Shorelines and Shoreline Processes - The Changing Earth: Exploring Geology and Evolution - page 420

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Figure 16.12 Spits and Baymouth Bars

Spit Recurved spit Baymouth bar

Direction of
wave approach

a Spits form where longshore currents deposit sand in deeper
water, as at the entrance to a bay. A baymouth bar is simply a spit
that has grown until it extends across the mouth of a bay.

Baymouth bar

Spit

A spit at the mouth of the Russian River near Jenner, California. Rodeo Beach north of San Francisco, California, is a baymouth bar.

c

b

◗ Figure 16.13 Tombolos and Breakwaters

Tombolo

Tombolo

rest

a Wave refraction around an island and the origin of a tombolo. b A small tombolo along the Pacifi c coast of the United States.