Tombolo/bar/ barrier beach

Question 1

Tombolo

Answer 1

Is a spit which joins an island to the mainland.
Can only occur if conditions for deposition are present.

Chesil beach S. England

Links isle of Portland to mainland
30km long

Question 2

Bar

Answer 2

If a spit developed across a bat where there is no strong flow of water from landward side then sediment can reach across to other side.

Only if conditions for deposition are present as well

Question 3

What will form behind bar ?

Answer 3

Lagoon

May silt up over time

Question 4

How else can bars be formed ?

Answer 4

Onshore migration of material from offshore as sea levels rose following last ice age

Can be partially submerged by incoming tides

Slapton Ley , Devon

Question 5

Offshore bar.

Answer 5

Ridge of beach material that remains semi submerged accumulates Seaward of breakwr zone

Question 6

Barrier beach / island

Answer 6

Elongated bank of deposited sand/ shingle lying parallel to coastline.

Not submerged by incoming tides.

Sand dunes can develop.

Sheltered areas between barrier beach and land can be one marsh / lagoon

Question 7

Example barrier beach

Answer 7

Lido of Venice