physical fieldwork

name of physical

How effective are the coastal management strategies in swanage bay?

Secondary data

Geology map —> rock formations and wave energy

Sediment transport map —> longshore drift directions

what strategies are there?

• sea wall

• groyne

• beach renourishment

• 18,000 tonnes sand

What did we do?

beach profiles

groyne profiles

method to collect data groyne profiles

1. tape measure - width of beach from hig tide mark to sea wall

2. at first groyne uprigh on north side measure distance from top to sand

3. repeat on south side

4. repeat for all uprights

5. repeat for all groynes

strengths and weaknesses of groyne profiles

• pro

  • systematic sampling

  • quantitative data - easy compare

  • reliable equiptment for results

• con

  • only did 14/18 groynes due to tide

  • snapshot in time

  • tide dependent

  • human intervention eg. build up beach outside hotel

method beach profiles

1. place first ranging pole at high tide mark

2. place second ranging pole 2m up beach using tape measure

3. use clinometer to measure angle

4. record angle

5. remove RP1 and place 2m up from RP2

6. repeat until sea wall

pros and cons of beach profile

• pro

  • systematic sampling

  • quantitative

  • equiptment is precise

• cons

  • tide dependent

  • variables for people

  • only did 2, one at Banjo pier and 1 at groyne 12

presentation of profiles

groyne - bar chart of distances north vs south on bars as you go down beach

beach - beach profile graph, distance from sea on x axes and angle on y axes

results from groyne profiles

• as down beach, sediment levels decrease

• south side shorter drop thsn north side

• except 10 - due to tourist access path for hotel

• drops range 37cm to 138cm

• large drop groyne 5 due to water pipe to sea, washing away sediment

results beach profile

• down beahc much shorter and steeper

• shorter by 8m

• ange changes up to 7 degrees

• by banjo pier max 3 degrees