Deposition- Coastal Landforms

Question 1

Name 4 depositional features

Answer 1

Spits, bars, tombolo, beaches

Question 2

How are spits formed?

Answer 2

Example - Spurn Head, Holderness coast
Swash moves up beach at angle of prevailing wind
Backswash moves down beach 90* to coastline - gravity
Longshore drift transports material along beach
Deposition causes beach to extend until reaching estuary
Change in prevailing wind direction forms hook
Sheltered area behind spit encourages deposition - salt marsh

Question 3

How are bars formed?

Answer 3

Longshore drift extends the length of spit.
It may develop over a bay
May link 2 headlands together to form bar
A lagoon is formed behind bar

Question 4

What are tombolos?

Answer 4

When a spit joins mainland to island

Question 5

How are beaches formed?

Answer 5

Beaches are made up from eroded material that has been transported from elsewhere and then deposited by the sea.
Waves must have limited energy, so beaches often form in sheltered areas like bays.
Constructive waves build up beaches

Question 6

Name 2 characteristics of pebble beaches

Answer 6

Generally steep
Mainly destructive waves

Question 7

Name 2 characteristics of sand beaches

Answer 7

Shallow, long and wide
Mainly constructive waves