Coastal Defences

Question 1

Name 1 advantage and disadvantage of sea walls

Answer 1

curved top blocks waves
expensive

Question 2

Name 1 advantage and disadvantage of groynes

Answer 2

stops longshore drift
accelerated erosion rate at South as deprived of sediment

Question 3

Name 1 advantage and disadvantage of rip rap

Answer 3

absorbs wave energy
expensive rocks from Norway

Question 4

Name 1 advantage and disadvantage of beach replenishment

Answer 4

looks natural
does not last long

Question 5

Name 1 advantage and disadvantage of dune regeneration

Answer 5

creates sand dunes which reduce moisture content
sometimes roots do not stabilise - wilting trees

Question 6

Name 1 advantage and disadvantage of gabion baskets

Answer 6

absorbs wave energy
visually unappealing