Beach Erosion.

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Presentation transcript:

Beach Erosion

Shoreline Features Beach Estuaries Sloping band of sand, pebbles, gravel, or mud Estuaries Area where the lower end of a freshwater river or stream enters the ocean Water is brackish (mixture of salt and freshwater)

Sand movement Parallel to shore Southward along both U.S. coasts most of the time

Beach Drift and Longshore Currents

Features caused by deposition Fig. 11-7

Stabilizing Beach Erosion Groin and groin field Perpendicular to shore Traps sand between groins Interrupts longshore current

Coastal Stabilization Structures

Jetty Built to protect harbor entrance Sand on upcurrent side

Coastal Stabilization Structures

Breakwater Parallel to shore Offshore Deposition behind breakwater

Coastal Stabilization Structures

Erosion enhanced seaward of wall Seawall destroyed Beach narrowed Built on beach Parallel to beach Erosion enhanced seaward of wall Seawall destroyed Beach narrowed

Alternatives to hard stabilization Limit construction near shore Relocate businesses/homes destroyed by wave erosion

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