A Survey of the River Alyn in Wales
On Monday 5th of July we went and conducted a survey of the river Alyn
in Wales, in Loggerheads. We looked at 4 river sections and did
several tests to find the velocity, width and depth of the river we
also recorded the sizes of 30 pebbles from each section. We did this
to test a number of hypotheses.
It took us approximately an hour and a half to arrive there and the
weather was bright and warm with little cloud cover, this was quite
unexpected because on previous weeks it had been raining.
The sites we visited were: (187,575)(188,198)(174,617)(196,629)(please
see map on next page)
Hypotheses
· Is velocity related to depth?
· Do the particles in the bedload of a river become more rounded
downstream?
· Is the pebble size related to discharge?
For the first hypothesis I expect to find that the deeper the river
the more velocity, I think this because there is going to be more
water so therefore more pressure in the river.
For my second hypothesis I expect to find that the particles are more
rounded down stream because the friction in the river should wear them
down more and round them off.
And lastly for my third hypothesis I think that the size of the pebble
is not related to discharge because discharge is the amount of water
which flows through the river at any given time and it’s not what
wears down pebble size (this is friction)
Methodology
To measure velocity we had to get an orange and let it flow down a
certain length of the river, we timed how long the orange took to get
to this area.
Equipment:
· Waders
· 2 ranging poles
· An orange
· A stop clock
· Tape measure
To measure the depth of the river we had to get two ranging poles and
position them at each side of the bank then measured the width of the
In addition, the data points were quite far apart. Having more intermediate data points would have enabled the scientists to more accurately model the continuous nature of the data with a discontinuous series of points. Finally, stopping the flask more quickly would have allowed less gas to escape. Using a mechanical solution that could stop nearly instantly would have been ideal.
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When the liquid level is above the calibration line on the pipette, remove the bulb quickly and put your thumb or index finger over the pipette. Carefully “roll” finger to the side and allow the liquid to drop until the meniscus is level with the mark. Then hold the pipette over the flask to receive the liquid and remove the finger. Allow the liquid to drain out.
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S Soil saturation - this may cause a river to flood as the water would
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