5103208
To investigate downstream changes in channel characteristics on
the River Tillingbourne
- Bradshaw Model
- Is used to explain how the river course and
characteristics change as it moves from source
to mouth. As a river progresses downstream
its channel characteristics and morphology
change, with velocity and hydraulic radius
increasing but gradient decreasing
- Is used to explain how the river course and
characteristics change as it moves from source
to mouth. As a river progresses downstream
its channel characteristics and morphology
change, with velocity and hydraulic radius
increasing but gradient decreasing
- River Tillingbourne
- 19 km long
- ABINGER HAMMER -
6km from source
- CROSSWAYS FARM -
4.3km from source
- SHERE CHURCH
- Source is Wotton Common
- 286m above sea level
- ABINGER HAMMER -
6km from source
- Located in Surrey
- Low level river
- it was suitable
- Easily accessible sites meant we were
safely able to collect data
- The scale of the river is effective as our sample sites
weren't too far away from each other, meant sampling
different areas was possible
- The depth of the river wasn't too high so we
were able to enter the river ourselves and
collect data
- Easily accessible sites meant we were
safely able to collect data
- it was suitable
- Low level river
- Drainage Basin Size 57km2
- 19 km long
- Hazards and Risks
- Step one
- The recognition of potential hazards and
these were compiled into a list
- Step two
- The chance of the occurrence of these risks was analyzed and
each risk was given a level of 1-10 according to how likely this
hazard was to occur.
- The chance of the occurrence of these risks was analyzed and
each risk was given a level of 1-10 according to how likely this
hazard was to occur.
- The recognition of potential hazards and
these were compiled into a list
- Step three
- The impact and severity of the risk was taken into
account and given a level of 1-10 depending on how
severe the risk would potentially be if it occurred. These
two levels were then multiplied and the list was
prioritised accordingly.
- The impact and severity of the risk was taken into
account and given a level of 1-10 depending on how
severe the risk would potentially be if it occurred. These
two levels were then multiplied and the list was
prioritised accordingly.
- Water-borne
Diseases : Weils
disease
- HIGH
RISK
- Not eating and drinking near theriver, washing hands
after contact with river and wearing gloves in order to
minimise contact with water.
- Not eating and drinking near theriver, washing hands
after contact with river and wearing gloves in order to
minimise contact with water.
- HIGH
RISK
- Drowning
- Avoiding deep water and anything
that could cause slippage - moss
covered rock
- Avoiding deep water and anything
that could cause slippage - moss
covered rock
- Step one
- Methods used
- Width - Measuring Tape
- Depth - Meter Ruler
- Velocity - Hydroprop
- Improvements
- Go at different time of year when
precipitation levels are lower than in
November
- Sample more places and a greater
number of time to get more
representative data
- Unable to do originally due to
time restraints and private
land
- Unable to do originally due to
time restraints and private
land
- Collect primary data instead of relying on some
secondary data - ensures method is done correctly
and the same everywhere as well as up-to-date
research
- Choose a river unaltered by man
- Go at different time of year when
precipitation levels are lower than in
November
- Improvements
- Width - Measuring Tape
- Data
- Analysis
- Spearman's Rank
- Results:
Velocity :
0.684
Discharge
: 0.879
Width :
0.877
Depth :
0.216
Wetted
Perimeter
: 0.916
Gradient :
-0.851
- Depth didn't meet Model because the river was
artifically widened and straightened to reduce
flooding at Abinger Hammer
- Depth didn't meet Model because the river was
artifically widened and straightened to reduce
flooding at Abinger Hammer
- Results:
Velocity :
0.684
Discharge
: 0.879
Width :
0.877
Depth :
0.216
Wetted
Perimeter
: 0.916
Gradient :
-0.851
- Spearman's Rank
- Presentation
- Analysis
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