spits, bars and tombolo's

Spits-

• Eroded materials are carries along the beach by long shore drift.
• The direction of prevailing wind causes the wind to approach the coastline at an angle. Beach sediment moves in zigzag patterns along the coast line.
• Long shore drift continues to transport sediment along passed the end of the coast line.
• A change in wind direction causes the spit to curve. A recurved lateral is formed.
• fresh water/sea water are trapped behind the spit as it forms.
• As the water behind the spit is sheltered form waves plants begin to colonise. Salt marshes/sand dunes form in the lagoon.

Bars-

Bars are formed when too headland have grown so long it join two headlands together.

Tombolo's-

Tombolo's are formed when a pit attaches itself to an island E.g. Llandudno.