geography fieldwork

fieldwork for isle of wight

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AS Geography Fieldwork
1. Geographical Context.
The river Caul Bourne flows north from the village of Calbourne to the Newton river, where it
discharges into the sea at Newtown Bay.
In Shalfleet in 1993 the river Caul Bourne flooded, due to heavy rainfall in
a short period of time.
In the drainage basin the geology is mainly made up of chalk which is
porous, this means that over time the water sinks through into the rock
which makes it become saturated and let water flow off. As well as that
sometimes the chalk becomes very soft when it comes into contact with
water and sometimes even dissolves into the water.
2. The aim for the investigation was to find out about the efficiency of the river
at different points along its course and record evidence of geomorphological
processes. The hypothesis was that as you go downstream in the river it
efficiency increases.
3. Data Collection.
The methods of primary investigation that were used was that we
measured the stream width with a tape measure along with the bank full
width which was measured with a metre stick and a tape measure,
eventually we worked out the wetted perimeter. In addition to this we also
worked out the bank full depth and water depth at 0.5m intervals along the
distance. We also measured the stream flow using a flow meter to work
out the velocity, this was done three times and then we worked out an
average, a float (dog biscuit) was also used, this involved dropping a dog
biscuits at a certain point and working out the distance that it travelled in
10 seconds and then working out an average after three measurements. The
percentage cover of vegetation was worked out using a 10 by 10 gauze,
this was when we dropped it in a random place in the area we were
examining and worked out the percentage of squares in the gauze that were
covered in plants. Another method that was used is that we tried to see
what the beadload was like, this involved picking up a rock randomly and

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The channel gradient was also
calculated using clinometers.
We chose these methods because it was the most accurate way of
analysing the different parts that make up the section of the river that we
were working on. It also helped us to see exactly how the river worked and
how each of the different things that we measured changed as you changed
the part of the river you were examining.…read more

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Average 2.57
Pebble Rock Type Shape (powers) Length
1 Sandstone 4 9.5
2 Sandstone 1 6.2
3 Chalk 2 3.5
4 Flint 4 2
5 Flint 2 1.4
6 Sandstone 3 1
7 Chalk 4 3.1
8 Sanstone 4 7.2
9 Sandstone 2 3.4
10 Chalk 1 3.4
CHANNEL GRADIENT=Estimated Angle (clinometer): 2º
SITE NAME: CALBOURNE MILL (above confluence)
Stream width:260 Bank full width:300 Wetted Perimeter:265
Distance 0 0.5 1.0 1.5 2.0 2.5 3.…read more

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Float (distance
travelled in 10
Reading Velocity (m/s)
1 7.80
2 7.70
3 7.30
Average 7.6
Pebble Rock Type Shape (powers) Length
1 Flint 2 7
2 Flint 4 6.3
3 Sandstone 1 5.4
4 Flint 2 3
5 Flint 2 6
6 Flint 2 12
7 Flint 6 5
8 Flint 1 7.1
9 Flint 2 4.1
10 Flint 2 5.…read more

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Distance 0 0.5 1.0 1.5 2.0 2.5 3.0
Bank full
depth (cm)
Water depth
Stream width: Bank full width: Wetted Perimeter:
Flow meter
Reading Velocity (m/s)
1 0.184
2 0.214
3 0.184
Average 0.194
Float (distance
travelled in 10
Reading Velocity (m/s)
1 1.64
2 1.0
3 1.06
Average 1.…read more

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Pebble Rock Type Shape (powers) Length
CHANNEL GRADIENT=Estimated Angle (clinometer):
Distance 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Bank full 0 50 49 58 57 60 56 40.5 0
depth (cm)
Water depth 0 4 4 4.5 6 3 0
Stream width:260 Bank full width:300 Wetted Perimeter:265
Flow meter
Reading Velocity (m/s)
1 36.4
2 51.…read more

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Average 43.4
Float (distance
travelled in 10
Reading Velocity (m/s)
1 0.89
2 32.16
3 24.12
Average 19.056
Pebble Rock Type Shape (powers) Length
1 Flint 4 9.3
2 Flint 2 9.9
3 Flint 4 7.2
4 Flint 4 6.6
5 Flint 2 3.9
6 Flint 4 3.6
7 Flint 1 1.2
8 Flint 2 5.2
9 Flint 5 2.5
10 Flint 2 3.3
CHANNEL GRADIENT=Estimated Angle (clinometer):
6.…read more

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The data collection methods that were used were firstly that we measured
12m along the salt marsh and used 10 pins to see the different kinds of
plant life that the pins would come in contact with in 2m intervals along
the salt marsh. Secondly a soil sample was taken ever 2m across the salt
marsh with a soil auger, this would enable us to find the soil moisture
content along with the salt meter content.…read more

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The issues and conflicts involved in the management of the coast in the
Isle of Wight is that the area is a SSSI (Site of Special Scientific Interest)
which means that you can't do much to it, as it is an important area of
marine habitat and is a European conservation destination.
The coastal protection scheme is a soft engineering scheme. in the year
2002, 3000m³ of shingle was placed, the cost of this was £50,000.…read more


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