Abraison: Bits of rock and sand in waves grind down cliff surfaces like sandpaper.
Attrition: Waves smash rocks and pebbles on the shore into each other, and they break and become smoother.
Hydraulic Action: Air may become trapped in joints and cracks on a cliff face. When a wave breaks, the trapped air is compressed which weakens the cliff and causes erosion.
Solution: Acids contained in sea water will dissolve some types of rock such as chalk or limestone.
Constructive Waves: If the swash is stronger than the backwash - Material is carried on to land and deposited. = Low waves, run Gently up the beach.
Destructive Waves: If the backwash is stronger than the swash - the waves erode the coastline. = High/Steep wave, crashes down on beach.
- Is the movement of Material along a coastline by the action of the waves.
- Most frequent wind dirrection.
-Groynes - trap sediment on the beach.
Wave Cut Platform & Notches [Case Study of Land f
- Cliffs are shaped by Eroision and Weathering.
The Process of a Wave Cut Platform - Seven Siter Cliffs in Sussex:
- Weather weakens the top of the cliff.
- The sea attacks the base of the cliff forming a wave-cut notch - Hydraulic Action and Abraison.
- The notch increases in size causing the cliff to collapse.
- The backwash carries the rubble towards the sea forming a wave-cut platform.
- The process repeats and the cliff continues to retreat.