Coastal Deposition ~ Sand Bars
Bars – These are deposits of sand, which block the () entrance
to a bay. They develop as a result of long shore () drift (L.D.).
This is when a swash hits () a beach at an angle; as it goes up
the beach it carries sediment () with it. It returns down the
beach with the sediment (), as the backwash due to gravity ().
This process repeats and so moves sediment () along the beach.
If there is a bay, the sediment is pushed across () by the L.D.
to form a beach (), which starts to extend across the bay,
eventually reaching () the other side; forming a barrier across
the bay or a bar. The sediment on the bar gets smaller and
rounder as it () moved, Due to attrition eroding the stones as
they bang () into each other. Behind the bar water is trapped
giving () a lagoon, There is much deposition as no flow; giving
mud flats (). The bar may be broken during stormy weather as
waves wash their way () through it.