Coasts Ao2

Question 1

Why is Dyrhólaey an example of a high-energy coastline?

Answer 1

Large fetch from Antarctica → strong wave energy → high erosion.

Question 2

What rock type influences Dyrhólaey coastal features?

Answer 2

Basalt from volcanic activity → black sand & pebbles.

Question 3

What has recent sea level change caused for Dyrhólaey?

Answer 3

Sea level drop → vast coastal plains formed.

Question 4

Give an example of Wave Rarefraction

Answer 4

Lulworth Cove, Dorset
Wave refraction focused on limestone, breaking through to softer rock behind.

Question 5

What is the worlds highest tidal range?

Answer 5

Bay of Fundy, Canada
Up to 16m due to funnel shape & resonance effect.

Question 6

Give an example of a storm surge?

Answer 6

Bangladesh (Cyclone Sidr, 2007)
Storm surge reached 6m, flooding 3 million homes.

Question 7

Give an example of a high and low energy coastline.

Answer 7

HIGH- Cornwall – 8,000km fetch, 6m waves in winter
LOW- The Wash, East England – low energy, deposition of salt marshes & mudflats

Question 8

Give an example of a disrupted sediment budget.

Answer 8

Nile Delta (Negative Sediment Budget)
Aswan High Dam reduced sediment supply by 95%.
Coastal retreat of 4.5m per year.