quiz 13 Flashcards

1
Q

What are sea walls?

A

concrete walls placed at the foot of a cliff that reflect waves back to sea

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2
Q

What are gryones?

A

wooden structures built at right angles to the coast to prevent longshore drift

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3
Q

What are gabions?

A

metal cages filled with rocks and placed in areas vulnerable to erosion

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4
Q

What is rock armour?

A

Large rocks placed at the base of cliffs

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5
Q

What are 2 advanatages of sea walls?

A

1.it prevents erosion of the coast
2. it also acts as a barrier to prevent flooding

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6
Q

What is a disadvantage of sea walls?

A

its expensive to build and maintain

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7
Q

What are 2 advantages of gryones

A
  1. create wide beaches which slow the waves
  2. This gives greater protection from flooding and erosion
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8
Q

What is a disadvanatge of Gryones?

A

They starve beaches further down the coast

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9
Q

What are 2 advantages of gabions?

A
  1. Gabions absorb wave energy
  2. so reduces erosion
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10
Q

What is a disadvanatge of gabions?

A

They are a eye-sore to the public

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11
Q

What are 2 advanatges of rock armour?

A
  1. rock armour absorbs wave energy
  2. reducing erosion and flooding
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12
Q

What are disadvanatge of rock armour?

A

boulders can be moved around by strong waves so need to be replaced

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13
Q

What are 4 hard engineering coastal strategies?

A

sea walls,gabions,rock armour and gryones

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14
Q

What is beach nourishment and reprofilling?

A

sand and shingle from lower down the beach to upper part of beaches

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15
Q

What is Dune regeneration?

A

creating or restoring sand dunes by planting vegetation to stabilise the sand

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16
Q

What are 2 advanatges of beach nourishment and reprofilling?

A
  1. it creates wider beaches which slow the waves
  2. this gives greater protection from flooding and erosion
17
Q

What is a disadvantage of beach nourishment and reprofilling?

A

its very expensive and has to be repeated

18
Q

What are 2 advantages of dune regeneration?

A

absorb wave energy, preventing flooding and erosion

19
Q

what is a disadvanatge of dune regeneration?

A

the protection is limited