Geography -- revison checklist River Holford

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  • Revision Checklist -- Rover Holford
    • 1) Can you clearly state your title or hypothesis?
      • How and why does river velocity change downstream?
    • 2) Can you draw your sketch map with sites and labels on it, by hand accurately?
    • 3) Can you list 2 reasons why you went to the study area in PRACTICAL terms
      • 1= It was small enough to travel around easily (by foot) and to measure a significant proportion of the river
      • 2= It was small enough for us to measure by hand
    • 4) Can you list 2 reasons why you went to the study area  to examine the THEORY
      • 1= It had many tributaries and changes which affected the river
      • 2= It had varying velocities and moved from high land to low land relatively quickly
    • 5) Can you describe the location of the study area at a local and national scale using compass directions, distances and local landmarks?
      • The River Holford is located in Northern Somerset, Southern England and is close to Minehead.
    • 6) Can you describe the theory behind your topic in detail?
      • This is about the Bradshaw model and the 6 reasons why rivers run faster down stream
    • 7) (practically the same as 6)
    • 8) what risks were there in collecting your data?
      • There were many risks such as sunburn, falling in the river, getting lost etc.
    • 9) How did you reduce those risks prior to going, during the visit and after the collection
      • Wore sunscreen, hats and wellingtons as well as being careful around the river. When moving around we made sure to always be close to the teacher and in pairs at the least
    • 10) Can you give a clear step by step description of how you collected 2 types of data?
      • 1= The velocity (propeller etc)
      • 2= Hydraulic radius
    • 11) What sampling methods were used to collect the data?
      • We did systematic sampling for the overall river, choosing points when in changed velocity
    • 12) Can you give full and detailed reasons why you collected the data in this way?
      • I collected the data in this way because it minimised the time. It also meant I shows all of the major changes and thus a more complete image of the river. If I chose randomly it would not be a complete view.
    • 13)  Can you identify all of the problems you had collecting information for 2 of your methods?
      • 1= velocity (human error, propellor getting  stuck etc)
      • 2= Hydraulic radius (human error, water heigh varied etc)
    • 14)  Can you sketch 2 graphs you presented your data with , with data on?
    • 15) Can you say why you presented the data in a certain way?
      • I presented the proportional circle map because it shows the location, rough size etc...
      • Also I did the cross sectional area because it was clear and showed me how it might influence the velocity
    • 16)  Detailed sequence about how the graph was constructed?
      • I used ArcGIS online to make the proportional circle map
      • I used depth reading and cross - section readings to draw hit out. 4 cm on the page equaled 1m in real life
    • 17) Can you say how you would add or adapt the presentation methods?
      • For the cross sectional area I might multiply the depth by 2 because ti would make the differences clear
      • For the proportional circle map I would also add the speed onto the circles to make it clearer what the results were
    • 18)  Can you quote 2 results that link to your aim?
      • 1= velocity increased over 5000% downstream for 3km along the river Holford
      • 2= Overall the hydraulic radius increased for the 6 sites, apart from site 4 where it decreased
    • 19) Can you explain the results in relation to you r theorem
      • The hydraulic radius increased because there was more water from tributaries, the river winded less and there were less obstacles
      • The velocity increased because of the hydraulic radius increasing
    • 20)  How did you use statistics to help you analyse your data?
      • We had six groups getting 6 results fro the velocity and we got the mean
      • we used them to find the percentage change
    • 21) Are you able to answer your title question using evidence?
      • Yes, evaluation (Mindmap )
    • 22) Do you link some of your results together?
      • Yes, hydraulic radius and velocity
    • 23) Can you be sure of the reliability and validity of you results?
      • Yes for all apart form gradient. Roughly. Mindmap
    • 24) can you list 2 ways your data collection methods could be improved
      • Repeat study after heavy rainfall, more measurements
    • 25) Do these improvements link to the problems listed earlier?
      • no
    • 26 How would you improve the reliability and validity
      • Do more measurement sand at more places

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