Controlled assessment - Data Presentation
- 2. What do the examiners say?
- 3. Hypotheses 1. Channel size or Cross Sectional area will increase with distance downstream. 2. Channel efficiency will increase with distance from the source. 3. Channel gradient will decrease with distance downstream.
- 4. Essential Graphs 1. Channel cross sections of your own groups 4 sites. 2. Graph to show downstream change in Cross Sectional Area (all 12 sites) 3. Graph to show downstream change in channel efficiency (all 12 sites) 4. Graph to show downstream changes in channel gradient (all 12 sites) 5. Pie chart to show downstream Average Powers Score at 12 sites. Powers data could also be shown as pie charts for your own groups results (4 sites)
- 5. Are there photographs that will support your data presentation? From your photos find 10 images that you could use as part of your data presentation
- 6. Cross Sectional Areas - Drawings You will need to draw a channel cross section graph for each of your own groups 4 sites. These should be presented on graph paper and should be to scale.
- 7. Cross Sections drawn to Scale
- 8. Deciding on Scale Width - (x axis) 1 metre = 2 squares on graph paper or ….cm so a 3 metre river will have a width of six squares on the graph. Depth - (y axis) 1 metre = 10 squares or …..cm so a depth of 70 cm will be 7 squares or ...cm on the graph. depth intervals- divide width by 11.
- 9. Fig 3.3 River Channel Cross section - Site1 - Upper Course. Annotated site photo .010 m/s Channel Efficiency 0.22 m/s 0.01 m/s
- 10. Student Examples of Sophisticated Channel Cross Section – Upper Cousre
- 11. Student Examples of Sophisticated Channel Cross Section – Middle Cousre
- 12. Making your cross sections more sophisticated. • Adding text to describe the shape of the channel. • Calculating and commenting on channel efficiency. • • of the channel. Adding velocity data across the channel. Plotting bedload on the bottom of the channel by using proportional circles to show powers score for each 10 pieces of bedload.
- 13. Cross Sectional Area - Trend 14.00 12.00 10.00 8.00 6.00 4.00 2.00 0.00 1 2 3 4 5 6 7 8 9 10 11 12
- 14. Cross Sectional Area - Trend Cross Sectional Area of River Channel Downstream 14.00 LEGEND 12.00 Cross Sectional Area (m²) Upper Course 10.00 Middle Course 8.00 Lower Course 6.00 4.00 2.00 Fig: 3.1 0.00 1 2 3 4 5 6 7 Sites 8 9 10 11 12
- 15. Now it’s your turn! Draw a bar chart to show downstream change in channel efficiency over the 12 sites.
- 18. Bedload
- 19. Comparing Data Average Channel Velocity against Channel Gradient downstream 25 0.30 0.25 20 15 0.15 10 0.10 5 0.05 0 0.00 1 2 3 4 5 6 7 8 9 10 11 12 Sites Channel Gradient Average Velocity Linear (Channel Gradient) Linear (Average Velocity ) Velocity m/s Gradient (°) 0.20
- 20. Other graphs may be applicable A scattergraph could be used if you do a spearman rank coefficient of correlation to show downstream site and CSA.