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Class 9b: Coastal landforms and rivers

Learn about the various coastal landforms formed by erosion, ocean transport, and deposition processes. Discover how the coast can be stabilized and the unintended consequences that may arise. Explore the importance of coral reefs in protecting shorelines. Delve into fluvial basics, including processes, watershed concept, erosion, transport, and deposition along rivers.

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Class 9b: Coastal landforms and rivers

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  1. Class 9b: Coastal landforms and rivers

  2. Ocean erosion

  3. Coastal landforms from erosion • On newer, more rugged coastlines

  4. Ocean transport • Longshore currents: waves not parallel to shore

  5. Ocean deposition • Beaches!

  6. Coastal deposition • On coastlines already worn down

  7. Coastal deposition

  8. Stabilizing the coast • Harbors or bays may close over, cliffs may fall

  9. Stabilizing the coast • Unintended consequences

  10. Coral reefs • The only organic landform

  11. Coral reefs

  12. Coral reefs • Absorb energy from waves and protect shores

  13. Fluvial basics • Fluvial processes: involving running water

  14. Fluvial basics • Watershed: all the land that drains into a stream

  15. Fluvial erosion • Amount of erosion depends on: • Speed of river • Degree of turbulence • Type of bedrock

  16. Fluvial transport • Material carried by a stream is the stream load • Bed load, dissolved load, or suspended load

  17. Fluvial deposition • Found all along rivers; especially at mouth

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