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Investigate the dominant Coastal processes acting on Porlock bay and also consider suitable management strategies for Porlock bay.

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Introduction

Introduction Aims: * To investigate the dominant Coastal processes acting on Porlock bay. * To consider suitable management strategies for Porlock bay. This is an Investigation into the Coastal processes occurring in Porlock Bay, Exmoor National Park. Porlock bay is a bay that has two points, which are Gore Point and Hurlstone Point. These two points were built because there was soft rock in between two hard rocks so it became a bay. This is a famous area for the tourists that go on holiday there because it is quiet and has beautiful natural scenery. It is also famous because of its geographical processes. This bay also has farmland growing on it. Hurlstone point is at the West of Porlock Beach and is in the position of the end of Long Shore Drift. Therefore Hurlstone point had more rounded rocks. Hurlstone Point also has a cliff stopping the Long shore drift so that's why it might have more shingle on this point because the cliff (fig 1) acts as a natural barrier that blocks the rocks so they build up. (A map of the 2 points is provided on the next page) Gore Point is in the east of Porlock Beach and is in the position where LSD starts because the winds refracting and creating waves that hit at Gore point in a West direction. Because Attrition wouldn't be able to start its process, the rocks here are angular and sub-rounded. This place also has a groin that is man made. These are pictures of the 2 points on the next page: Photos of Hurlstone and Gore Point Coastal processes involves a lot of things, like what influences Coastal processes like: 1.Geology Geology is the type of Earth you are investigating for example there is hard rock which is more resistant and soft rock which is more vulnerable to coastal erosions. (Fig 2, 3, 4) ...read more.

Middle

5.0-7.4cm 23 78 7.5-9.9cm 28 53 10.0-12.4 41 30 12.5-14.9 33 19 15.0-17.4cm 35 4 17.5-19.9cm 15 7 20.0+ 25 0 Discussion and Analysis In this section I will discuss and analyse the graphs that I have created. Pebble Size I will start with the Bar graph that shows the Pebble size in Gore Point and Hurlstone point. We can see from this graph that 5.0-7.4cm sized pebbles were most common with 78 pebbles in Hurlstone Point and 20+ sized pebbles were least common with 0 pebbles. At Gore Point we found that 10.0-12.4sm sized pebbles were most common and 0-2.4cm sized pebbles were least common. (Fig 16) The reason for these results is all to do with Attrition and Abrasion. Attrition hadn't taken place at Gore Point because that is where the process starts by the North Sea Winds refracting and attacking the Headland, therefore there are bigger pebbles in Gore Point. But because of Long Shore Drift Hurlstone Point has smaller pebbles because the Pebbles were rubbed against each other, therefore chipping the Pebbles into smaller pieces. Abrasion also takes of making the pebbles smaller because the Pebbles get slammed or hurled at the headland also breaking it into smaller pieces. My hypothesis stated that the pebble size at Gore point will be bigger than in Hurlstone Point because attrition hasn't had a chance to take place and my results agree with this. Pebble Shape The Pie Charts shows the pebble shape at Gore Point and Hurlstone Point. We can see from the Pie chart that Sub Rounded pebbles were the most common at Gore Point with 30% of the pebbles and the least common type of pebble was the Very angular Pebbles with only 6% of the pebbles. But at Hurlstone Point the most common pebble is Very Rounded with 54% and the least common is the Very Angular pebbles with 0% of pebbles. ...read more.

Conclusion

This is because Hurlstone point is at the stage of the end of long shore drift which means attrition and abrasion has taken place. Attrition and abrasion is when the pebbles either bump into each other or rub/roll onto each other. For this reason the pebbles are then chipped into smaller pieces. My hypothesis was correct as my results of this investigation comply with the things that I hypothesised would happen. "The pebbles at Gore point will be more larger because attrition hasn't had any chance to begin its process while the rocks in Hurlstone point will be smaller because attrition chips of rough edges as the rocks knock onto each other." Long shore drift affects the pebble size in Porlock bay in the way that in Hurlstone Point there is smaller pebbles than there are in Gore Point. (Fig 21, 22) Hypothesis 3: Pebble Shape My conclusion for the Pebble Shape is that the pebble shape at Hurlstone was more proned to be rounded and in Gore Point the most common shape is sub-rounded. The reason for this is very similar to the reason in pebble size. Attrition and abrasion has taken place in Hurlstone point because it is in the process of the end of long shore drift and in Gore point it is in the beginning of long shore drift therefore more angular pebbles were found. My hypothesis was correct as my results states that the pebbles are more rounded at Hurlstone Point than in Gore point. "I also hypothesise that the pebble size will be bigger at Gore point and the pebbles at Hurlstone Point will be smaller because attrition/abrasion hasn't occurred in Gore point because long shore drift hasn't started yet and long shore has ended at Hurlstone point therefore Hurlstone having smaller pebbbles." Long shore drift has affected Porlock bay in the way that it made the pebbles at Hurlstone point more rounder than the pebbles at Gore Point. (Fig 21, 22) 1 1 ...read more.

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