fieldwork - river holford

Question 1

what is the title of our physical fieldwork?

Answer 1

Exploring downstream changes along the River Holford

Question 2

benefits of the location

Answer 2

• river had footpaths = safe and accesible
• accesible car park
• river showed obvious changes

Question 3

name 2 risks and ways to prevent them:

Answer 3

1. slipping/tripping - wear appropiate footwear, dont run
2. drowning - avoid deep fast flowing water

Question 4

whats the geographical theory?

Answer 4

BRADSHAW MODEL
- discharge increases downstream as tribatries join
- velocity increases as there is larger for veloicity of water = more energy & less friction as chanell widens and deepens

Question 5

hypothesis

Answer 5

1. discharge will increase as we move downstream
2. velocity will increase as we move downstream
3. cross section area will increase as we move downstream

Question 6

what sampling method did we use?

Answer 6

stratified & some systamtic
- measuring after tributries and their safety

Question 7

explain the qualitve method used?

Answer 7

• we used a field sketch/photo and annotated it to higlight key features e.g gradient, pebble size

Question 8

explain quantative method

Answer 8

• cross sectional area
• we used a tape measure to measure the width of the wetted edges [stratfied]
• then divided the width by 10 and used a meter ruler to measure the depth at all 10 points [thin end faced up stream]
  =sytematic

Question 9

explain quantative method 2 [systematic]

Answer 9

• velocity
• at each site we measured the width w a tape measure and divided it by 3
• at each point used a** flow meter **and timed how long it took the impellor to reach the bottom
• then worked out the mean velocity from 3 readings

Question 10

secondary data used ?

Answer 10

• geology maps to work out geology of area
• google maps = to identify safe acsess points

Question 11

how did we present our data

Answer 11

• line graph
• ## plot discharge against distance downstream

Question 12

how was GIS used

Answer 12

• to locate our velocity data onto a map = so we could visually see the change in velocity

Question 13

what did our results show

Answer 13

as we travelled downstream the discharge, cross sectional area and velocity increased

Question 14

how reliable were our results

Answer 14

• in fast flowing parts = hard to keep tape measure taut may have impacted reading
• identifying the wetted bank = subjective
• only took data from 1 day = so the wind direction and weather may of impacted results

Question 15

what improvements could be made?

Answer 15

• larger sample size
• gone at different times of year
• use a dif technique for velocity w low flow