10.3 Coastal erosion processes Flashcards
What are 5 process of coastal erosion?
➢ Solution ➢ Corrasion ➢ Hydraulic power ➢ Abrasion ➢ Attrition
What is hydraulic power?
➢ Power of the waves as they smash onto a cliff
➢ Trapped air is forced into holes and cracks in the rock eventually causing the rock to break apart
What is solution?
➢ The dissolving of soluble chemicals in rocks
What is Corrasion?
➢ Fragments of rock are picked up and hurled by the sea at a cliff
What is attrition?
➢ Rock fragments carried by the sea knock against one another causing them to become smaller and more rounded
What is abrasion?
➢ Pebbles and rocks grind over a rocky platform often causing it to become smooth
What are the 4 ways that sediments can be transported in four different ways?
➢ Solution
➢ Suspension
➢ Saltation
➢ Traction
What is solution?
➢ Dissolved chemicals often derived from limestone or chalk
What is suspension?
Particles are carried within the water
What is Traction?
➢ Large pebbles roled along the seabed
What is Saltation?
➢ Bouncing motion of particles too heavy to be suspended
What is longshore drift?
➢ When waves approach at an angle towards the beach
➢ Sediment will be moved along the beach in a zigzag pattern
How does longshore drift work?
➢ Waves approach the beach at an angle
➢ The swash carries sediment up the beach
➢ Sediment carried back down as the beach waves draws back
➢ Process is repeated
Why does coastal deposition take place in areas where the flow of water slows down?
➢ Waves lose energy in these areas so they deposit the materials
