How Well Does The River Tillingbourne Match The Bradshaw Model

3446 words - 14 pages

How well does the River Tillingbourne match the Bradshaw Model?

As you travel further downstream a river, the rivers discharge increases. The water discharge increases as it flows downstream it meets more streams and also collects rain from the increased catchment area.
As you travel further downstream a river, the rivers discharge increases. The water discharge increases as it flows downstream it meets more streams and also collects rain from the increased catchment area.
Channel depth increases downstream. As there is an increased discharge, you have much more energy for erosion, also a larger body of water.
Channel depth increases downstream. As there is an increased discharge, you ...view middle of the document...

We were also given permission to access private land through the FSC. Also, we will be able to have access to secondary data which we can apply to the study.
Background information: The River Tillingbourne runs along the south side of the North Downs and joins the River Wey at Guildford. Its source is near Tilling Springs to the north of Leith Hill (294m Above Sea Level) It confluences at Shalford with the River Wey, which flows into the Thames, which in turn flows into the North sea. The Tillingbourne runs through Friday Street, Abinger Hammer, Gomshall, Shere, and Shalford. The river is 18km in length.
Carrying out the study: we will cover only select parts of the Bradshaw Model and a limited part of the river (5 selected sites) due to the lack of time available within the given timespace and the lack of available resources.
Hypothesis:
The discharge of the River Tillingbourne increases with the distance from the source.

Choosing Site locations and Sampling techniques:
A sample is a representative part of a whole. Various sampling techniques were available to us, but we needed to choose the best sampling method. Out of these were:
* Random Sampling: This method of sampling is preferable as it is free of bias, however it was unsuitable as it does not give evenly spread results.
* Systematic Sampling: This method is preferable as it gives results in equal intervals, however; in doing so, there are various parts of the River we would have to go to. This posed an issue as many parts were private land or were designated public places (such as parts of a town)
* Partly private land (ran through back gardens of people’s homes)
Partly private land (ran through back gardens of people’s homes)
Stratified Sampling: This method was used as it avoids the issues of the previous two, as the sites can be specifically chosen. (Variables such as safety can be applied) as well as the results are in close intervals.
Private Land
Private Land

Source: FSC

Chalk substrates found at Gomshall 1
Chalk substrates found at Gomshall 1

Predominant geology is made of greensand
Predominant geology is made of greensand

Forested areas, which have high levels of interception
Forested areas, which have high levels of interception
River Source: Also various settlements are located here
River Source: Also various settlements are located here
Settlements, mean that there is more run-off into the river, which affect lag times.
Settlements, mean that there is more run-off into the river, which affect lag times.
Designated Public space (cricket field)
Designated Public space (cricket field)

Dorking and Guildford are the nearest towns. (nearest settlement, a lot of impermeable rock, which increases lag time)
Dorking and Guildford are the nearest towns. (nearest settlement, a lot of impermeable rock, which increases lag time)
The River Tillingbourne is located in south east England
The River Tillingbourne is located in south east...

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