Geography -- Overall info about the river case study

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  • How and why does river velocity change downstream? Case study of the river Holford -- Overall information
    • The Bradshaw model
      • The Bradshaw model shows that river velocity actually increases as it travels further towards sea level.
      • The Bradshaw model shows how going downstream many things happen
        • Some things increase
          • The discharge
          • The occupied channel width
          • The channel depth
          • The load quantity
          • The average velocity
        • Some things decrease
          • The load particle size
          • The channel bed roughness
          • The gradient
    • Why do rivers run faster downstream?
      • 1) Higher discharge downstream will force water to move along fast
      • 2) Smaller stones downstream mean that there is less friction slowing the water down
      • 3) More obstacles/rocks in the channel upstream slow water
      • 4) more tributaries join= add in water
      • 5) irregular channel shape upstream slows water
      • 6) the efficiency increases downstream = the hydraulic radius
    • The river Holford
      • It is located in North Somerseton the coast
      • It's source is south and it travels north until it meets the sea
      • The length of the river is around 6-7 km
      • The area of the drainage basin is around 10km squared
      • The flow is from the Quantocks to the British channel


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