1. Topics: Erosion by Mass Movements, Wind, and Waves.

2. Mass Movements

3. Gravity --

4. Talus Formations
Talus – -.

5. Frost Wedging and Talus Cones

6. Mass Movement -
Ex) -

7. Mass Movements
Landslide
Mudslide

8. Mass Movements
Creep
Avalanche

9. Creep
Creep – --

10. Wind Erosion

11. -

12. Iraq, 2005

13. Wind Formed Features

14. Dune Formation --

15. Types of Dunes
Barchan
Linear
Transverse
Parabolic

16. Types of Dunes
Barchan
Linear
Transverse
Parabolic

17. Other Eolian (Wind) Features
Arches
Ventifacts
Ancient artifacts altered
sandblasting

18. Other Eolian (Wind) Features
Sandblasting – --
Arches
Altered Ancient Artifacts
Ventifacts

19. Ventifacts – -

20. Wave Erosion

21. Wave Erosion --. Recent Photo 2001
Montauk Lighthouse on top of Turtle Hill, 297 feet from the tip of Montauk Point (1800)
Recent Photo 2001

24. Ocean Waves – --

25. Sea arch – a feature of coastal erosion
Formed on Big Island of Hawaii

26. Top View of the Beach Long Shore Current Ocean Beach
Where is my towel?
Beach

27. Sand

28. Long Shore Current --
The current moves sediments which results in a change in the beach face.

29. L.I. Natural Beach Features
Sand Bar
Spit
Lagoon
Barrier Island
Diagram showing the environments of a barrier island system. (from Blatt, et al, 1980, Petrology of Sedimentary Rocks)

30. Fire Island, Barrier Beach
Davis Park
Democrat Point

31. L.I. People made Beach Structures
Jetty –
Groin –
*BIG impact on the beach erosion rates.

32. Jetties

33. Jetty

34. Groin
Long Shore Current Direction
Beach

35.                          
Groin

36. What is a Tombolo?
Extends outward from the shore, connecting with an island. Goat Rock Beach, CA, the low, sandy bar is reinforced with boulders and serves as a parking lot

37. What direction is the longshore current moving?

38. What direction is the longshore current moving?

39. Final Question What do you predict will happen to the houses below?