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Erstellt von kat1jj
vor mehr als 11 Jahre
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intertidal- high tide covered by water, low tide- exposed land
backshore- never covered by water
what determines the wave size?
the distance the wave travels and the strength of the wind.
(THE FETCH)
SWASH= water runs up the beach/ shore
BACKWASH=water returns to sea.
constructive wave-
smaller in height= less energy
strong swash- pushes material up the beach. weak back wash- little erosion.
destructive waves-
very tall- a lot of energy
weak swash- little beach building
strong backwash- pulls sand/shingle down beach= starves beach
air gets forced into rocks from the water (strong waves)
rocks eventually - explode/break/fall off
EROSION
hydraulic power- the sheer power of waves
abrasion- sand paper effect
weathering
PHYSICAL- water freezes in cracks, the ice expands, rock shatters.
CHEMICAL- weak acid in rain, dissolves limestone+chalk
mass movement- a movement of material down slope