Ocean101-Ch11-Part2 - 3 Depositional Coasts Longshore Drift...

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1 3. 3. Depositional Depositional Coasts Coasts Longshore Drift Longshore Drift The transport of sediment (e.g., sand) parallel to the shoreline, mainly in the surf and swash zone. Longshore drift is the main way sediments move along coasts. See Fig. 11.14, p. 255 Swash up, Backwash down Fig. 11.16, p. 257 Large-Scale Features of Depositional Coasts
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2 How a spit forms Cape Cod, Martha’s Vineyard, & Nantucket (Mass.) Glacial moraine sediments, reworked by ocean waves A single section of coast with river input, longshore drift, and eventual output down a submarine canyon. Sediment inputs and sediment outputs are balanced. Coastal Cells See Fig. 11.15, p. 256 Coastal Region
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3 Lower part of beach exposed at low tide Tidal fluctuations alternately expose and submerge tidal flats which almost surround Mont-Saint-Michel, France Tidal flats Tidal flats Beaches Sediments are composed of locally available materials. The sizes of particles vary widely between beaches. Particle size largely determines the slope of the beach.
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