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6 Cards in this Set
- Front
- Back
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Wavecut platform & cliff erosion |
Waves break against a cliff (high tide) Erosion wears away the cliff forming a wave cut notch The notch gets deeper undercutting the cliff Cliff can no longer support itself and collapses Weathering above is weakening the cliff Overtime, the cliff retreats A gently sloping, rocky platform is visible (at low tide) |
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Slumping |
Physical weathering e.g. rain causes water to infiltrate the permeable gravel Water also permeates the permeable Barton Sands The clay is impermeable as its particles are so compact Water is trapped between the impermeable clay and the saturated sand creating a slipping plane The slump occurs as the gravel and sand are over saturated and top heavy and the clay is slippery Other forms of weathering/erosion are weakening the cliff above and below |
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Longshore drift |
The swash acts in the same direction as the prevailing wind Beach material is moved up the beach to its new position Backwash brings the material back out to sea at 90° to the shore due to gravity The process is repeated so that the material is moved along the beach |
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Spit |
Longshore drift causes material to move along the coastline The spit starts to form as material is deposited If the wind's direction moves further out or a stronger prevailing wind combats the second the hook develops Waves cannot get past the spit creating a sheltered area where silt is deposited Overtime, these form mudflats or salt marshes which develop into land |
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Sand dunes |
Embryo dunes form around deposited obstacles e.g. wood or rocks These develop and stabilise by vegetation forming foredunes and tall yellow dunes Marram grass is adapted to windy exposed conditions and has long roots that help bind the sand together (stabilising the dune) Rotting vegetation makes the sand fertile allowing a vartiety of plants to growWind can form depressions in the dunes slacks causing ponds to form Wind can form depressions in the dunes slacks causing ponds to form
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Bar |
A spit develops in a bay where no major river flows Longshore drift causes it to build across two headlands- linking them to form a bar Water is trapped behind the bar forming salt marshes or lagoons |
