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Untitled Prezi

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adam bingham

on 21 March 2013

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Transcript of Untitled Prezi

Definitions There are four types of coastal erosion,they are 1.Hydraulic action 2.Abrasion 3.Attrition 4. Corrosion Types of erosion 3.Attrition=when the bed load is eroded by itself and the bed. As rocks are transported downstream along a riverbed, the regular impacts between the grains themselves and between the grains and the bed cause them to be broken up into smaller fragments Secondary + Tertiary factors Geography Project Sea Erosion Coastal erosion is the wearing away of land and the removal of beach or dune sediments by wave action, tidal currents, wave currents, or drainage . The definition of abrasion is grinding and wearing away of rock surfaces through the mechanical action of other rock or sand particles 1.hydralic action=Hydraulic action occurs when the motion of water against a rock surface produces mechanical weathering. Most generally, it is the ability of moving water (flowing or waves) to dislodge and transport rock particles 2 .Abrasion= occurs as breaking waves which contain sand and larger fragments erode the shoreline or seacliffs. This removes material resulting in undercutting and possible collapse of unsupported overhanging cliffs 4.Corrosion=solution/chemical weathering occurs when the sea corrodes rocks on a cliff face. Limestone cliff faces, which have a high pH, are particularly affected in this way. Wave action also increases the rate of reaction by removing the reacted material. The hardness or ‘erodibility’ of sea-facing rocks is controlled by the rock strength and the presence of fissures, fractures, and beds of non-cohesive materials such as silt and fine sand. The rate at which cliff fall debris is removed from the foreshore depends on the power of the waves crossing the beach. This energy must reach a critical level to remove material from the debris lobe. Debris lobes can be very persistent and can take many years to completely disappear. Beaches dissipate wave energy on the foreshore and provide a measure of protection to the adjoining land. Primary factors azure window BEACHY HEAD, EASTBOURNE, SUSSEX Secondary

1.Weathering and transport slope processes
2.Slope hydrology
4.Cliff foot erosion
5.Cliff foot sediment accumulation
6.Resistance of cliff foot sediment to attrition and transport
7.Human Acivity
Tertiary factors

1.Resource extraction
2.Coastal management
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