Physical - River Holford

• To what extent is the River Holford a typical river?
• Our data collection zone was suitable because:

  • It was close enough that we could visit in a day
  • There were a range of sites that we could survey throughout the day
• The theory that underpinned our investigation - Bradshaw model:

  • Velocity - increase
  • Channel depth/width - increase
  • Load particle size - decrease
• Risks:

  • Trips - wore sensible footwear
  • Getting lost - stayed in a group
• River velocity:

  • 3x 10m distances
  • Floating a cork and timing how long it takes and calculated a mean
  • Finding how the speed of the river changes - we expect it to increase downstream
  • However, the cork could get stuck on a rock and affect the results
  • We could fix this by moving some rocks before launching the cork