Coasts - North Yorkshire, Holderness Coast CS - HE Flashcards

1
Q

Where do the predominant winds come from?

A

The North East

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2
Q

How much material is deposited at spurn point?

A

3%

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3
Q

Where does the eroded material travel?

A

Southwards

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4
Q

Why is coastal management needed?

A
  • Protect economic assets -> tourism/gas terminal/port
  • Protect residential areas
  • To appease citizens campaigns
  • To address previous management issues
  • To manage retreat the line
  • To protect SSSI
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5
Q

What type of geology is at the Holderness coastline?

A
  • Boulder clay + glacial till
  • Limited sediment replacement
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6
Q

What type of fetch and waves occur here?

A
  • Long fetch
  • Strong destructive waves
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7
Q

What are the beaches like on the Holderness coastline?

A

Small + narrow

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8
Q

By how much is the Holderness eroding?

A

2 m/yr

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9
Q

How many shoreline management plans are there in the UK?

A

22

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10
Q

What protection is put in place in Scarborough?

A
  • Protecting £300 million assets from £25.7 million coastal defence schemes
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11
Q

What are the key places along the Holderness coastline receiving management?

A
  • Bridlington
  • Skipsea
  • Hornsea
  • Mappleton
  • Withernsea
  • Easington
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12
Q

What management at Bridlington?

A

Groynes

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13
Q

What management at Skipsea?

A
  • Limited defences protect residential properties
  • No groynes, limited beach material arrives
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14
Q

What management is implemented at Hornsea?

A
  • Sea wall protecting holiday resort with a promenade and hotel frontage
  • Wooden Groynes repaired and built at a cost of £5.2 million
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15
Q

Why is it important to protect Mappleton?

A
  • Protection of the B1242 road - tourism
  • High rates of erosion at Mappleton >2m a year
  • Cowden Farm and Grange Farm at risk
  • 30 homes need protecting
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16
Q

What management has been developed at Mappleton?

A
  • Hold the line
  • L shaped revetments (£2 million)
  • Rock groynes (scandinavian granite) and a 450m line of rock revetments
  • Cliffs at Mappleton regraded and planted to a reduced angle and therefore more stable.
17
Q

What are the unintended consequences of management at Mappleton?

A
  • Farmers have lost land eg Cowden Farm and Grange Farm Terminal groyne syndrome prevalent .
  • Huge crenulated bays carved out immediately after hard engineering at Mappleton
  • Reduced amount of sediment transported south to Spurn Point Spit and Humber estuary
18
Q

What are the intended consequences of management at Mappleton?

A
  • Kinetic and potential erosional energy of the waves NO longer an issue
  • High tide no longer reaches the cliff line
  • Large sandy beach retained.
  • Erosion is NO longer a threat
19
Q

What management has been developed at Withernsea?

A
  • Advance the line 9 times
  • Sea wall, rip rap in front of it, and rip rap extended to halt TGS
  • Defences cost £6.2 million -> good value save seasonal jobs
20
Q

Why did Easington gas terminal need protecting?

A
  • Protecting economic and strategic assets
  • Provides UK 25% of energy
  • Protect SSSIs, lagoons and bird sanctuary
  • Increased rates of erosion
21
Q

What management has been developed at Easington?

A
  • £4.5 million defences
  • 1991 1 Km revetment using 130,000 tons of rock was placed against the current cliff line.
22
Q

What is Spurn Point spit protecting?

A
  • Humber estuary -> shipping lanes in Humber port
  • Hull offshore wind farm industry
23
Q

How much land has been lost since roman times?

A
  • 3 miles
24
Q

What are the three main changes to the coastline?

A
  • Coastline retreat
  • Spurn point has become more recurved with a salt marsh behind it -> more deposits