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467198
Coastal management - Hard engineering
Descripción
GCSE (Coastal Zone) Geography Mapa Mental sobre Coastal management - Hard engineering, creado por SEOTP el 07/01/2014.
Sin etiquetas
coastal zone
geography
geography
coastal zone
gcse
Mapa Mental por
SEOTP
, actualizado hace más de 1 año
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Creado por
SEOTP
hace más de 10 años
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Resumen del Recurso
Coastal management - Hard engineering
Build dams and reservoirs
Build a dam to trap and store water - release it in a controlled way
Water is usually stored in a reservoir behind the dam. This water can be used to generate HEP or for recreational purposes
Sediment is often trapped behind the wall of the dam, leading to erosion downstream
Settlements and agriculture land may be lost when the river valley is flooded to form a reservoir
If rain is downstream of the reservoir they have no effect
It controls the amount of discharge, therefore the amount of flooding
Building a dam can be very expensive
In large flooding events they are vulnerable to breaking and are expensive to build
Sea wall
Protects cliffs and buildings
Expensive to build
Can look unattractive
Deflects the power of the waves
Groynes
Exposes other area of the coastline
Can be easily damaged
They stop sand from being carried away along the coastline
Rock armour
A barrier of large rocks soaks up the energy of the waves, reducing erosion
They are expensive
Gabions
Cages full of rocks which break the power of the waves
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