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Earth science 16.3
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Transcript

  • 1. 16.3 Shoreline Processes and Features
  • 2. Beach
    The accumulation of sediment found along the shore of a lake or an ocean.
  • 3. Wave Refraction
    The process by which the portion of a wave in shallow water slows, causing the wave to bend and tend to align itself with the underwater contours.
  • 4. A near-shore current that flows parallel to the shore.
    LongshoreCurrent
  • 5. Barrier Islands
    A low, elongated ridge of sand that parallels the coast.
  • 6. Key Concept
    How are sediments along the shoreline moved?
    Waves along the shoreline are constantly eroding, transporting, and depositing sediments. Many types of shoreline features can result from this activity.
  • 7. Key Concept
    How does refraction affect wave action along the shore?
    Because of refraction, wave energy is concentrated against the sides and ends of headlands that project into the water, whereas wave action is weakened in bays.
  • 8. Key Concept
    What do longshore currents do?
    Turbulence allows longshore currents to easily move the fine suspended sand and to roll larger sand and gravel particles along the bottom.
  • 9. Key Concept
    By which processes do shoreline features form?
    Shoreline features that originate primarily from the work of erosion are called erosional features. Sediment that is transported along the shore and deposited in areas where energy is low produced depositional features.
  • 10. Key Concept
    What structures can be built to protect a shoreline?
    Groins, breakwater, and seawalls are some structures built to protect a coast from erosion or to prevent the movement of sand along a beach.
  • 11. Key Concept
    What is beach nourishment?
    Beach nourishment is the addition of large quantities of sand to the beach system.