2b.8b

Question 1

What is rapid coastal recession caused by

Answer 1

Physical factors - geological and marine
Human Factors - dredging or coastal management -CS GUINEA

Question 2

Describe rising sea level in Guinea

Answer 2

10cm since 1950
1m by 2000
$1.7 billion of loss for airlines

Question 3

Describe swell waves

Answer 3

Stormy monsoon months (Aug Oct)
Wave heights 3m
$3.8m of damage to kenya unemployment for workers

Question 4

Describe diamond mining

Answer 4

Gravel extracted from river
Diamonds Retrieved
Gravel (sediment) not always returned

Question 5

Describe sand extraction

Answer 5

removed from river
used for housing
sediment not transported to coastline

Question 6

Describe strong waves

Answer 6

Breaking on soft cliff material

Question 7

Describe sea defences

Answer 7

interruption of sediment transfer (longshore drift)

Question 8

Describe coast management

Answer 8

No beach nourishment
Sea walls very expensive ($90m/10km)

Question 9

Describe offshore dredging

Answer 9

removing material for ports/beach nourishment
deep water, energy retained

Question 10

Describe sea defences

Answer 10

interruption of sediment transfer (longshore drift)

Question 11

Describe mangrove deforestation

Answer 11

• used for fuel wood to smoke fish
• for fuel supply

Question 12

what are geological factors

Answer 12

Geological factors include:
Lithology - soft rock type, weak cohesive bonds, porous rocks
Geological structure - well jointed rocks, rocks with seaward dipping beds, heavily faulted rocks

Question 13

what are marine factors

Answer 13

Marine factors include:
long wave fetch promoting large, destructive waves
strong longshore drift that quickly removes collapsed sediment allowing erosion to restart