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Fieldwork key information
· Method
­ 10 sites selected using systematic sampling
­ Narrow river
· Scree on right bank
· Covered with reeds and boulders
­ Over 2km
· Risks
­ Slipping on rocks
­ Saturated ground (1m at site 5)
· Location
­ Snowdon 1085m
­ Nant Peris
­ Road A4086
­ Passes through Cllanberis
­ Glyders 999m
­ Snowdonia national park
­ Source at Pen y Pass…read more

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Fieldwork results
Gauging Grid ref Channel Water Wetted Water Velocity Discharge Hydraulic
station width width perimeter C.S.A. radius
(6 fig) (m) (m) (m) (water (m2) (m/sec) (m3) (CSA x (CSA/WP)
width +depth (water (flow vane velocity)
at water's width x formula)
edge LB/RB) avg
depth)
1 645551 1.4 0.55 0.61 0.02 0.03 0.01 0.03
2 643558 1.8 1.75 1.9 0.24 0.05 0.02 0.13
3 641558 1.92 1.25 1.38 0.05 0.51 0.03 0.04
4 634561 2.9 1 1.38 0.13 0.16 0.01 0.15
5 638560 4.65 4.0 4.3 0.25 0.46 0.11 0.06
6 634561 4.4 4.4 4.6 1.08 0.17 0.09 0.24
7 633562 5.33 4.85 5.17 0.68 0.59 0.04 0.13
8 630565 7.4 6 6.12 0.68 0.33 0.23 0.12
9 631565 7.5 4.75 5.03 0.76 0.4 0.3 0.15
10 628567 12.2 11.5 11.64 0.83 0.17 0.14 0.07…read more

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Snowdon work- Aims and hypothesis
Examine how different river variables of the Nant Peris
in Snowdonia National Park change downstream and
see how the compare to the expected patterns of the
Bradshaw model
· Variables that increase according to model include
river discharge and river velocity, gradient and
sediment size should decrease
· Bradshaw model shows rate of change also (testing to
see if velocity increased at a slower rate to discharge)
· Model is theoretical, likely to be differences in my
results…read more

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Snowdon work- Data Collection
1. 10 sites, evenly spread apart starting at Pen Y
pass
2. Selected a cross section using 2 ranging
perpendicular ranging poles
3. Assembled flow vane (propeller attached to a
prop with digital recorder)
4. Placed propeller just under surface of water
facing upstream and started stop watch timed
for 1 minute (done at right and left bank and
centre)…read more

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Snowdon work- Data Collection
· Float Method at site 1
­ Velocity too low to take a reading
­ Ranging pole placed 10m downstream, measured
using tape measure
­ A float (dog biscuit) placed in river upstream and
stop watch started and was stopped when float
passed other ranging pole…read more

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