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One method of data collection to be used in this investigation will take the form of slope profiles. Slope profiles provide reliable data as to whether a beach is prone to erosion or deposition.

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Introduction

Slope Profiles One method of data collection to be used in this investigation will take the form of slope profiles. Slope profiles provide reliable data as to whether a beach is prone to erosion or deposition. This data will allow the comparison of beaches along the area of investigation. From this evidence any changes in the coastline to the east of the harbour arm will be apparent. It will clearly indicate whether the building of the harbour arm has affected other parts of the coastline. This information will be valuable in proving or disproving the hypothesis that "You cannot change one part of the coastline without affecting another". If the harbour has effectively slowed down the process of longshore drift, which occurs from west to east along the channel coast, slope profiles will show if this has affected the line of coast immediately after Newhaven. The results will highlight any changes (in a coastal area that would have looked much the same before the harbour arm was built). ...read more.

Middle

This is because the material is deposited but not removed because the harbour arm prevents material being carried further along the coast to the east. The area of coastline to the east of the harbour arm, the Seaford and Birling Gap coast, will have small, short beaches and considerable cliff erosion. This is because the waves that hit this area have no load to deposit, as the process of longshore drift has been interfered with. The waves remove material from this area of coastline and carry it further along the coast. The slope profiles have been to drawn to scale, 1centimetre represents 2metres The slope profiles reveal what was expected, the beaches on the western side of the harbour arm are longer and have been subjected to more deposition than the smaller beaches on the eastern side of the harbour arm. Point 1 shows an unmanaged, gently sloping beach 13.4 in length, with a steep chalk cliff. ...read more.

Conclusion

Waves approach the shore at an oblique angle, not at right angles. The backwash is at right angles to the shoreline. The harbour arm prevents longshore drift from carrying out its normal process, so that when it deposits sediment at point 3 it is not able to retrieve it. This causes a build up of beach sediment and in turn longer beaches. Points 1 to 3 show how the harbour arm has slowed down the affect of longshore drift and causes an increase in the length of the beaches. Points 4 to 6 show a reversed process to points 1 to 3. Because of severe erosion occurring at points 4 and 5 the beaches have to be artificially replenished. If this type of coastal management was not carried out, the beaches would disappear and the sea would begin to erode further inland. The results of the slope profiles are favourable in support of the hypothesis that "You cannot change one part of the coastline without affecting another". The harbour arm has had an effect on the beach and cliff formation at Newhaven, Seaford and Birling Gap. ...read more.

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