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

Marine Processes

Extracts from this document...

Introduction

Marine Processes Erosional Processes Hydraulic action As a breaking wave hits a cliff a massive increase in pressure within cracks and fissures of the cliff can occur. When air within these fissures is trapped and compressed, massively increasing the pressure. As the wave falls back the there is an explosive effect of the air under pressure been released. This over a period of time may weaken and break off pieces of a rock or damage cliffs and sea defences. Abrasion Abrasion is the wearing away of a cliff by material the sea has picked up. Sand shingle and boulders are hurled at the cliffs by breaking waves. Over time this will do tremendous damage, abrasion is one of the most rapid and effective form of erosion on coasts which are exposed to storm waves. ...read more.

Middle

Consequently the swash and backwash of the waves come off at different angles; therefore we can expect and show that sediment moved up the beach by the swash will be brought back down by the backwash at a different angle, consequently further down the beach. This results in a zigzag migration of sediment along the beach by the processes of Saltation and Traction called long shore drift. Solution Limestone dissolved by carbonic acid in the seawater will me moved depending on where the wave travels to. Suspension Small particles of sand etc are carried along within the flow of the moving water. The material is likely to be the largest proportion of the sediment picked up by a breaking wave. ...read more.

Conclusion

Waves breaking directly at the foot of a cliff release far more energy than those breaking some distance away. Fetch How far wave has travelled determines the amount of energy collected. Sea Depth A steeply-shelving sea bed at the coast will create higher and steeper waves. Coastal Configuration Headlands attract wave energy through refraction. Beach Beaches absorb energy, lessoning the Erosional power of a breaking wave. Steep, narrow beaches easily dissipate the energy from flatter waves. Flattish, wider beaches spread out the incoming wave energy and are best at dissipating high and rapid wave inputs. Human Activity People may remove materials form the coastline (e.g. sand) increasing erosion. Sea defences built by humans may reduce erosion in one place only to increase it in another. Geology Some rocks are more resistant to erosion than others. ...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 Atmosphere & Weathering 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 Atmosphere & Weathering essays

  1. Atmospheric Processes - Depressions

    In the rear of the warm front the conditions again change slightly as the pressure falls and the clouds change to stratus or stratocumulus. The wind also changes becoming steady from the southwest. The cold front follows the warm front with marked changes in conditions.

  2. The Great Storm of 1987.

    Over the Hebrides, Orkney and Shetland, winds as strong as those which blew across south-east England in October 1987 can be expected once every 30 to 40 years Temperature & Pressure The 1987 storm was also remarkable for the temperature changes that accompanied it.

  1. Distinguish between the processes of erosion and weathering in an area undergoing glaciation.

    Sea level fell by at least 100 m and the beach was as much as 150 km further east along the Atlantic coast, thus forming land bridges between North America and Asia, which allowed for the migration of animals and humans to previously glaciated areas.

  2. Outline the challenges and opportunities for human activity in present peri-glacial environments

    This causes fracturing of the pipes as the ground moves. Similar earth movements have caused roads and railways to lose alignment and dams and bridges to crack. To combat this problem those living in permafrost areas have constructed an above-ground network of pipelines.

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