coasts 0.0 / 5 ? GeographyCoastal environmentsASAQA Created by: siobhanCreated on: 01-04-14 20:28 What causes waves? Wind causing frictional drag across the surface of the water 1 of 16 What is the fetch? The distance across which a wave travels 2 of 16 What factors influence the power of a wave? Length of the fetch, strength of the wind,duration of the wind 3 of 16 What is wave frequency? The number of waves per minute 4 of 16 what is the waver period? time taken for one wave to pass a given point 5 of 16 what are the features of a constructive wave? Strong swash- focus of energy is horizontal, weak backwash- wave energy is gone, shallow wide sandy beaches, longer wave length, shorter wave height 6 of 16 what are the features of a destructive wave? focus of swash is vertical- scours the beach, strong backwash- removes sediment, shorter wavelength, greater wave height, steep shingle/pebble beaches 7 of 16 What is wave refraction? a bending of the wave crest to fit the coastline 8 of 16 What is a sediment cell a length of coastline in which sediment is transferred 9 of 16 name sources of sediment in a sediment cell erosion of headlands/cliffs, alluvial input from rivers 10 of 16 name sediment sink in a sediment cell beaches, bars, spits, salt marshes, off-shore bars, sand dunes 11 of 16 What are tides? regular changes in sea level that occur over a 24 hour period 12 of 16 What causes tides? the gravitational pull of the moon, the sun, and the earth spinning on its axis 13 of 16 name the types of tide in order of height, highest first spring high tide, mean high tide, neap high tide, neap low tide, mean low tide, spring low tide 14 of 16 what is mean tidal range? the mean difference in sea level between mean high tide and mean low tide 15 of 16 what is the maximum tidal range? the difference between spring high tide and spring low tide 16 of 16
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