River Wyre Field Work
- Created by: Madi_Lily
- Created on: 06-12-17 16:28
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- Understanding the Bradshaw Model
- The speed and velocity decrease as you move downstream
- This goes against Bradshaw's Model
- The velocity increases as you move down the stream as more water is added via tributaries
- This goes against Bradshaw's Model
- Velocity Evaluation
- problems
- channel very narrow so it is difficult to take the 3 readings (left, middle, right)
- low water levels resulted in sticking
- 5 times at each location was problematic due to time constraints
- Bar chart is a relevant way to show the data
- problems
- Depth and Width
- depth and width will increase as you move down stream
- This is inline with Bradshaw's model
- Increased discharge increases erosion so the channel becomes wider and deeper further down the rivers course
- This is inline with Bradshaw's model
- Problems
- accurate recordings are needed to produce the true likeness of channel in cross section
- For a full cross section you need to measure the distance from the bankfull height to the surface of the water level
- Cross sections are an appropriate way to display the change in channel shape
- need to be clearly labelled with appropriate scales
- As a result this should clearly show the hypothesis
- depth and width will increase as you move down stream
- Stone Size and shape
- The stones will decrease in size and become more rounded as we move downstream
- This supports Bradshaw's model
- due to increased attrition as the channels velocity increases the sediment should become smaller, smoother and rounder
- This supports Bradshaw's model
- Problems
- Measuring radius, depth and width can be difficult with a ruler
- Determining shape from chart can be challenging
- Drawing 2D results can be vague
- could be backed up by photos
- A whole class sample combined to produce a colour coded scatter graph could be more effective to present data
- The stones will decrease in size and become more rounded as we move downstream
- Overall Issues
- The length of the river wyre transect was too short
- Needed a longer transect in the middle or lower course of the river to prove it follows the Bradshaw model
- Major time constraints
- more time was needed at each site to gather sufficient data and disprove/ prove our hypothesis
- Accurate and annotated field sketches back with photographic evidence to help identify the change in channel characteristics as we moved downstream
- The length of the river wyre transect was too short
- The speed and velocity decrease as you move downstream
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