GCSE 3.A - Coastal Fieldwork Flashcards
What is the title of the coastal investagation?
To Investagate the impact of Longshore drift on the shingle ridge at porlock bay
What were the 2 hypothesies?
The shingle ride will be steeper in the west of Porlock Bay
The sediment will be smaller and more rounded in the East of Porlock bay
Why will the shingle ride will be steeper in the west of Porlock Bay
The LSD will take the sediment away from the west and erode it
Why will the sediment be smaller and more rounded in the East of Porlock bay
This is where LSD is deposited after being eroded
What is the chosen sampling strategy for location on the beach?
- Allows accurate comparison between the West and East of Porlock Bay
- Systematic would show gradual breakdown of sediment but takes too long
What were the 4 risk included in the risk assesment and what control mesures did we take?
Bug bites and stings
Wear appriate clothing
Rockfall / falling debris
Stay away from cliffside
Poor Weather
Check forecasts, wear appropriate clothing, bring spare gear
Slipping or falling near water
Wear sturdy footwear, stay away from steep/slippery ban
Coastal Investagation
What were the 3 types of data we collected?
Sediment Size
Sediment Shape
Beach profile
How did you mesure the beach profile?
Clinometer to mesure gradient
Mesuring tape for length
How did you increase accuracy or reliability when mesuring the beach profile?
Used People the same height to increase accuracy of clinometer
Kept mesuring tape close to the floor
How may a beach profile be slightly inaccurate?
Isnt very specific if there are curved distances between gradient.
-> Change in gradient and mesure is subjective
Why is porlock bay a suitable location?
- Well-defined shingle beach and visible sediment movement
- Consistent prevailing winds allow LSD to occur regularly
- Safe and easily accesible for fieldwork
How do you mesure the size of the sediment?
Vernier Callipers / Ruler
measure the longest axis (length) of the pebble in mm or cm
VCs increase accuracy
How do you mesure the sediment shape?
Power’s Index of Roundness
How did you increase reliablility/accuracy of sediment size?
- Measured the longest axis consistently
- Used the same ruler or callipers for all
- Took a large enough sample size (e.g. 10+ pebbles at each site) to avoid outliers affecting results.
Repeated the method at several points along the beach using the same technique.
Worked in pairs to check each other’s measurements.
How did you increase reliablility/accuracy of sediment shape?
Used Power’s Index chart
Same person judged all the pebbles to keep the classification consistent.
Used a random or systematic sampling method to avoid choosing pebbles that “look interesting.”
Data Presentation
What are the advantages of beach profiles
Both profiles on same scale
-> Makes it easier to compare
Data Presentation
What are the disadvantages of beach profiles
Data is not Geo-located
-> Cant tell spacial relationships
Data Presentation
What are the advantages of Bar charts (Sediment size)
Easily compare sizes - same axis
- can see range
Data Presentation
What are the disadvantages of Bar charts (Sediment size)
not geolocated
Data Presentation
What are the advantages of GIS located proportional symbols (Sediment size)
- Can view spacial relationships between areas
- Can see location - can see factors that could affect it
Data Presentation
What are the disadvantages of GIS located proportional symbols (Sediment size)
Data not on same axis - harder to compare
Cant see range
