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Why does deposition happen
When waves or currents lose energy and can no longer transport sediment
What’s long shore drift
Waves approach the coastline at an angle. Sediment is zig zagged across the beach and transported along the coast
What are depositional landforms
Beaches, bays, deltas, tombolos, salt marsh, on shore bar, spits bars,
How is a beach formed
Waves break and slow down due to friction, the waves spills up the beach putting sediment on the beach. Smash slows down, dropping pebbles then sand.
How do landforms continue to change in a beach
Storm beach, bigger pebbles thrown to the top of the beach.
Berm(ridges)
Cusps, semi circle in dents ( sediment pulled away by rip current)
Seasonal - summer beach gets steeper and winter beach gets flatter due to high energy waves
How’s a spit formed
Longshore drift zig zagged sediment along the coast. Coast changes direction, waves slow down in sheltered area
What’s a spit
A long narrow beach extending from land across bay or estuary eg berullus spit Nile delta
How can a spit continue to change
If direction of wind changes the end bands/curves round (recurved end)
In sheltered area behind spit fine silt deposits and forms salt marsh
How does a bar form
A bar is a narrow beach from one side of a bay. Spit forms, lsd and deposition grow spit.the end of the spit rejoins mainland eg mandala bar Nile delta.
Continue to change as lagoon can dry up and bars can be breached by storm waves
How does a tombolo form
A tombolo is a narrow beach connecting an offshore island to the mainland. Wave refraction around an island, waves loose energy, sediment is deposited, building a beach linking to mainland
How does a salt marsh form
Waves break/ refract into calm water, friction slows waves completely, deposition of fine silts. It can continue to change as plants colonise salt marsh roots strength silts
