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Erosional Landforms on the Dorset Coastline

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Erosional Landforms on the Dorset Coastline Introduction In this leaflet I am going to present my findings about different types of erosion, and at how they take effect different locations. The relevant locations that I have studied are part of the Dorset coastline. These are: 1. Lulworth cove, a bay created through millions of years of erosion. 2. Stairhole, a deep cleft that represents stage 1 of the evolution of the coastline. 3. Durdle door, an arch that will soon collapse and erode away. Types of Erosion Erosion is the gradual wearing away of land by water, wind and general weather conditions. The amount of erosion depends on the power of the waves and the rock type. The amount of energy acquired by waves depends upon the wind velocity, the duration of the wind and the distance over which the waves have traveled. This is known as the fetch. There are two types of erosion that can occur at the coast, these are: 1. ...read more.


* Corrosion- the process by which a chemical reaction occurs involving rocks such as chalk and limestone and sea water. Lulworth Cove Lulworth cove is a curved bay situated at the very bottom of the United Kingdom, on the Dorset coastline. It is well known for being one of the most well known stretches of coastline in the United Kingdom. It is a prime example of how the land can erode over many years. In this area all the rocks were formed underneath the waters surface. These rocks include limestone, sands and clays, and chalk. The rocks appear buckled from underneath the water, this is due to the rocks being folded through 50-90 degrees. The coast around Lulworth Cove demonstrates every stage in the development of bays and headlands and how that development is controlled by the underlying geology. Below is a sequence of pictures showing how Lulworth cove and Stairhole were created, and what may happen in the future. ...read more.


This in time will erode and join with Lulworth cove to form an even larger bay. Durdle Door Durdle door is an arch, these are created in headlands after erosion has formed caves from either side which eventually meet. The resulting arch is not a permanent feature but will eventually collapse creating landforms called stacks, which in turn will be further eroded to form stumps. Natural arches such as Durdle Door form as a result of the softer rocks being eroded away behind the hard limestone, allowing the sea to punch through them. Conclusion From the information I have found I can see that each of the landforms I have studied are at the same stages in the evolution of the coastline. Lulworth cove and Stairhole are both in the second stage. When they move on into the third stage the two will meet and combine into one large bay. Durdle door is also at the second stage, when it moves into its third stage the landform will erode even more, and the arch will collapse creating a stack. ...read more.

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