Physical Feildwork

Question 1

Title

Answer 1

To investigate the changes to the characteristics of the River Tillingbourne along its long profile

Question 2

Hypothesis 1

Answer 2

There is no change to the CHANNEL CROSS PROFILE

Question 3

Hypothesis 2

Answer 3

There is no change in the SEDIMENT SIZE & SHAPE

Question 4

Location

Answer 4

River Tillingbourne
Surrey near the town of Guildford, South East England.
It is a tributary off the River Wey

Question 5

Justification (5)

Answer 5

Accessibility
Familiarity
Relevance
Close proximity
Safety

Question 6

Risk assessments (3)

Answer 6

Livestock
- farmers are aware
- students stay away
- bring allergy meds

Sipping/falling
- appropriate footwear
- first aid

Sunstroke/dehydration
- shade
- suncream
- water

Question 7

Theories & concepts

Answer 7

Bradshaw’s model
- shows how characteristics change over long profile from upper-lower
Power Scale of Roundness
- determines rock roundness/smoothness category

Question 8

Human influences (6)

Answer 8

River straightening
Embankments
Pollution/dirty water
Displaced sediment
Afforestation
Waste

Question 9

3 sites?

Answer 9

Broadmoor (⬆️)
Crossways farm (➡️)
Sheer (⏬)

Question 10

Examples of systematic sampling? (2)

Answer 10

Dividing width by 9 for 10 equal intervals
-use metre stick to measure depth
-collecting sediment @ each interval

Question 11

Example of random sampling?

Answer 11

Randomly selecting sediment with hand

Question 12

Justification of method (5)

Answer 12

Cost
Time constraints
Available equipment
Level of study
Sampling
- manageable size
- easy even if not accurate

Question 13

Example of stratified sampling?

Answer 13

Selecting locations based on theory
- upper/middle/lower

Question 14

3 types of sampling

Answer 14

Random
Systematic
- regualar intervals
Stratified
- based off a theory or hypothesis

Question 15

How dod we present our river cross profile data?

Answer 15

Line graph shaded in (y-axis = depth)
- easy to visualise/shows riverbed/ simple
- easy for errors/inaccurate/jagged plotting/time consuming

Question 16

How did we present out sediment shape data?

Answer 16

Used categories, found %s and used a pie chart for each site
- easy to visualise/good for comparison
- random/subjective

Question 17

Data analysis (3)

Answer 17

• sediment size ⬇️ towards lower course
  (Broadmoor = 7.8cm, Sheer = 5cm)
• sediment shape ⬆️ roundness towards lower course
  (Angular rocks:
  B - 30%, C - 20%, S - none!)
• width ⬆️ downstream
  ( sheer is 600% ⬆️ of Broadmoor)

Question 18

Stats to remember!

Answer 18

Sediment size
Broadmoor = 7.5cm
Sheer = 5cm

Sediment shape
Angular rocks:
Broadmoor = 30%
Crossways = 20%
Sheer = 0%

Question 19

Conclusion: HYP 1

Answer 19

DISPROVE ❌
- graphs show different cross profiles
- lower course = smoother and more symmetrical
- width & depth ⬆️ downstream

Question 20

Conclusion: HYP 2

Answer 20

DISPROVE ❌
- pie charts are different %
- size ⬇️ downstream
- angular rocks ⬇️ downstream

Question 21

EVALUATION:
Strengths (5)

Answer 21

Disproved with evidence
Clear and simple
Acceptable results (alined with concepts & theories)
Easy to present data
Site selection

Question 22

EVALUATION:
Weaknesses (4)

Answer 22

• inaccurate measuring (miscalculated intervals/wanky meter-stick)
• subjective measuring (PSoR)
• biased (more likely to pick up ⬆️ sediment)
• sites close together

Question 23

EVALUATION
Improvements (3)

Answer 23

• Calleux Roundness Index (more accurate formula & removes subjectivity)
• use Callipers (instead of ruler)
• larger sample