New Geography in Action Junior Cycle Geography 10 Waves Learning Intentions
zzhow waves are formed zzthe different types of waves that can be formed zzhow waves erode the coastline.
Fetch Swash
Backwash
Constructive waves Destructive waves Compression
The sea is constantly shaping the coastline. Waves erode, transport and deposit material along the coast.
Waves are formed by wind moving across the surface of the sea. The distance of open sea over which the wind blows is called the fetch. Waves with a greater fetch are stronger.
When waves reach shallow water, the front of the wave comes in contact with the seabed, causing it to break as it moves towards the shore.
When a wave breaks, the water that rushes up the beach is known as the swash. The water that returns back down the beach is known as the backwash.
how waves erode, transport and deposit material along the coastline why erosion occurs in some places and deposition in others how landforms of coastal erosion and deposition are formed how people interact with the sea how human interaction affects coastlines how to recognise coastal landforms on Ordnance Survey maps.
ICE-BREAKER ACT VITY
Look at the shape of the west and east coastlines on the map of Ireland on page 411. In what ways are they different? Can you suggest reasons why?
