Paper 3 - Fieldwork Flashcards
Physical enquiry question/hypothesis:
River meanders are faster and deeper on the outside bend
Human enquiry question/hypothesis:
The development of modern industry has had a positive impact on Canary Wharf
Wave count (coasts)/River velocity (rivers)
- gives an indication of the river/wave energy,
-whether erosion or deposition is occurring.
.
River velocity
can be measured by timing the journey of a float, or using a flow meter.
By counting the number of waves in a minute,
you can judge whether they are constructive or destructive (constructive = 6-8 per minute; less frequent
destructive = 10-14 per minute)
Wave count (coasts)/River velocity (rivers) - Strengths:
Provides quantitative data that is easy to present and analyse.
Can easily be repeated to provide an average.
Limitations:
Results vary greatly depending on weather conditions and/or time of year.
Measuring sediment size e.g. river load, beach sediment
done at spaced intervals along the river/coastline to assess changes.
- use a calliper to help measure accurately
Strengths: Measuring sediment size e.g. river load, beach sediment
Provides quantitative data that is easy to present and analyse.
Generally accurate (although angular rocks can be difficult to measure)
Limitations: Measuring sediment size e.g. river load, beach sediment
Relies on samples rather than measuring every piece of sediment. This can produce skewed/distorted results, especially if personal bias means some sediment is favoured over others (e.g. less muddy rocks!)
Channel survey/beach profile
This involves measuring the width and depth of the river channel or beach e.g. using measuring tape/metre ruler. This is typically done at several intervals along the river/coastline to assess changes.
Channel profile:
This can be used to test the theory that the river becomes deeper and wider along its course.
Beach profile:
A narrow, steep beach indicates erosion is taking place. A wide, flatter beach indicates deposition is more dominant.
A ‘clinometer’ is used to measure the angle of the beach. It can also be used to measure the gradient of valley sides.
Strengths:
Provides quantitative data that is easy to present and analyse.
Limitations:
You might only have the time to visit one site along the river/coastline, in which case you are unable to assess change.
Results might vary at different times of year. For example, in winter months, a beach will likely be more eroded due to stronger winds.
Strengths: Channel survey/beach profile
Provides quantitative data that is easy to present and analyse.
Limitations: Channel survey/beach profile
You might only have the time to visit one site along the river/coastline, in which case you are unable to assess change.
Results might vary at different times of year. For example, in winter months, a beach will likely be more eroded due to stronger winds
Species count e.g. using a Quadrat
This involves counting the number of species within a fixed area (e.g. types of tree, insects, birds). This gives an indication of biodiversity levels.
Quadrats can also be used to assess plant cover and/or the amount of footpath erosion taking place.
- estimate the % of plant cover or erosion with reasonable accuracy.
species count Strengths:
Provides quantitative data that is easy to present and analyse.
10x10 quadrats help to measure % with reasonable accuracy