Sand Bar

• Sand bars


  Formed by the process of longshore drift which is lateral/zig-zag movement of the waves
• Longshore drift


  Lateral/zig-zag movement of the waves
• Sand bars


  • Formed as long as the supply of deposits is greater than the amount of erosion
  • Formed if a spit reaches the other side of a bay (no strong flow of water from a river into the sea) enclosing a sheltered lagoon behind it
• Swash


  Waves push material up the beach at an angle due to the prevailing wind
• Backwash


  Returning backwash is dragged back down the beach at right angles due to gravity
• Tombolo:

  • formed when a spit extends out from the mainland, connecting to an island.