Geography Unit 2 skill and fieldwork

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What was the aim of your fieldwork?
To investigate the changes in river characteristics with distance downstream at Loughton Brook, Epping forest and test against the Bradshaw Model
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What were our 2 hypotheses?
1- Discharge will increase with distance downstream 2-Bedload size will decrease with distance downstream
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What was the theory supporting our fieldwork?
The Bradshaw model is a model which describes how a rivers characteristics change with distance downstream from the source. It shows that discharge, occupied channel width, channel depth and average load quantity increases downstream.
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Describe one method of primary data collection you used?
We collected data that allows us to calculate discharge (CSAxVelocity) in cumecs and also a selection of bedload to calculate average bedload size.
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Where did you do your primary data collection?
Each of the 16 sites with one at the source and subsequent sites located downstream as shown by a sketch map in order to calculate discharge .
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Describe the risk assessment you undertook during your investigation.
Hazard-Likelihood (1-4)- Severity of hazard(1-4)-Total risk before control measures(LxSoH)-Control measures-Risk after control measures
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Outline some hazards you may have experienced.
Weils disease/ Fallen trees or branches/ Extreme weather
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What qualitative data did you collect during your study?
We looked at online mapping tools and geology maps to further our understanding of the study area.
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What quantitative data did you collect?
The velocity, the cross sectional area and the bedload size
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What is primary data and what primary data did we collect?
This is the data we collected ourselves. The velocity, CSA and bedload size.
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What is secondary data and what secondary data did we use?
Data from other sources. We used geology maps and data to understand.
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State some strengths of the method of data presentation you used.
Clear relationship. Line of best fit to represent the relationship. discounts anomalies. shows trend in data set. shows minimum and maximum.
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State some disadvantages of the method of data presentation you used.
Hard to visualize results in large data sets. Flat trend line gives inconclusive results. Data on both axes can be continuous and not for sites.
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What was the range found for discharge?
0.1835 cumecs
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What was the range found for Bedload?
5.55mm
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What was the mean for discharge?
0.03 cumecs
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What was the mean for bedload?
4.26mm
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What was the median for discharge?
0.0068 cumecs
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What was the median for bedload?
3.77mm
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How did you use ICT in your fieldwork?
Used it to create scatter graphs and looked at other methods of data presentation. We used google maps to plot locations of sites and plot located bar graphs
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What did the Spearmans rank test show us about our results for discharge?
0.92 represents a very strong positive correlation and we can accept our hypothesis at the 99% significance level.
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What did the Spearmans rank test show us about our results for bedload?
-0.88 represents a very strong negative correlation and we can accept it at the 99% significance level.
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How did we carry out statistical analysis?
We used the Spearmans rank test
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What are the strengths of the Spearmans rank test?
Shows clear relationship between 2 sets of data. Its clear. Shows accuracy of data.
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What are the disadvantages of the Spearmans rank test?
3rd factors arent considered. Data reliability is related to the sample size. The fact that 2 variables correlate cannot prove anything.
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What were the conclusions of our hypotheses?
Discharge will increase with DDS is ACCEPTED because data displays very strong positive relationship. Bedload will decrease with distance DDS ACCEPTED because there is a very strong negative correlation. Loughton brook does reflect the Bradshaw model
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How could you further your investigation?
Investigate other river characteristics (BL roundness- powers index) Measure a longer stretch of the river
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What was the standard deviation for discharge downstream?
0.923
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What was the standard deviation for BL roundness?
-0.876
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What was the discharge at site 1 and site 16 and what was the anomaly?
1=0.0004 cumecs 16=0.0352cumecs 13=0.182
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What was our study area?
Epping forest, Essex Loughton Brook drainage basin- River Roding
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What were the first 3 layers of rock called?
1-Pebble gravel 2-Bagshot beds 3-Claygate beds
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What were the characteristics of the first layer of rock?
Pebble gravel=Permeable, Sandy rock and yellow
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What were the characteristics of the second layer of rock?
Bagshot beds=Sandy, Permeable, and its transports water slower than layer 1
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What were the characteristics of the third layer of rock?
Claygate beds= Smooth, very fine grit, Impermeable, non-porous and allows water through throughflow
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What about the geology of the area makes it more prone to flooding?
There is a large area of impermeable rock such as London clay and Claygate beds this results in more SRO etc.
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Card 2

Front

What were our 2 hypotheses?

Back

1- Discharge will increase with distance downstream 2-Bedload size will decrease with distance downstream

Card 3

Front

What was the theory supporting our fieldwork?

Back

Preview of the front of card 3

Card 4

Front

Describe one method of primary data collection you used?

Back

Preview of the front of card 4

Card 5

Front

Where did you do your primary data collection?

Back

Preview of the front of card 5
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