Coastal Controlled Assessment Prep

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?