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# To Investigate How The Nature of The Cliffs Affects The Rate of Retreat

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Introduction

Objective 1- To Investigate How The Nature of The Cliffs Affects The Rate of Retreat Data required * Geology Of The Cliffs * The Height Of The Cliffs * The Volume Of Material Method The Geology of the cliff will be explained by the use of a simple diagram showing the rock composition and by a table about the different components and properties of the rocks e.g. appearance, colour, texture, hardness and permeability. To find the height of the cliff we use a simple mathematical method called trigonometry. ...read more.

Middle

Data Presentation Diagram Of The Composition of The Cliff: Boulder Clay + Gravel Red Crag (Sand) London Clay Appearance Rocky Sandy Rocky Colour Dark Grey Orange/ Dark Black Texture Sticky/ Soft Coarse Sticky/ Soft Hardness Crumbles Easily Sandy Crumbles Permeability - Very Absorbent - The cliff cross section shows evidence that it is very vulnerable to rotational slip, because its second from top layer consists of a material called Red crag which is very absorbent. The layer below the Red Grag, London Clay, is not at all absorbent. The water is rejected by the London Clay and acts as a lubricant between the two layers. ...read more.

Conclusion

This graph illustrates the amount of material removed and the height of the cliff at different points along the beach, The graph shows that the height of the cliff shadows the amount of material removed. i.e. The higher the cliff the more material removed. The smallest amount of material removed is positioned near the sea wall. Therefore the sea wall and other coastal defences surrounding that part of the cliff are obviously effective in slowing down the rate of erosion. Diagram showing the workings to find the height of the cliff; X = height of cliff near pill box Tan 26 = x x tan 26 59.5 x= 29 metres ...read more.

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