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Investigation - Storm Beach Pwlldu.

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Investigation: Storm Beach PwllDu Introduction Pwlldu storm beach lies on the Gower peninsula in South Wales approximately six miles to the west of Swansea, it is a remote and sheltered beach. A storm beach is a ridge composed of shingle and pebbles, which is built up by storm waves at the inner margin of the beach. The pebbles at Pwlldu are situated on the beach, as there is an old coastal quarry present. Limestone from the slopes of Pwllldu head were quarried and then shipped to places such as Devon, where it would be used for agricultural lime. Coastal quarries like the one at PwlllDu were evident all around Gower from mumbles to Rhossili, the dipping strata, which characterises certain area of Gower, made Quarrying very convenient. . Other types of rock as well as limestone that appear on the beach are old red sandstone and sandstone, the diagram below (Fig 1) gives a more detailed view of the geology of PwllDu and the surrounding area. distance. It is interesting to note that the magnificent shingle-banks of Pwll-Du are probably entirely the result of the quarrying operations there. These rejected all fine rubble, because it took too long to load. ...read more.


Each group was allocated a transect where they would work to gather the relevant data. The data we were aiming to collect was pebble roundness at each selected location. To measure pebbles roundness it was decided that Powers roundness chart would be used. This was an ideal method of measuring roundness as it was not too time consuming and other methods such as Callieux roundness may have made it difficult to collect all the data we required in the time we had. Powers roundness index is a chart with six pictures of rock on it, each getting more and more round, with one being the most round and six being the most angular. We recorded the roundness of the stones on this chart for every stone selected. At each transect the group would work its way back inland and at different locations collecting and recording the pebble roundness of 50 randomly selected pebbles using the powers roundness chart. The number of locations where data was collected was in accordance with the amount of space and number of ridges on the beach. My group (group 1) only had 6 locations to record from as we were at the narrow west end of the beach where ridges were not quite as prominent as ridges at the eastern end of the bay. ...read more.


Discussion From studying the data can see that there is Conclusion I was very pleased with the way my project went. My group collected all the data that we set out to. I think the method used was successful to a certain degree, but did have some limitations. I know that it was successful in that the resultant data did prove to show a positive correlation. This aside there were areas, which I believe, could have made my work even more accurate than it was, and therefore improving my project. If I was to follow up this investigation I would have used different methods of pebble selection to insure it that it was totally random. For example we could have placed a large circle on the area we wished to collect data from to act as a boundary marker and only chosen pebbles from within this selected area, insuring that we selected from a specific area. We could also have taken more pebbles at more transects along the storm beach. Acknowledgements I would like to offer my thanks to the other members of group one, Jonathan and Antomia, for the help and contribution to this investigation. Also I would like to thank the members of staff for accompanying us on this trip and finally the taxi driver who dropped us at Pwlldu bay after we missed the bus. ...read more.

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