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WorksheetsCoastal erosion engineering techniques
Total questions: 21
Worksheet time: 3mins
Name
Class
Date
1.
Which one of the following is a soft engineering technique?
a)
Groynes
b)
Dune stabilisation
c)
Rip rap
d)
Revetments
2.
What is the main disadvantage of using groynes?
a)
They can starve other beaches of sediment
b)
Aesthetically displeasing
c)
Expensive
3.
Groynes are an effective technique because they stop the process of what occurring?
a)
Transportation
b)
Longshore drift
c)
Nearshore drift
d)
Deposition
4.
A recurved sea wall is effective because it...
a)
Is not particularly expensive
b)
Stops erosion of the coastline
c)
Deflects wave energy back out to sea
5.
Sea walls can cost up to what per m?
a)
£50,000
b)
£500
c)
£5000
d)
£50
6.
What is the typical lifespan of a sea wall?
a)
100 years
b)
50 years
c)
75 years
d)
25 years
7.
What is the main disadvantage of a sea wall?
a)
Aesthetically displeasing
b)
Encourages tourism, and thus litter
c)
Creates strong backwash, causing erosion beneath the wall.
d)
Expensive
8.
How much do groynes cost per m?
a)
£750
b)
£1200
c)
£120
9.
What is the typical lifespan of a groyne?
a)
25 years
b)
50 years
c)
75 years
d)
15 years
10.
Where does most rip rap originate from?
a)
Scotland
b)
Norway
c)
Spain
d)
Italy
11.
What is the cost per m of rip rap?
a)
£2500
b)
£1000
c)
£500
d)
£1500
12.
What is the main advantage of rip rap?
a)
Stops erosion
b)
Aesthetically pleasing
c)
Minimal effect on wildlife, often creating new habitats
d)
Environmental damage due to transportation
13.
What type of areas are typically subjected to the management technique of managed retreat?
a)
Low value areas e.g. farmland
b)
Low lying areas
c)
Housing estates
d)
High value retail areas
14.
Is there any cost associated with managed retreat?
a)
No - no techniques are put in place
b)
Yes - techniques are put in place
c)
No - this is a soft engineering method
d)
Yes - compensation has to be offered
15.
What are gabions?
a)
A type of sea wall
b)
Barriers at right angles to the beach
c)
Boulders
d)
Steel mesh cages
16.
How much do gabions cost per m?
a)
£200
b)
£300
c)
£400
d)
£500
17.
What is the main disadvantage of gabions?
a)
They take a few years to blend in once plants grow over them.
b)
They are the most un-natural looking defence
c)
They only last 10 years.
d)
Hazardous, with sharp edges.
18.
What is the typical life span of a gabion?
a)
15 years
b)
20 years
c)
10 years
d)
5 years
19.
What is the main advantage of beach replenishment?
a)
It is a soft engineering technique
b)
It is cheap (£3-10 per m)
c)
Creates a natural looking beach
d)
Short lifespan
20.
Offshore breakwaters lie...
a)
parallel to a beach
b)
perpendicular to a beach
21.
What is the main disadvantage of breakwaters?
a)
They can destroy the sea floor habitat
b)
They don't look natural
c)
They can be used as a first line of defence, to protect other defences
d)
An indirect protection method
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