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in oceanography, an oscillating movement up and down, of a body of water caused by the frictional drag of the wind, or on a larger scale, by submarine earthquakes, volcanoes, and landslides.
..... Click the link for more information. , in oceanography; beachbeach,
a gently sloping zone where deposits of unconsolidated sediments are subject to wave action at the shore of an ocean or lake. Most of the sediment making up a beach is supplied by rivers or by the erosion of highlands adjacent to the coast.
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the breaking of a sea or lake wave directly on the shore. The oscillatory movements of the water cause the uprush and backwash. The surf plays the principal role in the destruction of retrograding shorelines and in the formation of beaches. It shifts the alluvium on beaches on accumulation shores.