coastal management

Question 1

what are groynes, the pros and cons of groynes and the price

Answer 1

timber or rock structures built at right angles to the coast. They trap sediment being moved along the coast by longshore driftt- building up the beach

pros
-works with natural processes to build up the beach, increasing tourist potential and protecting the land behind it
- not too expensive

cons
- starve beaches further along the coast of fresh sediment (because they interrupt longshore drift) often leading to increased erosion elsewhere

• unnatural and can be unattractive

cost
5000 pounds to 10000 each

Question 2

what are sea walls, the pros and cons of sea walls and the price

Answer 2

Stone or concrete walls at the foot of a cliff, or at the top of a beach. They usually have a curved face to reflect waves back into sea.

pros
effective prevention of erosion.

they often have a promenade for people to walk along

cons
they reflect wave energy, rather than absorbing it
- they are very expensive to build and maintain
-they can be intrusive and unnatural looking

cost
6000/m pounds

Question 3

what are rock armour, the pros and cons of rock armour and the price

Answer 3

large rocks placed at the footof the cliff, or at thetop of a beach. I forms a permeable barrier to the sea- breaking up the waves, but allowing some water to pass through

pros
relatively cheap and easy to construct and maintain

often used for recreation - fishing, sunbathing

cons
can be very intrusive.
The rocks used are usually not local and canlook out of place with local geology
can be dangerous for people clambering over them
1000 000 to 3000 000/100 m