Temporal
When was the last Ice-Age?
20,000
What does the headland do to wave approach?
Creates wave refraction
What is the beach slope in the north?
3 degrees
What does Mayor Island do to wave approach?
Causes wave refraction.
What is the wave energy in the south?
55Jms-1
Where the sea level located during the last Ice-Age?
Mayor Island
What is the wave energy on the headland?
75 Jms-1
What is the wind strength in the north?
4.2ms-1
What type of coastline is created by Mayor Island?
Destructive.
What is the wind strength in the south?
9ms-1
6,000 years ago
What does the headland do to the littoral cell?
Widens it
How wide is the beach in the north?
100m
What type of events magnify the impacts of Mayor Island on the coastline.
Storms, large waves, cyclones.
What is the beach width and slope in the south?
40m and 11 degrees
When were Geomorphological Processes most active?
5mill years ago
What are the 3 erosional features of the headland?
Stacks, caves and sea cut platform
How high are the dunes in the north?
1m
What has been built to prevent erosion from Mayor Island
Sea wall.
How high and deep are the dunes in the south?
4-5m and 100m +
How long did it take for the spit to turn into a tombolo?
5,000 years
What does the headland do to aeolian processes on the northern end of the beach and how does that affect dune development?
Describe the littoral cells impact on depositional rates in the north.
Because it is widened by the nearby headland the waves are unable to transport significant volumes of sand in their swash which reduces sediment deposition.
What other factor created by the headland results in this part of the beach having erosional tendency?
Widened littoral cell reduces the volume of sediment being deposited.
What are the two major factors ensuring high volumes of sediment are transported in this region?
Strong wind (high saltation/suspension rates), higher wave energy and the littoral cell is in the wave zone.