Coasts - Case Studies

Question 1

Isle of purbeck

Answer 1

East Dorset, a concordant coastline
Lulworth cove, resistant limestone slowly eroded until the entrance to lulworth cove was formed
Less resistant clay eroded behind
Formed a cove

Swanage bay, discordant, bands of soft and hard rock, form swanage bay

Question 2

Holderness - sediment cell

Answer 2

Erosion at one small are affected the entire sediment cell
Sediment cell: sources, transfer zone, sinks
Storms have a negative feedback effect on sediment cells
Human effects: sea level rise, management strategies

Question 3

Nile delta

Answer 3

Delta: a depositional landform created by sediment expelled from a river.
The Aswan high dam: trapped sediment. discharge, 35billion m3 to 10billion m3.
Sediment volume fell, rate of erosion increased, up to 200m/py

Question 4

Bangladesh - low lying land floods

Answer 4

Much of country 1-3 m above sea level
46% of the population less than 10m above sea level
70%of land 10m above sea level
3 major river floodplains
Storm surges
Unconsolidated sediment coastline
Mangrove deforestation

Question 5

Bangladesh - cyclone side

Answer 5

Failed management of embankments, and severity of the storm, caused environmental and social losses.
High winds, damaged infrastructure
Contaminated drinking water
15000 deaths

They had warning systems

1.7billion usd cost

Storm surges 6m high

150millon in aid

Damaged crops