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Why Is There Coastal Erosion At Dunwich?

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Why Is There Coastal Erosion At Dunwich? This question is asking for the reasons as to why the coastal erosion at Dunwich takes place. I have already shown that there is coastal erosion in question one, and now I am going to explain why this erosion happens. To show how the erosion takes place, I will look at many different factors: wave type, long shore drift, the geology in the area, and beach profile. Natural Erosion Fig 2.2 on page 3 shows the sand martins nests, which are a contributing factor to the erosion of Dunwich Cliffs. They make their nests by digging the soft cliff material out with their feet to make a tunnel like formation into the cliff. It is this removal of the beach material that constitutes to coastal erosion. Waves We measured the waves in order to see whether they were constructive or destructive. To work out this result, we had to take the information in two different ways: firstly to work out what type of waves there were, one person from our group had to go into the water with a ranging pole. ...read more.


3.586 � 4.808 = 0.745 This number is less than 1 so it confirms my earlier calculation that these are destructive waves. Long Shore Drift It is possible to tell from geographical sources which way the prevailing long shore drift direction is. If we look at Aldeburgh further south (fig 3.6), we can see that a spit has formed, south of the town. However, on the day that we visited Dunwich, we found that the long shore drift was taking the beach material north. Instead of taking measurements in those untypical conditions, we were given measurements from the previous year when the drift was heading southwards. The measurements were carried out by: throwing five wine corks into the sea, and observing them for ten minutes. Cork Number Distance Travelled (m) Direction Travelled 1 4.9 South 2 6 South 3 25.7 South 4 25.7 South 5 27.5 South Mean 9.476 South Long shore Drift Measurements There are some quite considerable differences in the distances travelled, but these could have been caused by a number of reasons. The ones with smaller distances could have just been bobbing around behind the point where the waves crests were breaking, and the ones with larger distances could have been caught in breaking waves, and had the full force of the swash acting upon them. ...read more.


39 22 29 27 28 29 24-26 -3 30 24 16 15 20 10.2 26-28 -11 0 0 0 0 0 0 28-30 6 21 16 36 36 20 29.8 30-32 -13 18 13 20 23 34 21.6 32-34 -8 0 0 0 0 0 0 Graph Geology At Dunwich, and along most of the Suffolk coast, the cliffs are made from unconsolidated fluvioglacial material. This is the sediment that was left behind when the glaciers retreated after the ice age. We can see this from the field sketch (Fig 2.5) where a layer of the cliff is made from pebbles. Because this layer of rock is not very compacted, it is more easily eroded than the rest of the cliff. Because this material is so soft, it slumps easily. Slumping is caused by rain saturating the cliff, making it heavier and less stable, which in turn causes a section of the cliff to collapse onto the beach. In this question, I have evaluated all the evidence for erosion in question one, and I have explained why the erosion occurs. There are many factors to the erosion at Dunwich and I have shown how and why they erode the Suffolk Coastline. ...read more.

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