3.
Hypotheses
1. Channel size or Cross Sectional area will increase with
distance downstream.
2. Channel efficiency will increase with distance from the
source.
3. Channel gradient will decrease with distance
downstream.
4.
Essential Graphs
1. Channel cross sections of your own groups 4 sites.
2. Graph to show downstream change in Cross Sectional
Area (all 12 sites)
3. Graph to show downstream change in channel
efficiency (all 12 sites)
4. Graph to show downstream changes in channel
gradient (all 12 sites)
5. Pie chart to show downstream Average Powers Score at
12 sites. Powers data could also be shown as pie charts
for your own groups results (4 sites)
5.
Are there photographs that will
support your data presentation?
From your photos find 10 images that you could
use as part of your data presentation
6.
Cross Sectional Areas - Drawings
You will need to draw a channel cross section graph for
each of your own groups 4 sites.
These should be presented on graph paper and should be
to scale.
8.
Deciding on Scale
Width - (x axis) 1 metre = 2 squares on graph paper or
….cm
so a 3 metre river will have a width of six squares on the
graph.
Depth - (y axis) 1 metre = 10 squares or …..cm
so a depth of 70 cm will be 7 squares or ...cm on the
graph.
depth intervals- divide width by 11.
9.
Fig 3.3 River Channel Cross section - Site1 - Upper Course.
Annotated
site photo
.010
m/s
Channel
Efficiency
0.22
m/s
0.01
m/s
12.
Making your cross sections more sophisticated.
• Adding text to describe the shape of the channel.
• Calculating and commenting on channel efficiency.
•
•
of the channel.
Adding velocity data across the channel.
Plotting bedload on the bottom of the channel by
using proportional circles to show powers score for
each 10 pieces of bedload.
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