the North America was
developed to examine the equilibrium shapes of headland-bay beaches. Convenient
software routines were written to automate the fitting process and make it objective (not
discussed in this paper). It is noted that such shapes are applicable to coasts with a
consistent predominant direction of net longshore sediment transport.
Based on our study, it is straightforward to fit the log spiral to shoreline-position
data, but this equilibrium shape cannot describe beaches with only one headland. In
addition, the log spiral is sensitive to the angular parameter defining it. For one-headland
Moreno & Kraus
13
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