Holderness Coast Flashcards
Where is the Holderness coast situated?
North east of England, east coast of Yorkshire, north of the River Humber.
What is the direction of the prevailing wind on the Holderness Coast?
North-east to south-west. This is in line with the largest fetch from the Norwegian and the North Sea.
What are the main rock types on the Holderness Coast?
Boulder clay and chalk.
How strong is boulder clay?
Boulder clay is very weak.
How strong is chalk?
Around 10 times stronger than boulder clay.
What is the average erosion rate on the Holderness Coast?
1.7 metres per year.
What length of Withernsea is protected by defences?
2.26 kilometres - an extra 400 metres was added in 2020 to make this 2.7km.
What hard-engineering methods are used in Withernsea?
Concrete seawalls, timber groynes and rock armour.
In 2020, what mass of rock armour was placed at Withernsea?
70,000 tonnes.
Where was the rock armour supplied from for Withernsea?
Norway.
What rock was used for the rock armour?
Anorthosite (a rock similar to granite).
What are the downsides of protecting Withernsea using rock armour?
It is very expensive.
Erosion to the south of Withernsea will increase.
How long is the Holderness Coastline?
61 kilometres
What is the rate of erosion in Great Cowden?
10 metres per year
What length of the coastline is protected by hard engineering strategies?
11.4 kilometres
