3 - SEA DEFENCE REPAIR IN NORTH NORFOLK

Here you will find digital images of man made sea defences .These were taken on the north Norfolk coastline between Sheringham and West Runton. To locate this area on a map click here. Man has been attempting to slow down the rapid rate of erosion in this area for over one hundred years. Sea defence systems are very expensive. Therefore, the defences are restricted to particular areas such as the towns and villages on the coasts.The sea defences must be continually maintained if they are to be effective. The sea defences are in turn eroded by the sea.Click on the thumbnail images for larger image files that will appear in a new window.

Images 1
Cliff Erosion
Images 2
Sea Defences
Images 3
Defence Repair
Images 4
Cromer
East cliff retaining wall refurbishment notice.
'Sheringham East Promenade Coast Protection Revenue Works' notice of working repairs to the town sea defences.
Workman concreting the base of the retaining wall
Not only is maintenance expensive it is unattractive to holiday makers.
Slumping cliff behind wall.
The poor drainage behind the wall has caused it to slump. Water acts as a lubricant to slumping.
Repairs underway out of holiday season.
The repairs and maintenance of the walls involves men and machines.
Revetment base which has eroded.
The revetments of east Sheringham are based on steel girders. The impact of the waves has destroyed the revetments that used to be here.
Section of revetment showing thier structure
This shows the parts of a revetment. A steel base for a sloping, slatted wooden wall. The slats allow the water to pass through the spaces.
Shallow revetment supported by beach material
These revetments have lasted longer. They are lower to the ground and are supported by the beach shingle and pebbles.
Wooden groyne supported to prevent collapse.
This wooden groyne has a timber frame to help support the sand bulit up on the west side due to longshore drift.
Revetments are only temporary.
These revetments need to be replaced.
Revetments in disrepair.
Revetments such as these are only temporary sea defences.

Coastal Management of sea defence.
Concrete sea walls reduce wave energy but are expensive to build and maintain.
Rock armour (rip-rap) is when large hard rock boulders are placed in front of sea walls and sometimes used as groynes. Expensive and ugly.
Groynes are walls built at right angles to the coast. They are traditionally made of wooden railway sleepers but they can be made of rock armour. They stop beach migration.
Gabions are wire netted blocks of medium sized pieces of hard rock. Expensive and can be ugly.
Revetments
are slatted and angled low wooden walls parallel to the beach. They act to absorb wave energy and protect soft cliffs. Ugly and liable to rapid damage.

Images 1
Cliff Erosion
Images 2
Sea Defences
Images 3
Defence Repair
Images 4
Cromer

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