RIVER FIELDWORK Flashcards
What was our hypothesis?
Width and depth will increase the further downstream. This is because there is more water entering the river resulting in more lateral and vertical erosion.
Why did we chose our location?
Close to school to maximise data collection time
River shows significant changes over a small distance
Easy accessible river (safe)
What are the risks?
Strangers
Trips and slips
Insect bites
Hypothermia
What are the solutions to the risks?
Keep in groups
Be sensible in river and wear appropriate footwear
Check yourself for bites and be covered
Wear sensible warm clothing
What is our title?
To investigate the changing cross profile of River Tillingbourne
What was our conclusion?
The river got wider because ore water in channel means more lateral erosion
Human interference also contributed to wider river channel
River did not significantly change in depth as artificial straightening resulted in more lateral erosion
How did we measure the width?
4 sites along river
Used tape measure on one edge of the river bank to the other
What were the limitations of measuring the width?
Vegetation in way preventing accurate results
Tape measure not stretched enough
How did we measure the depth?
Divide width of river by 10
Starting from river bank measure depth using 1m ruler in each 10 spots
Read off river depth at eye level
What were the limitations of measuring the depth?
Human error
Might not be level
How did we measure the bedload?
At each interval along the river width collect 5 rocks
Using rock angularity chart determine the level of angularity
What were the limitations of measuring the bedload?
Subjective in picking rocks
Difficulty in correvctly identifying rock shape
What did the CSA show?
Width and depth increases further downstream
What are the advantages of CSA?
Easy to spot anomalies
Visual so can compare between different sites
(Difficult to have scale)
What did the scatter graph show?
CSA increases with distance from the source
More water in river further downstream means more lateral and vertical erosion
Anomalies at sites 6, 7 and 8 due to human interference
