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What is an anomaly?
- A piece of data which doesn't fit a trend found in the rest of the data
- anomaly in our investigation: Beenleigh (7th site) a velocity of 1.550m/s - the only drop in velocity along long profile
- Anomalies suggest other factors influenced the variable been investigated
What were the sites where we collected primary data?
- Harbourne Head (upper)
- Harbourne Ford (middle)
- Rolster Bridge (lower)
Explain how you responded to risks during the fieldwork investigation
- Carried out risk assessment before going to river
- Identified risks such as trips, slips, falls
- Used the formula 'severity x liklihood = risk'
- Severity was measured on a scale of 1-5, showing risks ranging from minor to life threatening and the likelyhood on the same scale.
- If the score was above 8 we took steps to mitigate the risk.
- being hit by a vehicle = 5/5 risk and 3/5 likelihood would score 15
- Mitigating steps included looking and listening before crossing road and listening to warnings from teachers and students
Describe one application of ICT skills you used in carrying out your fieldwork and comment on its effectiveness (8)
- We recorded data in the field directly onto waterproof iPads
- This reduced the chance that our data would be mistyped when trying to understand handwritten notes
- Saved us time as data could be immediately uploaded to an excel spreadsheet, so we could instantly analyze it
- Once uploaded our data could be tabulated, the spreadsheet allowed us to calculate figure means of larger samples and directly calculate discharge, cross-sectional area and hydraulic radius for us to analyze and interpret
- This saved time and reduced human error in calculation process
- Spreadsheet enabled us to quickly produce a range of graphs
- This allowed us to collect and analyze results within the same day
Describe a method of data collection you used (5)
Discuss the strengths and weaknesses of a method of data collection you used (8)
Summarize your findings and suggest how this enquiry could be improved
- As the R. Harbourne moved downstream, the velocity increased.
- Initially the velocity 0.66km from the source was 0.139m/s.
- Compare this to the velocity at the last site, 19.2km downstream, measured at 2.282m/s.
- CSA also increased downstream as the bradshaw model suggested it would
- The smallest CSA was at the 1st site = 0.095m2The largest CSA was at the last site = 3.727m2
- A spearman's rank test also verified a strong positive corrolation between distance and CSA, with a result of 0.905.
- this is greater than the value of 0.881, at the 1% significance level
- The enquiry we completed could have been improved by more accurately dividing the river into 4 equal parts which we did not do
- this meant we were estimating where to put the velocity impeller and our results weren't as accurate as they could have been
- Improving this would make results more accurate
- another thing would be to find an average wetted perimeter by taking three measurements at every site instead of picking one spot, which may have been inaccurate and not represented the site well
How far did your conclusions match the geographical theory on which your study was based?
state geographical theory which we chose as it was in its natural state (only 8% urbanised) with little management
- CSA increased from 0.139m2 to 3.727m2 (with a spearman's rank of 0.905)
- Velocity increased downstream from 0.139m/s to 2.282m/s
- (with a spearman's rank of 0.976)
OVERALL: our conclusions strongly corrolated with the Bradshaw model
In which ways would your investigation be useful to other people?
- Would be useful for:
- other A-level students as secondary data
- environmental agency, to decide on management schemes
- the fieldwork centre, as a bank of resources for future use
- Land owners along the river, to see if they are at risk of flooding
Drawing upon your findings, explain how your enquiry improved your understanding of your topic area (5)
- Helped to show relationship between distance downstream and velocity and CSA
- Gave a visual links to the Bradshaw model
- Showed the Bradshaw model wasn't always accurate
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