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.
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