Physical Fieldwork Flashcards
What were the two hypothesis
The river is deeper on the outside bend
The river load is smaller on the outside bend
Why does the river flow faster in the outside bend
Because it is deeper, so there is less friction to slow the water down
What two bits of data did we collect
River depth
Sediment size
What method did we use to collect data of the river depth
Measure width of river and divide by 10 to get a measurement of one unit. Every unit across take a measurement with a metre stick and record
What were the problems with measuring the river depth
When measuring the initial width to work out the measurements, the tape measure would hit the water and be moved, making it seem longer than it actually was
The metre ruler may have been pushed into the river bed making it seem deeper
Which location did we use and why
Borrow dale ghyll( a tributary of Derwent river)
It was safe an accessible
Had a meander so fit with our results
What were the risks and how did we overcome them
Dangerous material travelling down river: always faced in direction where water was travelling towards us
Protective clothing: people in water wore waders
Supervision: teacher was always present
What method did we use to get data about the bed load
At every unit across the river someone randomly picked up a piece of bedload and it was measured using a calliper
What were the problems with our method to get bed load data
The person may have subconsciously picked up the largest piece, skewing the results
How did we use systematic sampling
In both methods, measurements were taken at regular intervals
When did we use random sampling and how can this be improved
When picking up the bedload we randomly picked one up from that area
Could be improved by measuring more than one and finding an average
Trend evidence anomaly for the river depth data
It is deeper on the outside bend
Inside bend was 15cm deep
Outside was 73 cm deep
Anomaly was that the deepest part was 7 units along the channel, then it got slightly shallower but was still deep
Trend evidence anomaly for the sediment data
Sediment was bigger on the inside bend
Three largest pieces were over 10cm long, they were all on inside bend
No anomalies
How is the sediment size data explained
There is less energy on the inside bend so large load can’t be transported so it is deposited and left
Also with less energy is less erosion so the sediment stays large
How is the river depth data explained
There is a fastest flow at the outside bend as more erosive power and less friction slowing it down
