Dalby fieldwork

Question 1

Data collection - impeller

Answer 1

V along W - measured width - % into 10 equal widths (systematic sampling) - put impeller in at each point along width and at 10 cm deep until bed or river - time the blade of impeller to reach spindle (stop watch) - converted readings to velocity

Question 2

Risk assessment

Answer 2

• hypothermia - high severity -> fall in water or windchill - avoid by : warm/spare clothing : be close to vivsitor centre for warmth : warm drink

Question 3

Data presentation - isovels

Answer 3

Crossprofile of river showing isovelsCrossprofile of velocity with Choropleth shading - where the fastest velocity was - plotted width and depth data to create a cross section - plotted velocity readings - drew isovels to show velocity lines - colour coded to every 0.10 velocity - easy, simple & visual

Question 4

Data analysis - HR &V

Answer 4

HR ^ so does V - scatter graph showing correlation between HR and V = negative correlation - then calculated a spearmans rank coefficient to see how strong = strong negative correlation - (-0.73) - Rs into significance graph = 5% chance that correlation occurred by chance - hyp was false due to strong negative correlation

Question 5

Use of ICT - G & V scatter

Answer 5

G ^ so does V - did a scattergraph - put our results into a table in excel which created a scattergraph with a best fit line and labeled axis - to see correlation

Question 6

Use of ICT - scattergraph eval

Answer 6

Easy to compare - no human error - best fit line (more accurate) neat - less time

Question 7

Evaluation - Strengths

Answer 7

Wide range of results (width & depth to channel roughness) - data collection = impeller was accurate & reliable and valid - large group ( quicker data collection)

Question 8

Evaluation - weaknesses

Answer 8

Leaves and grit & human error reduced accuracy - only in autumn - only in Dalby -

Question 9

Evaluation - improvements

Answer 9

One person to collect data - digital flow metre = higher accuracy and less human error - could revisit in other seasons - go to another river and compare

Question 10

Improved understanding of topic

Answer 10

Hyp 1 = confirmed same as in textbook - Hyp 2: was not Bradshaw model ( didn’t have constant discharge) - Hyp 3: uphill coming out of a pool

Question 11

Location

Answer 11

Dalby beck - close to visitor centre - natural - has meanders