Fig. 10. Plot of a versus b values for hyperbolic-tangent shape and best-fit line.

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called Point Reyes. The area is tectonically active and lies on the San Andreas Fault.

Beach sediments consist of discontinuous accumulations of well-to-moderately sorted,

fine- to coarse-grained sand interspersed with pebbles and gravel.

Fig. 11 shows the nautical chart with 56 digitized data points and the best-fit curve.

The visual fit is very good in the beach section close to the main headland. The curve

deviates from the shoreline in the middle section because of irregularities in beach plan

form and because of the presence of Drakes Estero (a river mouth).

Rosas Bay, Girona, Spain

Rosas Bay is located on the Northeast coast of Spain. It is a 2.2-km-long crenulate-

shaped beach with 1 to 1.5 headlands. Shoreline shape is controlled in great part by

jetties. Beach material is fine- to medium-size sand with median grain size in the range

of 0.24 to 0.29 mm. Fig. 12 shows an aerial view of the Bay with 29 digitized data

points and best-fit hyperbolic tangent. Excellent visual agreement is seen.

Moreno & Kraus