Coastal management - Hard engineering

SEOTP
Mind Map by SEOTP, updated more than 1 year ago
SEOTP
Created by SEOTP over 6 years ago
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GCSE Geography (Coastal Zone) Mind Map on Coastal management - Hard engineering, created by SEOTP on 01/07/2014.
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Coastal management - Hard engineering
1 Build dams and reservoirs
1.1 Build a dam to trap and store water - release it in a controlled way
1.2 Water is usually stored in a reservoir behind the dam. This water can be used to generate HEP or for recreational purposes
1.3 Sediment is often trapped behind the wall of the dam, leading to erosion downstream
1.4 Settlements and agriculture land may be lost when the river valley is flooded to form a reservoir
1.5 If rain is downstream of the reservoir they have no effect
1.6 It controls the amount of discharge, therefore the amount of flooding
1.7 Building a dam can be very expensive
1.8 In large flooding events they are vulnerable to breaking and are expensive to build
2 Sea wall
2.1 Protects cliffs and buildings
2.2 Expensive to build
2.3 Can look unattractive
2.4 Deflects the power of the waves
3 Groynes
3.1 Exposes other area of the coastline
3.2 Can be easily damaged
3.3 They stop sand from being carried away along the coastline
4 Rock armour
4.1 A barrier of large rocks soaks up the energy of the waves, reducing erosion
4.2 They are expensive
5 Gabions
5.1 Cages full of rocks which break the power of the waves
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