Fieldwork Physical Flashcards
Enquiry question
How effective are coateal management strategies in swanage bay
Key questions
Why is coastal management needed in swanage?
How effective are timber groynes to slow down LSD?
How effective was beach nourishment been at maintenance beach width
Atudy location and why was it appropriate
Swanage,dorest,south foats if england
-range of coastal management in different locations
-manageable size
-accessible location
-safe location
Safet risks
Drowning-not going into the sea
Weather- lots of water and suncrean if hot but cold lots of layers
Vehicles-use zebra crossing and look both ways before crossing road
Beach profiles method
Sampling – Systematic: One location in the ‘retreat the line’ management area and another in the ‘hold the line’ management area
Method – place a ranging pole at the sea and identify where the beach changed angle - place a ranging pole here. Measure the distance between
each ranging pole in metres. Measure the angle between the ranging pole by using a clinometer to look from the top of the red line to the red line
on the other ranging pole in degrees. Now look for the next change in gradient up the beach and repeat the steps above till you reach the cliff.
How foes besch profile method relate to answering quality of title?
-It shows how well beach nourishment has been at maintaining the width of thr beach as its one of key questions.
Beach peofiles sampling technique and sample size
Systematic and 30m
Sample size-strengths
-same person taking measurements-consitent
-every 2m-no bias
-numerical data
-no technical equipment needed-can be done by students
Sample size-weaknesses
-Human error
-changing titles-weather
-equipment
-beach hazards
-limited amount of data collected only visited on one day
Groyne profile method
-using a metre ruler measure drop down to the beach from top of groyne
-measure drop in metres and centimetres
-measure drop on north side and south side of first ten uprights
-then work out the average drop for the north and south side
-repeat this for 10 groynes
Groyne profile- how does method relate to answering enquiry title
It allows to record quantitative data on how effective groynes are at slowing down longshore drift
Groyne profile-sampling technique and sample size
Systematic sampling, measured the first 10 uprights
10/18
Groyne profiles-strength
-Simple and easy to do
-repeatable
-dosent recquire much equipment
-easily accessable to public
-dosent recquire a lot of people
Groyne profile-weaknesses
-depends on tides
-recquires a nearby beach
-recquires groynes
-time of day
-needs to be in a place where sea or ocean is accessable
-beach nourishment could impact trends
-did not measure all uprights
Conclusion
The ‘hold the line’ management of Swanage Bay through groynes and beach nourishment has created a steeper and wider beach
than the ‘retreat the line’ section. The managed beach was 22 metres wide, 3 metres wider than were no management had occurred. Meanwhile, the beach on the managed
section rose to 2.2m high, much higher than the 0.5m high in the unmanaged area. This is because the groynes have trapped sediment moving northwards along Swanage
beach and has deposited material. A wider beach in the managed area protects the cliff – it is protecting from erosion.
