Coats Flashcards
Abrasion
Pebbles and sand getting flung against the rocks
Attrition
Rock fragments flung against each other
Solution
Water dissolves some material
How is a headland and bays made?
Headlands are formed when the sea attacks a coast hard and soft rock.The bands of soft rock, such as sand and clay, erode more quickly than those of more resistant rock, such as chalk. This leaves a section of land jutting out into the sea called a headland. The areas where the soft rock has eroded away, next to the headland, are called bays.
Traction
Rocks are dragged along sea bed
Saltation
Smaller boulders are bounced along the sea bed
Suspension
Materials such as sand grains are light enough to be carried along the water in suspension
Solution
Lime from chalk dissolves and is carried in water
What is longshore drift?
Waves that hit the beach at an angle carry sand and gravel up the beach face at an angle. When the water washes back the sediment is carried straight back down the beach face. Individual particles are moved along the beach in a zig zag pattern. This is called longshore drift.
How is a spit formed?
Spits are also created by deposition. A spit is an extended stretch of beach material that projects out to sea and is joined to the mainland at one end.
Spits are formed where the prevailing wind blows at an angle to the coastline, resulting in longshore drift.
What is a tombolos?
Is a spit connecting the island to the mainland
Coastal erosion at Mappleton
The village of Mappleton on top of the Holderness coast eroded quickly because of soft clay and strong winds causing longshore drift.
What is a groyne?
Is barrier used to trap sand and sediment from being moved down a coastline
Wave angle equation
Wave angle=tan^-1(longshore distance/swash distance)
Starvation and acclamation in terms of groynes
One side of a groyne starves the other accumulates
