Coasts Flashcards
Abrasion?
When pebbles scrape along rock/land like sandpaper.
Attrition?
Rocks that sea is carrying knock against each other. Break apart, become smaller and more rounded.
Hydraulic action?
Sheer power of waves. Air becomes trapped in the crack of rocks and causes rock to break.
Solution?
Sea water dissolves certain types of rocks.
Suspension? (trans)
Fine material such as clay and sediment is carried by the sea.
Solution? (trans)
Dissolved minerals carried by the sea.
Traction? (trans)
Large pebbles and boulders rolling along the seabed.
Saltation? (trans)
Small pebbles, stones and slit bounces along seabed.
Spits?
- Extended stretch of beach material.
- Found where there is break in coastline. (rover mouth, where coastline changes direction)
- Spits are curved sometimes.
- Have bits of hooked shaped land sticking off them.
Recipe for waves?
- wind
- Sea
- Strength
- Distance
- Fetch
- Time
LSD?
🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩
🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩
→→→→→→→ Direction of LSD
Swash➚ ↓ back wash ➚ ↓➚ ↓➚ ↓
🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦
➚ prevailing wind🟦🟦🟦🟦🟦🟦🟦
🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦
Headlands and Bays?
- form along discordant coastlines where there are alternating bands of more resistant + less resistant rock at right angles to coast.
- forms u-shaped areas of the coast called bays which usually have a beach because of less wave energy.
- areas of resistant rock erode slower and are left sticking out into sea.
Wooden revetments?
- Stops power of waves.
- Made of wood
- shaped like a right angled triangle.
- break easily
Rock armour?
- Big rocks around the beach
- absorb energy of waves
- very strong
Sea wall?
- made of concrete.
- curved shape.
- stops flooding of land.
- there are rocks in front of it to help.
- very strong + expensive.
