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# To test if longshore drift is taking place along Deal beach

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Introduction

Aim 4 Question: Is longshore drift taking place on the day of our visit? Aim: To test if longshore drift is taking place along Deal beach on the day of our visit and if so, in what direction is it taking place. Theory: The waves move material up/down/along the beach; this is closely related to aim 2 where we measured the berms and ridges on the beach. Longshore drift moves material up and down the beach so we can find if the waves are particularly strong on the day we visited. Method: Firstly we measured wind speed at six different locations using an anemometer; the locations were at the start of site 1 profile survey, end of site 1 profile survey, Deal pier, longshore drift site, groyne box site and just before leaving Deal beach. ...read more.

Middle

After five minutes, the distance traveled was recorded and this took place for thirty minutes. Results: Location Wind speed (mph) Wind direction Temperature (�c) 1 10.5 SE 16 2 12.2 S 19 3 6.3 S 21 4 8.7 S 26 5 5.9 SW 17 6 4.5 SW 27 Longshore drift (pebble) Time taken (minutes) Distance traveled (meters) 5 3.80 10 6.50 15 9.75 20 10.15 25 25.30 30 28.40 Longshore drift (wood) Time taken (minutes) Distance traveled (meters) 1 5 2 3 3 5 4 0 5 -1 6 -8 7 -4 8 15 9 -4 10 -3 Results2: Location Wind speed (mph) Wind direction Temperature (�c) 1 13.1 S 17 2 11.0 S 21 3 7.3 S 25 4 6.7 SW 26 5 5.7 SW 19 6 4.5 S 27 Longshore drift (pebble) Time taken (minutes) ...read more.

Conclusion

This was most visible on the wood test; the plank of wood began drifting Northwards but then drifted more to the South causing our results to go into minus figures. The wind direction was south mainly so this is not surprising and the results in the return visit, where the wind was also Southwards, was more reliable and the figures were positive. Longshore drift on the seabed was also taking place and it started off slowly but as it progresses further into the sea, the pace at which it was being moved picked up especially in the last ten minutes. Conclusion: Longshore drift was taking place on both days of our visits and both towards the south. The wind direction readings also showed this and so did the wind speed. Both tests indicated this however we may have had some anomalous results in the first trip however this was cleared up in the return visit. ...read more.

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