Rivers and Coasts

• Sea walls are £2000 per meter
• Rock armour is large boulders placed at the foot of the cliff
• Gabions are rocks held in metal mesh cages
• Gabions cost £100 per metre
• Groynes stop longshore drift
• Beach nourishment is when sand is pumped onto the beach
• Reprofiling is when sediment is redistributed from the lower part to the upper part of the beach
• Dune regeneration is when grass is planted to trap sand to build them up