Shoreline Erosion Waves and Wind Shape the Shoreline
Mar 23, 2016
Shoreline Erosion
Waves and Wind Shape the Shoreline
Waves● Waves pound the rocks and shells creating
sand.● The sand on a beach will consist of
particles eroded from the surrounding area.● Hawaii's black sand beaches come from
the volcanic rock nearby.● White sand beaches come from shells and
coral.
Longshore Drift● The longshore current ( runs parallel to
shore) creates the longshore drift.● Longshore drift moves large amounts of
sand along beaches.● Groins are installed to keep sand from
drifting.
Longshore Drift● cat
Sand Trapped By Groins● cat
Longshore Current Landforms● Longshore current also transport sand to
form sandbars and spits● Spit – is a sand bar that has built up above
the waters surface with one end joined to land.
● Bay mouth bar- a spit that complete blocks a bay and creates a lagoon
● Tombolo – is an island that join to land by a thin strip of sand.
Spit● This spit is almost a
bay mouth bar
Tombolo● cat
Barrier Island● Barrier island are
formed by erosion and deposition
Headland● Headland – an area
of coastline that protrudes further into the sea than the surrounding coast.
Sea Arch● Sea arches form
when softer stone is eroded behind the headland.
Sea stack● Stacks form when
the roof of a sea arch collapses.