GCSE: Geography B Coasts


  • Headlands
  • Spit
  • Bars
  • Longshore Drift
  • Destructive waves
  • Constructive waves
  • Wave cut platform
  • Cosatl Managmenet 
HideShow resource information
  • Created by: Shannon
  • Created on: 04-12-12 14:29
Preview of GCSE: Geography B Coasts

First 287 words of the document:

Four processes of erosion
Hydraulic action ­ Force of waves which cause the cliffs to crack, break apart and erode
Abrasion ­ Powerful waves pick up stones and throws them against the base of the cliff
which attacks the cliff over time
Attrition ­ Stones smash into each other and break apart as the sea carries them. They slowly
get smaller and rounder
Corrosion/Solution ­ Chemicals in sea dissolve rocks such as chalk and limestone
Destructive waves
High and steep
Backwash > Swash (Materials removed from coast)
Factors that affect the size and power:
o Wind ­ Strong wind = large powerful waves
o Fetch ­ Strong fetch = bigger and more powerful waves
Constructive waves
Deposit more materials than they erode
Low and long
o Swash carries material to coast
o Backwash doesn't take a lot of material back down to coast = deposited
Weaker winds and shorter fetch than destructive
Wave cut platform
Waves attack the base of cliff
Cliff under cot and wave cut notch forms, this enlarges as erosion continues cliff above notch
becomes unstable and collapses
Collapsed material is washed away and a new wave cut notch forms
Repeated collapsing results in cliff retreating
Wave cut platform is the platform left behind as the cliff retreats
Rate of retreat
Soft rock = quick retreat
More vegetation = more stable = less erosion= slow retreat
Resistant rocks with cracks ­ enlarged by waves crashing
Repeated erosion and enlargement of cracks cause a CAVE to form
Erosion breaks through the headland forming an ARCH

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Rock supporting arch wears way forming a STACK
Stack worn away to give a STUMP which can be covered by high tides
Longshore Drift
Material is transported along coasts
Waves follow the direction of the prevailing wind
Hit coast as an oblique angle
Swash carries material up the beach in the same direction as the wind
Backwash carries material down the beach at right angle, back towards the sea
Beaches that stick out in the sea.…read more

Page 3

Preview of page 3

Here's a taster:

Sea Wall Reflects waves Prevents erosion Expensive. Strong
barrier to flooding Backwash = Erosion
Rip Rap Boulders Absorb wave energy Moved around by
strong winds
Groynes Right angle, trap Wider beaches = Starve beach as
materials from LSD slower waves narrow which means
poor protection =
Rip Rap Armour Foot of cliff Absorb wave energy Expensive.…read more


No comments have yet been made

Similar Geography resources:

See all Geography resources »See all resources »