Coasts Flashcards
What are constructive waves?
In a Constructive wave, the swash is stronger than the backwash. Constructive waves are created in calm weather and are the weaker wave out of the two. Constructive waves build up the beach which is known as Coastal Deposition. They also have a low wave in proportion to length.
What are destructive waves?
These are the opposite of constructive waves. They have a stronger backwash than swash and are created in stormy conditions. Destructive waves tend to erode the coast and occur when the wave energy is high and the fetch is low.
What impact do Destructive Waves have on the coastline?
They have many negative impacts on the coastline. Name an example like Pagham and talk about what has happened. Destructive waves have taken away the beach and created a spit. Millions of pounds has been spent on the beach to stop houses being washed away. The sea has got even closer even though defences like Rock Armour and Sandbags have been put up.
What impact do constructive waves have on the coastline?
Constructive waves have a positive impact on the coastline. They build up the beach which is known as coastal deposition. Constructive waves can not do what destructive waves do.
Name the three different processes of Coastal Weathering
Physical or Mechanical, Chemical and Biological Weathering.
What are waves?
Waves are the movement of water molecules within the ocean. The size of the wave is influenced by how long the wind has been blowing. The fetch is which is the strength of the wind and how far the wind has travelled.
What is Physical weathering?
Physical is the result in mechanical disruption of rocks.
What is Chemical weathering?
The second process, Chemical, is caused by solution, hydration, oxidation and carbonation. Chemical weathering is the decay of rock forming minerals.
What is biological weathering?
This is very different to the other two processes. Biological weathering is the presence of vegetation, which is the production of acids.
What is Longshore Drift?
The process where sand and pebbles are moved along a beach by the movement of waves.
What is wave refraction?
Friction with the sea bed as waves approach the shore causes the wave front to become distorted or refracted as velocity is reduced.
What are the distinctive landforms resulting from deposition?
Beaches , Spits , Bars, Tombolo
What types of coastal management are there?
Sea wall, Groynes, Rock Armour, Gabion, Offshore Break Water and Revetment.
Name the three landforms caused by erosion
Cliffs and wave cut platforms, Headlands and Bays and Cave, arches and stacks.
How is an Headland and Bay formed?
The headlands are formed when sections of cliff that are particularly resistant to erosion, stick out and form headlands. Bays are then formed when a weaker section of a coastline erode easily.
