• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Beach profiling

Extracts from this document...

Introduction

Describe and explain how attached beaches vary in both plan and profile. A beach is a geological landform along the shoreline of a body of water. It usually consists of loose particles which are often composed of rock, such as sand, gravel, shingle, pebbles, or cobble. The particles of which the beach is composed can sometimes instead have biological origins, such as shell fragments or coralline algae fragments. Beaches often occur along coastal areas, where wave or current action deposits and reworks sediments. Although the seashore is most commonly associated with the word "beach", beaches are not only found by the sea or ocean: beaches also occur at the margin of the land along lakes and rivers where sediments are reworked or deposited. A profile of a beach is a cross section of the landform showing the shape, length, steepness and features. A plan of a beach is a bird's eye view which shows it's shape in relation to surrounding features. ...read more.

Middle

The steep gradients created by this reflect the wave energy and encourages the more destructive plunging breakers. This encourages berms to develop at the point where the wave is at highest energy resulting in storm beaches and high tide ridges. As well as the sediment having a role of shaping beaches, the dominant wave type can also influence the beach profile. Constructive waves, which are swell wave from a long fetch, are long, low in relation to length and relatively infrequent with 6-8 arriving in a minute. These types of waves are commonly found on low gradient beaches and tend to break near the shore and as they have travelled across such a large distance the energy of the waves is dissipated allowing the sediment to remain on the beach. Whereas destructive wave, which are local storm waves with a short fetch, are short, high in relation to length and are more frequent with 10-12 arriving in a minute. ...read more.

Conclusion

With no erosion there was no new sediment being added and longshore drift continuing, beach levels decreased. Beach plans can tell how beaches are shaped and are maintained by the view from above. There are 3 main shapes a beach can take. Swash aligned beaches are beaches where waves are refracted between headlands and approach the shore at right angles, with wave crests parallel to the beach. The dominant movement of material is up beach, swash, and back down the beach, backwash. This creates stable features and although the profile may change due to changes in the sweep zone processes, the plan alters very little as there is no appreciable net gain or loss of material. Drift aligned beaches are where wave approach the coast at an angle. Longshore movements of sediment build out the beach to ensure that the optimum angle for sediment movement is achieved (40�-50�). Sediment is added at the same rate that longshore drift is happening so that no material is lost. ?? ?? ?? ?? Chris James | 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Coastal Landforms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Coastal Landforms essays

  1. "An investigation into the methods of coastal management along Brighton's Coastline and the reasons ...

    question about how the people I questioned travelled to Brighton; it appears that 4 people used 'other' means of transport and 3 people's answer to this question suggests that they have lived here all their life, therefore 3 out of the 4 people who have said they have used 'other'

  2. An investigation into how beach material varies in shape and size up the beach.

    There were exceptions due to the random selection of the pebbles in the quadrat so at whatever point up the beach there were always going to be pebbles that did not conform the rule. For example at 5m there was a pebble with a long axis of 10cm, which was

  1. Coastal Processes

    The land would never be flooded and the steel rod running through it will prevent any erosion, taking place on this sea wall. At the current moment a sea wall stands in the populated area of Minehead, Porlock Bay. Its effect upon the beach is very positive although it is very unattractive and highly expensive.

  2. Investigate the effects of costal processes on Porlock Bay in Somerset and also to ...

    I think this is because of long shore drift taking place at Porlock Bay. Section 2 Pebbles Pebble Size The 30 pebbles that I measured showed me instantly that the pebbles at Hulstone Point are smaller than the pebbles at Gore Point.

  1. How does beach sediment vary along the coast between Lochranza and Catacol?

    8.32 1.82 400 9.14 3.76 450 6.30 1.20 500 8.98 1.89 Also I have drawn 2 scatter-graphs with the data above. The mean b-axis graph is on page 5 and the standard deviation graph is on page 6. Analysis of the graphs - After studying the graphs I can safely

  2. How and why does Beach Characteristics

    * Fill to the top with water and start the watch. * After 1 minute measure the distance with the ruler that the water has gone down by. Justify * Method was chosen to demonstrate the rate at which water will infiltrate the beach material.

  1. Investigation - Storm Beach Pwlldu.

    or weather human activity related to the quarrying has affected the bay. Finally I will aim to discover weather pebble roundness on the bay is affected by any means. Initialy I will be using just data from my own group, group one.

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

    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 Risk

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work