Coastal management

Question 1

What are the advantages of each replenishment?

Answer 1

Relatively cheap, easy to maintain, blends in with existing beach, increased tourist potential by creating a bigger beach

Question 2

What are the disadvantages of beach replenishment?

Answer 2

Needs consistent maintenance unless structures are built to retain beach

Question 3

What is Dune fencing?

Answer 3

Marram grass planted to stabilise dunes with their root system, fences used to keep people off newly planted areas

Question 4

What are the advantages of dune fencing?

Answer 4

Maintains a natural coastal environment, improves or keeps wildlife consistent, relatively cheap (200-2000/100m)

Question 5

what are the disadvantages of dune fencing?

Answer 5

Time consuming, people don’t always respond well, can be damaged during storms

Question 6

What is managed retreat?

Answer 6

Allowing natural processes like flooding or the erosion of an area of relatively low value land, it doesn’t intervene the way hard engineering does

Question 7

What are advantages of managed retreat?

Answer 7

1)Mors sustainable
2)An increasingly popular option as sea levels rise

Question 8

What are the disadvantages of managed retreat?

Answer 8

Land most likely belongs to someone, so money is lost as land is lost

Question 9

How does a sea wall work?

Answer 9

Concreate/ Rock barrier placed at foot of cliffs or at top of beaches, curved face to deflect waves

Question 10

Advantages of a sea wall?

Answer 10

Effective at stopping waves, typically has walkway for people to walk on

Question 11

Disadvantages of a sea wall?

Answer 11

Can look unnatural and obtrusive, expensive and high maintenance costs

Question 12

How do Groynes work?

Answer 12

Timer or rock structures built to sea from coast, trap sediment from being moved by longshore drift

Question 13

Advantages of Groynes?

Answer 13

Creates a wider beach-popular for tourism, not too expensive, provides useful structure for fishing

Question 14

Disadvantages of Groynes?

Answer 14

By interrupting longshore drift erosion occurs elsewhere, unnatural and unattractive

Question 15

How do Gabions work?

Answer 15

Wire cages filled with rocks to support a cliff or act as a buffer from sea

Question 16

Advantages of Gabions?

Answer 16

Cheap to design and flexible in final design, improves drainage off of cliffs, will eventually become vegetated and blend in with landscape

Question 17

Disadvantages of Gabions?

Answer 17

Looks unattractive for a while, cages only last 5-10 years before rusting

Question 18

How does rock armor/ rip rap work?

Answer 18

piles of large boulders at foot of cliff, rocks force waves to break

Question 19

Advantages of rip rap?

Answer 19

relatively cheap and easy to maintain, provide interest, used for fishing

Question 20

Disadvantages of rip rap?

Answer 20

Rocks are often sourced abroad or from other parts of coastline