Coastal erosion: Holderness Flashcards Preview

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Flashcards in Coastal erosion: Holderness Deck (10):
1

Average rate of erosion?

1.8m a year

2

The length of the coastline

6.1km long

3

Where does it stretch from?

Flamborough Head to Spurn Head

4

Causes of this erosion?

-Easily eroded rock type

-Narrow beaches

-Powerful waves

5

How does easily eroded rock type affect erosion?

-The cliffs are made of till (boulder clay)

-Easily eroded through corrasion but it is also prone to slumping

6

How do narrow beaches cause erosion?

-beaches slow the waves, reducing their erosive power. Narrow beaches protect the cliffs less.

They are narrow because: Flamborough head sstops sediment from the north replenishing the beaches along Holderness. It is also made of chalk which dissolves when eroded rather than making sand for the beaches

-Coastal defences: at Mappleton lead to narrow beaches. This is a human cause of erosion

7

How do powerful waves cause erosion?

-The long fetch all away from the Arctic Ocean

-The coast faces the dominant wind and wave direction from the north-east

8

Social impacts of the erosion

-Property prices along the coast have fallen sharply for those houses at risk from erosion

-30 villages lost since the Roman times

9

Economic impacts of coastal erosion

-Visitor numbers in Bridlington dropped by over 30% between 1998 and 2006

-Seaside Caravan Park at Ulrome is losing an average of 10 pitches a year

-£2 million was spent at Mappleton in 1991 to protect the coast

-The Gas Terminal at Easington at risk (25m form cliff edge). This terminal accounts for 25%

-80,000m^2 of good quality farmland is lost each year. Effect on the livelihood of farmers

10

Environmental impacts of erosion

SSSIs are threatened e.g. the Lagoons near Easington are part of an SSSI. It has a colony of over 1% of the British breeding population of little terns.

-The lagoons are separated from the sea by a narrow strip of shingle and sand. Erosion of this would connect the lakes to the sea and 'The Lagoons' would be destroyed