Geography Coastal Change and Conflict 0.0 / 5 ? GeographyCoastal zonesGCSEEdexcel Created by: Sophie RussellCreated on: 19-05-13 14:36 What is the energy of the wave determined by? 1) The height (distace between trough and crest) 2) The Length (between two crests) 1 of 12 Features of destructive waves 1)High Erosion rates 2)Frequent waves 3)Stronger backwash 4)Steep and high 2 of 12 Features of constructive waves 1)Deposition of sediemt 2)Less frequent 3)Stronger swash 4)Long and flat 3 of 12 Hydraulic Action swash> Air and water are trapped and compressed in rock surface cracks>backwash>air expands>pieces of rock are blasted away 4 of 12 Attrition Rock fragments grind each other down into smaller pebbles 5 of 12 Abrasion Loose rocks are thrown against the base/bottom of a cliff and chip rock off 6 of 12 Process of longshore drift Movement of material along a beach. Swash approaches at an angle> pushes sediment with it> backwash drags material back into the sea. ZIGZAG SHAPE 7 of 12 What does the size of a wave depend on? The strength of the wind, how long the wind blows for, the length of the fetch 8 of 12 Concordant Coastline example LULWORTH COVE DORSET. Only one rock type parrallel to the sea. 9 of 12 How Lulworth Cove formed 1) Hydraulic action and abrasion eroded gas and cracks in the rock 2) Punched through the rock 3)Soft rock behind it quickly erodes 10 of 12 Discordant coastline example OLD HARRY ROCKS SWANAGE DORSET. rock strata perpendicular to the sea 11 of 12 How Old Harry rock formed Headlands are made of resistant rock, softer rock next to it erodes quicker forming bays. 12 of 12
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