Rivers Fieldwork Flashcards
How long is the river wye?
17 km (11 mi)
What is the elevation of the wye from source to mouth?
68m
What is unique about the river?
It is a chalk stream
Describe one fieldwork method the students could have used to collect data to investigate this river.
One possible data collection method the students could
have used is measuring the width of the river placing a
tape measure either side of the riverbanks at different
sites while ensuring it is taut.
One possible data collection method the students could
have used is measuring the depth of the river placing a
metre ruler at 10 equal intervals sideways along the width of the
river.
Candidates could have measured discharge of the river by
using a tape measure to measure the width of the river (1)
and the velocity of the river by using a flowmeter (1)
Suggest one way students could have used a flood risk map to investigate this river.
The flood risk map could have been used to investigate
the areas of the channel at high risk of flooding (1)
allowing groups to pre-plan survey sites (1) to ensure
data could be collected safely (1)
You have studied a river as part of your geographical investigation.
Evaluate the effectiveness of the different techniques used to present your
fieldwork data.
How did we investigate velocity using a flowmeter?
Use flowmeter 3 times along the width of a channel,facing it upstream so the propellor actually moves.
Use an accurate stop watch while seeing how long it takes for the propellor to be moved to the end of the hydroprop
What were problems with our field work?
We only surveyed 2 locations and too much people were in the river which could effect results.
What conclusions can be made?
Width and Depth and Discharge(figured from the volicty) increases downstream while bedload decreases
What model can the conclusions match with?
Bradshaw model
What were some limitations on Width and Depth
Tape measure was not taught and could be obstrcutted by vegetation or it could be pulled downstream
Depth measured could be at places where river bed isnt even and the metre ruler could be pushed in the sediment?
What are 3 methods of sampling?
Random- data is collected by chance- no bias but can cause uneven results and probably can result in sites with hazards
Systematic-Location of the sites at equal distances to each other
Stratified-dividing sampling into groups, there may be bias but it can avoid hazards
What was the field sketch for
river landforms
width and depth
show contrast
3 quantitative methods and 1 qualitative method:
Depth Width Velocity- Quantitative
Field sketch-Qualitative
How measured bed load?
Annotated photograph
