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What has been the dominant direction of longshore drift in the past along Deal beach?

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Introduction

Aim 5 Question: What has been the dominant direction of longshore drift in the past along Deal beach? Aim: To collect evidence to show what has been the dominant direction of longshore drift, in the past, along Deal beach. Theory: Longshore drift is generated by wave and current action. Water and sediment are transported in a zigzag pattern as waves and currents approach the shoreline at an angle. This zigzag pattern is the mechanism for sediment transport as the swash is immediately followed by the backwash to the ocean. This energy created from the breaking waves allows for weak currents to carry large amounts of coarse-grained sediment down the shoreline. These weak currents, known as longshore currents, carry water and sediment parallel to the shoreline toward the down drift end of the beach. Method: For this aim we split up and took up a particular position in one of five groyne boxes. Once we were in our positions we took an ice cream tub and scooped up some pebbles much like the fieldwork in aim 2. We then selected five stones at random and measured their long axis and the angularity of the stones. This was repeated in every groyne box at every position. We also recorded if the stone was a pebble, cobble, or boulder. ...read more.

Middle

Angularity Stone type 1 2 3 4 5 6 7 8 9 10 Groyne Box 3- position 1 Stone number Axis length (mm) Angularity Stone type 1 20 Sub rounded Pebble 2 21 Sub rounded Pebble 3 16 Very rounded Pebble 4 8 Rounded Pebble 5 22 Rounded Pebble 6 8 Sub rounded Pebble 7 31 Very rounded Pebble 8 33 Rounded Pebble 9 21 Sub rounded Pebble 10 5 Very rounded Pebble Groyne Box 3- position 2 Stone number Axis length (mm) Angularity Stone type 1 34 Rounded Pebble 2 30 Rounded Pebble 3 24 Sub rounded Pebble 4 35 Sub rounded Pebble 5 38 Sub rounded Pebble 6 29 Sub rounded Pebble 7 32 Rounded Pebble 8 24 Rounded Pebble 9 26 Very rounded Pebble 10 21 Sub rounded Pebble Groyne Box 3- position 3 Stone number Axis length (mm) Angularity Stone type 1 41 Sub rounded Pebble 2 35 Sub rounded Pebble 3 67 Sub angular Cobble 4 68 Rounded Cobble 5 30 Sub angular Pebble 6 42 Sub rounded Pebble 7 57 Rounded Cobble 8 41 Rounded Pebble 9 38 Sub rounded Pebble 10 39 Rounded Pebble Groyne Box 3- position 4 Stone number Axis length (mm) Angularity Stone type 1 41 Rounded Pebble 2 25 Rounded Pebble 3 32 Sub rounded Pebble 4 76 Sub rounded Cobble 5 35 Sub rounded Pebble 6 43 Rounded Pebble 7 ...read more.

Conclusion

Angularity Stone type 1 2 3 4 5 6 7 8 9 10 Limitations: There were a few limitations in this aim; firstly we did not cover much ground whilst collecting data so there might have been some important facts we missed out on and there were old and new groyne boxes which might have had differences. To get a better sample we would have to collect more data in different areas of the groyne box. Analysis: I can immediately see that there are no boulders in any of the groyne boxes and most of the stones are pebbles with a few cobbles in the mix. Most of the stones are rounded or sub rounded however, there are a few angular stones but these are quite small in number compared to the amount of rounded/sub rounded stones there are in the groyne boxes. Conclusion: I can conclude that the sea is carrying the material parallel to the shoreline and that the bigger sized material is found nearer the sea (position 3 + position 4) and the smaller material is found near the sea wall (position 1 + position 2). I can also conclude that along the groyne boxes, the beach material is more plentiful position 2 e.g. material is stacked up higher. ...read more.

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