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Coastal Erosion and Deposition Landforms Durdledoor, Dorset

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Introduction

Coastal Erosion and Deposition Landforms Erosion Landform : Durdledoor, Dorset: Durdle Door is an arch which has formed parallel to the shoreline. It has formed due to the erosion of Wealden Beds (weak easily eroded clays) and Greensand (a relatively weak limestone) being quickly eroded either side of a section of more-resistant rock, forming the headland of Durdle Door. The resistant rock is made up of two adjoining sections of Portland Stone (highly resistant limestone) and Purbeck Beds (combination of shales, clays and limstones, varying in resistance). However, due to wave refraction the headland of Durdle Door has been particularly attacked by coastal erosion. ...read more.

Middle

The name " Durdle " is derived from an Old English word "thirl", meaning to pierce (as in "nostril"). A similar arched rock in south Devon is known as the Thurlestone. Deposition Landform : Chesil Beach, Dorset Chesil Beach is the longest shingle ridge in the British Isles. The tombolo is about 30km long, a third of which rests against the mainland. It join mainland Dorset with the Isle of Portland. For much of its length, Chesil Beach encloses a narrow lagoon known as the Fleet. The Beach is thought to be swash-aligned because of its straightness and the absence of any recurves. ...read more.

Conclusion

Chesil Beach contains between 50 and 100 million tons of shingle. This changes in size from very fine, 1-2 cm pea-sized material at Bridport to 5-7.5 cm potato-sized pebbles at Chesilton. It is comprised mainly of flint (from chalk), chert (from greensand) and a few foreign rocks, such as quartz from Devon. The variation in pebble sizes reflect recent wave activity, wave energy, variations in type of material, and commercial exploitation of the beach, where at present 27000 tonnes of shingle are removed annually. The berm is a maximum of 13 metres high. This beach of graded pebbles sits on an old beach of sand, silt and pebbles that is below low water level. Some suggest Chesil Beach may form its own sediment cell, as there is little evidence present that shows new material entering its system. ...read more.

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