Geography unit 2

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  • Created by: Bethany
  • Created on: 13-05-14 20:57
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  • Geography unit 2
    • Data presentation
      • Line graph to produce cross section
        • X axis depth, Y axis width
          • For example- width at 1650m from source was 2.1m and scale was  0.15m
          • Raw data for every 30cm increment across width of channel for one sample plotted
        • Cross section gives visual imagery of changes in depth & width
        • Easy to interpret
        • Have to do this for each sample (10) so is time consuming
    • Aim
      • Bradshaw model
        • Similar changes occur down stream in all rivers
        • Velocity, depth & width  increase
      • Study area
        • 1650m-3450m from source of Burbage Brook- tributary of R. Derwin
          • Derby
          • 3 confier woods
          • West of seasonal marshland
        • Near car park, acessible & no human alterations
    • Data collection
      • Primary
        • Depth
          • Systematic sampling every 25m
            • Reliable due to sample technique
              • Cheap & easy
              • Used with width to calculate cross sectional area (more comparisons to model)
                • Pressure on M rule- anomalous results
                  • Risk of drowning
          • 2. Stretch tape measure from bank to bank
          • 3. With the 0m end of the meter rule facing downwards, measure the depth of the channel at 30cm intervals  using the tape measure as sampling points
      • Secondary
        • OS map
          • See accessibility of river & find areas we would visit
        • Information booklet
          • Geology
    • Results
      • Depth at 1650m- 0.17m and width 2.1m
        • Velocity 0.05 (1650m) TO 0.33 (2750m) TO 0.35 (3450m)
      • Depth at 2750m- 0.2m and width 2.5m
        • CONCLUSION
          • Our hypothesis 'Depth & width will increase downstream' is correct. It increased from... to.... However, the raw data shows depth fluctuated from 1650m from source to 3450m from source. Despite all this, SPR is 0.7 and the significance level is under 5% meaning a relationship is there
            • This is due to velocity increasing from 0.05 to 0.35resulting in increased erosion
              • Fits the Bradshaw model
          • EVALUATION
            • Lots of samples- represenative
            • Systematic sampling- reliable
            • Risks
              • Ilness from water
                • Wore gloves, go in non polluted water
              • Drowning
                • Don't go in turbulent water, watch each other and check deepness with stick beforehand
            • Only one river- not generalisable
      • Depth at 3450m- 0.26m and width 3.4m
    • Data analysis
      • Spearman's Rank
        • 1. Rank distance & depth
        • 2. Find difference between ranks
        • 3. Square difference, multiply by 6 and divide by (samples cubed - sample soze)
        • Depth: 0.7
      • Standard deviation
        • 1. Find mean
        • 2. (value-mean)2
        • 3. sum of (value-mean)2
        • 4. divide by n-1 (varience)
        • 5. Square root varience
        • Depth- 0.11m

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