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# An Investigation into Sediment Transport along a Beach and The Ways in Which Coastal Processes Such as Transport are Managed.

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Introduction

An Investigation into Sediment Transport along a Beach and The Ways in Which Coastal Processes Such as Transport are Managed. A student wanted to examine a shingle beach that was located between two headlands. She wanted to see if the pebbles at one end of the beach were any different to the pebbles at the other end. She thought she would look at the size and shape of the pebbles. She collected 50 pebbles at each end of the beach. Below is a plan of the beach. The pupil's results taken from sites 1 and 2 showed. Site 1 Pebble Size Site 2 Pebble Size 0-4cms 4 0-4cms 11 5-9cms 7 5-9cms 14 10-14cms 12 10-14cms 12 15-19cms 10 15-19cms 13 20-24cms 11 20-24cms 0 25-30cms 5 25-30cms 0 More than 30cms 1 More than 30cms 0 Site 1 Pebble Shape Site 2 Pebble Shape Very Angular 14 Very Angular 2 Angular 30 Angular 4 Rounded 6 Rounded 26 Very Rounded 0 Very Rounded 18 Analyses 1: What is the Nature of Sediment Transport on this Beach? ...read more.

Middle

Erosion only happens when the pebbles are in water and for the pebbles to be in the sea must mean that they are being transported and beach material is transported along the beach in four ways: Traction - boulders and cobbles are rolled along by powerful waves. Saltation - pebbles are bounced along by waves. Suspension - sand and silt are carried in suspension. Solution - calcium carbonate and salts are dissolved in the seawater. I think the most likely form of transportation on this beach is Saltation because as the pebbles bounce any rough edges will get knocked off making the pebbles smother and smaller. So along this beach there is Saltation and attrition taking place. The pebbles will also be moving along the beach between sites 1 and 2; this process is called longshore drift or LSD for short. Analyses Two How and why is The Transport of Sediment along This Beach Managed? ...read more.

Conclusion

It costs � 500 per metre, but this ignores repair costs. Stone Gabions This is a strong steel cages filled with rocks and some surface sand on which salt tolerant grasses can become established. It costs � 200 per metre, but gabions have the big disadvantage of being ugly constructions Sea Wall This is made with stone or concrete. It usually has a curved top to reflect wave energy back on to the next advancing wave. A concrete promenade can be built on top of the wall. It costs � 5,000 per metre. Embankments These are high walls that are situated where a beach meets the land or cliff. They are usually made of concrete or stone and bounce back storm waves. Beach Rebuilding The sand that is lost through longshore drift is replaced every year, but this is very expensive and a long task. These are all useful and effective methods of coastal defence and they are all worth while investing into, the only problem with them is that they are all expensive. None of these are permanent so they have to be replaced every few years. ...read more.

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