Coasts Flashcards
What is attrition
Rocks knock against each other wearing each other away
What is abrasion
When rocks hit against the cliffs wearing them away
4 types of transportation
Solution, traction, suspension, saltation
What is traction
Rocks rolling along sea bed
What is saltation
Rocks bounced along sea bed
Types of mass movement
Rock fall , mud flow , slumping , landslide
Factors that determine wave size
Strength of wind
Fetch
Length of time the wind blows
Differences between constructive and destructive waves
Constructive = low energy, slash stronger than backwash, deposition greater
Destructive = high energy, backwash stronger than swash, erosion greater
3 types of weathering with examples
Biological = animals burrowing in rocks
Physical / mechanical = freeze thaw, water freezing in cracks in rocks then melts and breaks rock
Chemical= oxidation, oxygen breaking down rocks over time
Hard engineering charecteritics
High tech
High cost
Man made
Bad for environment
Aren’t sustainable
Soft engineering solutions
Low tech
Low cost
Work with nature
Not as effective
Sustainable
What is concordant coastlines
Have the same type of rock along its length
Tend to have fewer bays and headlands
Such as lulworth cove
What is discordant coastlines
Where the rock alternates bands between hard and soft rock
What is a tombolo
Ridge of sand or shingle connecting an island to mainland
What is a bar
Where a spit extends fully across a bay and connects two pieces of land together
Form a lagoon behind it
