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Coastal Geomorphology,[object Object],The shape of the coast and its landforms is a direct result of:,[object Object],Geology + Marine processes + Sub-aerial processes + Man + (Climate),[object Object]
Marine processes,[object Object]
Constructive waves,[object Object],These are depositional waves as they lead to sediment build up, and are most common where a large fetch exists. ,[object Object],They tend to have a low gradient, a larger swash than backwash, low energy and an elliptical orbit. ,[object Object],The wave period is long, with 6-8 waves breaking in a minute.,[object Object]
Destructive waves,[object Object],These act as agents of erosion, because backwash is greater than swash. ,[object Object],They are most common where fetch is short, have a mainly circular orbit, a steep gradient, and 'plunge' onto the beach. ,[object Object],The wave period is short, with 12-14 waves breaking per minute.,[object Object]
Wave definitions,[object Object],Wave fetch: The distance of open water over which a wave has passed. Maximum fetch is the distance from one coastline to the next landmass, it often coincides with prevailing wind direction (South West in the UK).,[object Object],Wave crest: Highest point of a wave.,[object Object],Wave trough: Lowest point of a wave.,[object Object],Wave height: Distance between trough and crest.,[object Object],Wave length: Distance between one crest/trough and the next.,[object Object],Swash: Water movement up a beach.,[object Object],Backwash: Water movement down a beach.,[object Object]
Wave refraction,[object Object],It is very rare for waves to approach a regular uniform coastline, as most have a variety of bays, beaches and headlands.,[object Object],Because of these features, the depth of water around a coast varies and as a wave approaches a coast its progress is modified due to friction from the seabed, halting the motion of waves.,[object Object],As waves approach a coast they are refracted so that their energy is concentrated around headlands but reduced around bays. Waves then tend to approach coastline parallel to it, and their energy decreases as water depth decreases.,[object Object]
Summary of coastal erosion processes,[object Object]
Coastal erosion,[object Object],Abrasion/corrasion:,[object Object],When waves approach the coastline they are carrying material such as sand, shingle, pebbles and boulders. Abrasion occurs when this material is hurled against cliffs as waves hit them, wearing the cliff away.,[object Object],Hydraulic pressure:,[object Object],Cliffs and rocks contain many lines of weakness in the form of joints and cracks. A parcel of air can become trapped/compressed in these cracks when water is thrown against it. The increase in pressure leads to a weakening/cracking of the rock.,[object Object],Corrosion/solution:,[object Object],Seawater contains carbonic acid, which is capable of dissolving limestone. The evaporation of salts in seawater produces crystals and their formation can lead to the disintegration of rocks.,[object Object],Sub-aerial:,[object Object],Coastal erosional processes that are not linked to the action of the sea. Erosion occurs via rain, weathering by wind and frost. Its impact is often seen in soil creep, slumping and landslides.,[object Object],Human activity:,[object Object],Much building and recreation occurs at the coast, and this increases pressure on cliff tops, making them more liable to erosion and subsidence. The building of sea defences upsets the dynamic equilibrium of the coastline.,[object Object]
Influences on the rate of erosion,[object Object],The rate at which a stretch of coastline is eroded is related to the following factors:,[object Object],The point at which the wave breaks - (if at the foot of a cliff, the cliff is subject to maximum energy and most erosion).,[object Object],Steepness of the wave.,[object Object],Depth of sea, fetch, aspect.,[object Object],Amount of beach material - (a wide beach protects a cliff more than an arrow beach).,[object Object],Rock type and structure - (hard rock such as granite is far more resistant to erosion than soft rocks, such as clay).,[object Object]
The sub-aerial processes,[object Object]
Sub-aerial processes,[object Object],Sub-aerial processes = weathering + mass movement + humans*,[object Object],Weathering = physical + chemical,[object Object],Mass movement = falls + flows + slides + slumps + creep,[object Object],*Pressure on cliffs (construction work)Sea Defences (although designed to reduce erosion - in some instances (e.g. the use of groynes) can increase erosion by starving down stream areas of sediment,[object Object]
Weathering – basic summary,[object Object],Weathering Processes:,[object Object],Weathering is the breaking up of rock in situ ,[object Object],Freeze-thaw processes (as water freezes and thaws in cracks in cliffs, the expansion and contraction forces the rock open, making them more susceptible to the action of waves).,[object Object],Chemical weathering - water running down the face of cliffs, either from surface runoff from above or from rainfall can result in solution so that rock cracks are enlarged, leaving the remaining rock loosenedBiological weathering - burrowing organisms and roots of vegetation forces open cracks, making them more susceptible to wave erosion) [NOT sub-aerial]Human Activity,[object Object]
The weathering processes,[object Object],Physical Weathering ,[object Object]
The weathering processes,[object Object],Chemical Weathering,[object Object]
Sub-aerial processes,[object Object],Mass Movement,[object Object]
Cliffs – erosional landform,[object Object],Factors determining cliff formation,[object Object],Geological. ,[object Object],Sub-aerial. ,[object Object],Marine. ,[object Object],Meteorological. ,[object Object],Human activity. ,[object Object],The rule of thumb!,[object Object],Cliffs are steep if removal of material at its base is greater than supply.,[object Object],Cliffs are shallow if the supply of material is greater than removal.,[object Object]
Mass movement,[object Object]
Mass Movement,[object Object],This is a combination of a rockfall & earthflow,[object Object]
Types of cliff,[object Object]
Soft Geology Cliff,[object Object],Fairlight Cove is mostly softer unconsolidated rocks.,[object Object],These rocks are less resistant to erosion & landslips are common,[object Object],Typical of NE England,[object Object]
Coastal erosion cliffs etc
Cliff & Wave Cut Platform,[object Object],Wave attack constantly erodes the cliff base, creating a Wave Cut Notch.,[object Object],As the cliff is undercut, it collapses, leaving rockfalls on the beach below.,[object Object],As the cliff retreats it leaves behind a gently sloping platform – Wave Cut Platform,[object Object]
Coastal erosion cliffs etc
Rotational Slumping,[object Object],The full extent of (rotational) slumping can be seen on the west side of the cove.,[object Object]
Coastal transport,[object Object],Coastal Transport,[object Object],Weathering and erosion at the coast produces large amounts of material which is moved along the coast line and out to sea by the action of waves.Up and down the beach: Material is moved up the beach in the swash and back down the beach in the backwash. Constructive waves move large amounts of material up the beach as they have a strong swash, whereas destructive waves move large amounts of material down the beach due to their strong backwash.The movement of material by waves: The movement of material within the waves themselves depends on (i) the size of the material and (ii) the energy available for transporting the material. There are four possible types of transport within the water:Solution - material carried dissolved in the waterSuspension - fine material carried suspended within the water itselfSaltation - material which is too heavy to be continuously held in suspension is bounced along the sea bed.Traction - the heaviest material is simply rolled along the sea bed,[object Object]
Coastal transport,[object Object],1. Waves break on the beach at an angle controlled by the prevailing wind direction. Material is moved up the beach in the swash.2. Material then moves straight back down the beach in the backwash under the influence of gravity.3. As the processes continues material moves along the coast in a zig-zag movement.,[object Object]

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