Transcript
Controlled Assessment Task 1Controlled Assessment Task 1Due: 28Due: 28thth June June
Fieldwork Focus : Coastal Management
What can you remember about coasts?
Erosion?
Landforms?
Use by people?
Management?
You will need to be able to do this:
Q: “With the use of a diagram, explain the process and effects of longshore drift, and how it can be managed”
How many of these coastal landforms can you spot?
ARCH
STACK
CAVE
WAVE CUT PLATFORM
STUMP CLIFF WAVE CUT NOTCH
COLLAPSED ARCH
BAY
HEADLAND
SPIT
Types of coastal erosion
Erosion is……. the wearing away of materials by one of four processes:
Corrosion = chemical reactions of salt water weakening rocks like an acid
Attrition = Pebbles hitting into each other or into cliffs making rocks break and get smaller and rounder
Abrasion = ‘sand paper’ effect. Waves throwing small stones and pebbles at cliffs and beaches to smooth the material
Hydraulic Action = Power of the water forcing its way into cracks and weaknesses in rocks, splitting apart
Exam Q
• Including keywords where possible, describe and explain how erosion can influence the coast. You may use a diagram.
[3marks]
The main landforms created by erosion are…
Headlands and Bays
Wave cut notches and platforms
Wave erosion is greatest when waves break against the foot of the cliff.
With wave energy at a maximum, the waves undercut the foot of the cliff to form a wave cut notch
Over time the notch enlarges and the cliff above it cannot be supported and so collapses
As this is repeated, the cliff retreats (and often increases in height). The gently sloping expanse of cliff marking the foot of the retreating cliff is known as the Wave cut platform
Does this remind you of anything?
Waterfalls and gorges – very similar ideas!
Wave-cut platform –Burgh Island, Devon
Wave cut platform Southerndown, South Wales.
Caves
Arches
Stacks
and
Stumps
How was the arch at Durdle Door, Dorset, formed?
Abrasion/Corrasion
Hydraulic action
Solution/Corrosion
Attrition
1. The waves erode FAULTS (cracks) in the headland.
2. The waves eventually erode through the headland to form an ARCH.
3. The arch becomes unsupported and collapses to form a STACK.
4. A STUMP is formed from the collapsed stack.
C DBA
Match the image with the most appropriate label.
Exam Q
• How does geology influence the speed of erosion at the coast?
[2marks]
What about waves?
If you were a wave, and you wanted to grow big and strong so you could knock the UK’s block off, which direction would you come
from? Why?
Waves
• There are two main types of waves:• Constructive vs Destructive
Exam Q
1) Describe and explain how constructive and destructive waves work. Use keywords or examples where possible. [4marks]
2) Apart from the strength of waves, name and explain another factor that can influence how quickly a coastline erodes? [2marks]
How do waves influence How do waves influence erosion?erosion?
Longshore drift
Long-shore drift (LSD)
Longshore drift…starring Mr R.
• Longshore drift video explained by Mr Rogers
So, answer the Question:
Q: “With the use of a diagram, explain the process and effects of longshore drift, and how it can be managed”
[6marks]
So, the controlled assessment
How does it work?
Example controlled assessments from last year
• Take a look at what you will be producing
• You will have prep time before the trip, then the trip on 11th May, then the analysis afterwards
• Key things = keywords, theory, analysis, explanation, evaluation
Example checklist
What does the markscheme look like?
How will you be marked?
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