What are high energy coasts?

Different stretches of the coastline can be put into two different categories: high energy coasts and low energy coasts.

High energy coasts

  • waves are powerful (for a significant part of the year)
  • the rate of erosion exceeds the rate of deposition
  • characteristic landforms include headlands, cliffs and wave-cut platforms

Low energy coasts

  • waves are not powerful (for a significant part of the year)
  • the rate of deposition exceeds the rate of erosion
  • characteristic landforms include beaches and spits

What questions do geographers ask?

You can ask geographical questions about anywhere on the coast. Here are some examples.

Hilbre Island
High energy coast. Little Hilbre From Hilbre Island by Andrew / CC BY.
  • What coastal processes are happening here?
  • What factors determine the shape of the cliffs and shore platform?
  • How will this coastline change in the next 20 years?
Lannacombe Bay
High energy coast. Lannacombe Bay by John Bointon / CC BY.
  • What coastal processes are happening here?
  • Why is the shore platform neither smooth nor flat?
  • How does wave action vary along this length of coast?
Holderness
High energy coast. Cliff erosion on Holderness by Bryan Ledgard / CC BY.
  • What coastal processes are happening here?
  • Is there a link between beach width and cliff height?
  • What is the threshold event for cliff collapse?

Visit the BBC website to find photos of a rock arch and stack before and after the winter storms of 2013/4 http://www.bbc.co.uk/news/uk-25637142. What is the threshold event for this collapse? Could you investigate any other examples?

What questions could you investigate by fieldwork?

Here are some examples. Each research question has been split into 2 or 3 sub-questions.

Research questionSub questions
Why is there an uneven distribution of erosional landforms in the coastal landscape at x?Where are erosional landforms (like cliffs, wave-cut platforms, headlands and bays, arches and stacks) found in the landscape at x? Is the rate of erosion linked to rock type (hard rock/soft rock) and structure (faults, joints and bedding planes)? Is the rate of erosion linked to wave power?
How and why do cliff profiles vary along the coast at x?How does the height, gradient and shape of cliffs, shore platforms and wave-cut notches vary along the coast? To what extent is the cliff profile controlled by rock type and structure? Is there a link between cliff gradient and the width of the beach or wave-cut platform?
How and why does wave action vary between headlands and bays at x?How does wave size, angle of approach and frequency vary between headlands and bays? Is there a link between wave action and the distribution of erosional and depositional landforms?

Specialised geographical concepts

A good way to demonstrate challenge in your choice of research question and/or sub questions is to consider one or more of the specialised geographical concepts. Here are a few suggestions:

Specialised conceptResearch question or sub question>
CausalityTo what extent do wave characteristics affect landforms at x?
CausalityWhat is the relationship between the rate of erosion and the resistance of the rocks?
EquilibriumIs the beach at bay x an equilibrium form?
FeedbackIs there a negative feedback relationship between wave energy, cliffs and wave-cut platforms at x?
RiskWhat factors put the cliffs at x at risk of rapid erosion?
ThresholdWhat is the threshold storm event for cliff failure at x?

Choosing a fieldwork location

Find a 2-5km stretch of coast, with some variation in physical factors (such as rock type or aspect). Makes sure that there are several safe access points; this reduces the risk of being stranded by the rising tide. Alternatively you could investigate coastal processes in a smaller area (such as a single zeta-form beach in a bay) in more detail.

A possible fieldwork location. Little Hilbre Island (Cheshire) by Google Earth / ESRI, Imagery ©2016 Getmapping plc, Map data ©2016 Google.

Hilbre Island (Cheshire) is an example of a possible fieldwork location. The length of perimeter approx 2km. It can be reached at low tide by walking from the mainland. Safe access points to the shoreline at several points around the edge. Is there a relationship between aspect and the rate of erosion? What other factors are important?


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