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An experiment to see if Longshore drift will occur in direction of the prevailing wind.

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Methodology Day: Tuesday Date: 11th June Time: 10.30 am - 6.00 pm Weather: The weather was fairly cold in the morning and eventually turned sunny. However, later in the day it started drizzling. It was also very windy. A list of the equipment used: * Ranging poles * Spirit level * Metre Rulers * Quadrats * Cailleux Roundness Index Five different groups were spread out at equidistant spacing along the beach. Group A will be located to the east of the beach, closer to Durdle Door and Group E will be to the west, closer to Bats Head. Hypotheses: Physical * Longshore drift will occur in direction of the prevailing wind. The prevailing wind is the wind which blows most frequently in an area. The prevailing wind along the south coast of England is generally SW. The waves are influenced by the SW wind, and they travel in the same direction as the wind. The waves carry boulders pebbles, sand and shingle in strong weather. As the wave reaches the water edge, they break because the friction increases. The swash carries the material up the beach at the same angle as the waves. The swash deposits heavy material close to the water's edge as it begins to lose energy. The backwash returns to the sea under the influence of gravity dragging some material with it. Longshore drift occurs from the west to east in a south-westerly wind. ...read more.


This was proved by throwing an orange into the surf zone for exactly 5 minutes. The direction and distance it moved was observed. This was repeated 3 times, on order to calculate the average of the three distances, in order to get accurate results. An orange was used to test this hypothesis as it is easy to see and is biodegradable. To prove the above hypothesis the data that was collected was recorded in a table shown below: LONGSHORE DRIFT MOVEMENT IN 5 MINS 1. METERS 2. METERS 3. METERS WIND DIRECTION _______________ DIRECTION OF LSD _______________ * The height of the beach should increase towards Durdle Door. This will be tested by measuring the beach profile using the ranging poles, a metre ruler and a spirit level. A ranging pole was placed at the edge of the beach near the shoreline and the other one a metre away up the beach. The metre rule was placed between the poles keeping it absolutely level by means of the spirit level. To prove the above hypothesis the data that was collected was recorded in a table shown below: METERS FROM SEA DIFFERENCE IN HEIGHT LONG AXIS OF PEBBLES IN CM PEBBLE ROUNDNESS 1 2 3 4 5 Average R=2r/a x 100 * Pebbles decrease in size from west to east and become rounder as a result of longshore drift. ...read more.


It will also show if the pebbles are affected by attrition or not. Comparisons will be made between each group to show the changes in length and size. * Pebbles decrease in size with increasing distance from the shoreline to the cliff. The results for this hypothesis are useful as it will show effect of longshore drift on the waves and it will show where attrition occurs. Human * Lulworth will be a honey pot site as there will be more tourists than residents in the area. The results for this hypothesis are useful as the will show if the area is tourists orientated. * Lulworth Cove will have a large sphere of influence. The results for this hypothesis are useful as they will show how popular and accessible Lulworth cove is. If Lulworth Cove is a honey pot site, it is expected that there will be a large number of tourists. This method is useful as it provides a good method of collecting the data efficiently without troubling the tourists by asking them questions. * The tourists visiting the area will be a variety of ages. The results for this hypothesis are useful as they will prove that Lulworth Cove has facilities for all ages. This is useful as the question allowed the data to be collected in different categories. Therefore, during the interview, this question will not need to be asked as the categories are broad enough to minimise errors. To help me complete my analysis, I have researched and used secondary data OS Maps These are helpful as they show ...read more.

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