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Walton on the Naze

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Walton on the Naze a) Describe and explain the natural processes operating on the Naze cliffs. All along the exposed side of the Naze cliffs, and to a smaller extent on the managed areas, erosion is constantly taking place. These are as such: Slumping The Naze cliffs are made up in layers. The base off the cliffs is a thick layer of very soft but impermeable London clay. Sitting on top of this are two permeable layers. The first is the Red Crag. This is made of reddish coloured sand and shells, which are the remains of an ancient seabed from 3 million years ago. The next thinner layer is of Glacial Materials, deposited from the last ice age. Slumping occurs when it has been raining heavily. The top two permeable layers become totally saturated with water and become very heavy. The water then seeps down and reaches the impermeable London clay. Now as it cannot seep through this layer it runs out of the cliff at the intersection between the layers. This causes mini streams and fountains to be seen on the cliff. This and the weight of the material on top causes it to slip off the clay onto the beach, where the loose material is quickly taken away by normal coastal deposition. Examples of this can be seen all along the unmanaged section of the Naze. ...read more.


b) Describe and explain the coastal management system operating between the Mabel Greville and the Tower Breakwaters. The area the Council of the Naze decided to manage was between what is now the Mabel Greville Breakwater and the Tower Breakwater. They did this to protect the valuable housing land. Sea wall The main way they did this was to build a large sea wall all the way along between the two breakwaters. This is quite a complex, and yet expensive, sea wall, but it is very effective. There is a diagram on the following page. The main part of the sea wall is made of concrete blocks that go up in a three step formation. Each step was about a meter in length. The purpose of this is to dissipate most of the wave energy before it goes anywhere else. This then leads up to the flat concrete slab revetment. This was about three meters long. The purpose of this was to again dissipate wave energy, and it also prevents terminal scouring. This then led upto the slanted wave return wall. This was slanted towards the sea so that any waves that did reach that far with any force would be turned back out to sea, and not onto the land. Beneath the Revetment and the wave return wall is a fill in of london clay. But beneath that at the level of the beach as it meets the sea wall is a sand sheet drain layer, to ensure the sea wall does not become too waterlogged and fall apart from the inside. ...read more.


In terms of environmental factors, without protection much land, vegetation and wildlife habitat would be lost to the sea. But on the other hand this is what is supposed to be happening, and putting in sea walls is going against nature. With the economic factors, it is obviously very expensive to put in, but if it is done well (like it is) it will last for a considerable amount of time, and should be worth the money. On the negative side, again the protection does cost a huge amount, and the council could put this into better use somewhere else, and could easily move the people to better housing away from the cliff danger and buy off any owned land and leave it for the sea. In terms of the political reasons it is more to do with the views of the local Tendring District Council. The view most of them had was that there was a problem and it should be fixed. The main problem was where the huge funds needed would come from. For how successful the project has been we only have to look at what it has achieved. Since the protection has been installed the cliff has not retreated at all. This is obviously a very effective solution and so is successful. Also the groynes have helped to build up the beach and retain a pleasant atmosphere. WALTON ON THE NAZE F IELD STUDY PHIL HIETT 12C ...read more.

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