1. Beach Erosion

2. 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)

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

4. Beach Drift and Longshore Currents

5. Features caused by deposition
Fig. 11-7

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

7. Coastal Stabilization Structures

8. Jetty
Built to protect harbor entrance
Sand on upcurrent side

9. Coastal Stabilization Structures

10. Breakwater
Parallel to shore
Offshore
Deposition behind breakwater

11. Coastal Stabilization Structures

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

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