AS/A2 Rivers Fieldwork Study

A super detialed Rivers Feildwork study.  It was created by my teacher and re-phrased and re-worked by me.  I got 20/25 in the 1st half of skills ( the part based on the fieldwork) and 32/40 when I the 1st half of unit 4a (in the bit based on the fieldwork)

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AS Geography
Hydrology Fieldwork
The River Lyn, North Devon

Aim ­
To investigate how river channel characteristics change from source to mouth.

Hypotheses ­
1. Velocity increases with increasing stream order.
2. Hydraulic radius increases with increasing stream order.
3. Bedload size decreases with increasing stream order.

Induction ­
The…

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2. Depth ­ The distance across baseline was divided into 10. Measurements were taken
using a metal ruler, channel depth readings were taken. Also we recorded the beginning
and ends of a river.
3. Gradient ­ The angle of slope of the long profile of the river was measured using…

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Width x average depth = cross sectional area (m2)

Cross sectional area x velocity = discharge (m3/sec)

Discharge is a measure of the volume of the water that flows past a given point in the river channel.
Discharge increases with distance downstream because the channel is getting deeper and wider,…

Page 4

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N=11 0.623 0.736 0.780

Therefore, we can be 98% confident that there is a correlation between velocity and distance
downstream. We therefore can reject the null hypotheses and conclude it does increase with
distance.

Statically, hydraulic radius does increase down the river Lyn. There is a significant positive
correlation. It…

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