Investigation on Coastal Erosion In Porlock Bay Essay

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Investigation on Coastal Erosion In Porlock Bay

Aims ----

Aim 1:

To find out if beach material is moved across Porlock Bay by longshore drift.

Aim 2:

To find out which type of sea defense is best for Porlock bay.

If L.S.D. (long shore drift) were taking place I would expect to find:

a) Deposition at one end of the bay and against any abstractions such as groynes.

b) An increase in pebble roundness in the direction of long shore drift. The process of attrition will erode the pebbles.

c) A decrease of pebble size in the direction of long shore drift, again attrition is involved.

d) Undercutting (active erosion of the cliffs at one end of the bay).
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Then after that we had gone to hurl stone point. There we saw a lot a lot of rounded pebbles, so we then again set up a beach profile experiment.

Introduction

We went on a Geography field trip with our class to Crowcombe in Somerset. Our class along with Mr Hopping went for three days and two nights, and stayed at the Youth Hostel. I studied and investigated Coasts. Which to be a bit more specific was interaction between sea and land. The general weather conditions were sunny with showery intervals.

There are five types of erosion as well as the four types of transport but first I will talk about the types of erosions. There are five different types, and they are corrosion or you could say abrasion, scouring, hydraulic action, solution and attrition.

Corrosion/abrasion is where the breaking waves scoop up stones and rocks fragments and hurl these at cliffs. This has the effect of chipping away at the rock, eventually breaking pieces off.

Scouring is waves that break at the base of a cliff swirl and remove loose rock with the strong current.

Hydraulic action is the pressure exerted by breaking waves and traps and compresses air in cracks. The intense pressure forces open the cracks further so weakening the rock.

Solution is where some rocks have a chemical composition which salt water can dissolve. In chalk and limestone, the calcium carbonate

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