Written questions Flashcards
What are the advantages of the location? (Skills)
- proximity to school
- permission to use the river
- ease of access
- health and safety assessed
- public phone boxes
- car park for minibus
What is the river called and where is it located? (Skills)
River Gryne Frawr in the Black mountains, South Wales
Which model were the aims? (Skills)
To investigate how river characteristics change with distance downstream in line with the Bradshaw model to test its validity
Why does velocity increase downstream? (Skills)
Frictional drag on the bed and the banks is reduced as channel efficiency increases downstream
What two parts of the Bradshaw model did we look at? (Skills)
- Velocity
- Load particle size and shape
- River width and depth
How many points along the river did we analyse? (Skills)
- 5 points
- 1 km apart from each other
What things did we need to carry out a risk assessment on? (Skills)
- Accessible by footpath
- Being struck by an object e.g car
- Hypothermia
- Drowning
- Near public phones
How did we reduce the risk of hypothermia? (Skills)
- Analysed hazards from home
- Took enough warm clothing
- Wore full set of high quality waders
What primary data collection did we use and how does it work? (Skills)
- Velocity
- Electronic flow meter
- Submerged 6 inches from surface
- 50 cm intervals across river channel
- 2 minutes duration
- Time recorded on a stopwatch
How did we measure the cross sectional area of the river? (Skills)
- Tape measure to measure width from where the dry bank met the water at corresponding sides
- Ranging poles to keep in place
90 degrees to the flow of the river to stop drag - 20 cm above water line
- 50 cm intervals measured depth with meter rule
What is the dog biscuit method and what is the evaluation of it? (Skills)
(Measures velocity, time with stop watch)
+ Cheap
+ Easy
+ Environmentally friendly
- Crumbled
- Hard to see
- Different shapes/densities
- Only measured surface velocity
- Only measured at 3 points
How could the dog biscuit method be improved? (Skills)
Use an electromagnetic flow meter
What secondary data did we use? (Skills)
- Co-ordindates on an OS map
- Downloaded via www.googlemaps.com
- Could identify the area and study characteristics
- National Flow Archive (NFA) and Met Office
- Obtain discharge data
- Obtain rainfall data
- Compared our weather to previous years
How was the angularity of the pebbles measured? (Skills)
- Mixture of random samples
- 50 cm away from bank
- Compared on the Power’s index
How was our data displayed and evaluate it? (Skills)
Scatter graph
+ Easy to read
+ Show anomalies
+ We only had two sets of data at a time
Later used spearmans rank
Null hypothesis
Correlation coefficient of 0.8
Degrees of freedom = 95% significance
