Results form the River Holford study

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  • River Holford results
    • The question was: How and why does river velocity change downstream?
    • The velocity has increased going downstream
      • At the beginning of the Holford the velocity was 0.06 m/s and further downstream it was 0.38.
        • This may be linked to hydraulic radius = the more efficient the channel is then the faster it will go
          • The Hydraulic radius consistently increased apart from site 4 where it decreased (along with the velocity)
        • The velocity is also linked to discharge which consistently increased further downstream
          • The cross-sectional area and discharge also both consistently increased this shows that there was more water downstream which we know increases velocity
            • The cross-sectional area changed from 0.04m to 0.46m and the discharge increased by 0.17, an increased of 1600%
      • Overall all the results support the increase in velocity apart from site 4. This site was an anomaly. The reason it was an anomaly was because it was very wide and so had a lot of friction yet not a large increase in discharge,
    • The gradient has also decreased going downstream
      • Having a high gradient means that water runs faster
        • However, the combination fo the other factors overcame the changes in the gradient
          • This is what leads to the water flowing faster at the bottom

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