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

Erosion and Deposition takes place at distinctive locations. Discuss.

Extracts from this document...

Introduction

Erosion and Deposition takes place at distinctive locations. Discuss. Erosion is defined as the removal of soil, sediment, and rock fragments from the landscape. More commonly erosion is the wearing away of land. Most landscapes show obvious evidence of erosion. Erosion is responsible for the creation of hills and valleys. It removes sediments from areas that were once glaciated, shapes the shorelines of lakes and coastlines, and transports material downslope from elevated sites. The river uses transport in material to erode away at banks and beds. As the velocity of the river increases so to does the load, which increases erosion. There are four different types of erosion; these are attrition, hydraulic action, corrosion and corrasion. Attrition is the process where by rocks collide with each other and break up into smaller pieces. Hydraulic action is the force of water on river bank which undercuts and removes material. Corrosion is related to the chemical composition of the water and corrasion is when rocks bounce against side and bottom of river and break off more material. Deposition is a landform formed from the deposition of weathered and eroded surface materials. ...read more.

Middle

When the river reaches site B there is major depositioning, small boulders, cobbles and pebbles are deposited first as the river enters Llyn Gwynant, the first lake on the rivers course. Between sites B and C different landforms occur. Here there are rapids and small meanders cased by this depositioning effect. As you can see the diagram below illustrates the rivers load, this can tell us the ways in which the river carries its material and how it will deposit this material if the river loses its velocity. As the water leaves the lake it picks up velocity again as the slope gradient increases. Transportation begins to occur again but only in the form of a small amount of bedload, there is however much suspension but little solution. This tells us that at this point of the rivers course the velocity is not great enough to transport great amounts of material. There are also signs of erosion, in the form of attrition and corrasion. There is a little amount of hydraulic action and corrosion. In the next three kilometres the river enters Llyn Dinas, where pebbles, gravel, sand and clay are deposited. ...read more.

Conclusion

Deposition occurs on the inside of the bend where the water is shallower and slower. Meanders can migrate or move due to this erosion and deposition that occurs. You can measure the curving nature of these meanders using the formula below: Actual channel length Straight line distance The higher the number the greater degree of meandering. If you came out with a ratio of 1:5 that would equal a high amount of meandering. In conclusion, erosion and depositioning do take place at distinctive locations, however it is relative only to that specific river. For example you couldn't say that because 20 meters downstream on one river you find a lake, on all rivers 20m downstream you will find lakes. Velocity has a major impact on the way all these features are made, is there is a great amount of velocity erosion is very likely to occur, if there is little velocity then deposition is likely to occur. Velocity can also be influenced by the amount of water and how it has entered the river. So erosion and deposition can be used to determine the locations of various land forms however only relative to a specific river. ...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 Hydrology & Fluvial Geomorphology 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 Hydrology & Fluvial Geomorphology essays

  1. Case Study on The Three Gorges Dam in China

    This can lead to an alteration in aquatic conditions which could affect many river creatures negatively. The build up of silt can also clog up the dam, preventing water from flowing through it easily, leading to a reduction in the efficiency of the hydroelectric power turbines.

  2. Fluvioglacial Landforms

    to the valley floor. These streams then loose their energy and deposit their load producing the small mound which can be found today. The other theory of how delta kames are formed is that supraglacial streams deposit material as they enter the ice marginal lakes however it is also possible that debris-filled crevasses during an ice retreat.

  1. To what extent are fluvio-glacial deposits and landforms distinctive?

    These processes are dependent upon various factors. For example the geology of the underlying rock; the less resistant the rock type the greater the rate of erosion and therefore the greater the impact on the landscape. The rate or success of plucking is quite heavily influenced by the structure, or amount of jointing present in the rock,

  2. To assess whether the modified channel of the river ash is effective in reducing ...

    Furthermore, as the water is moving it is hard to tell where the surface of the water is so it would be hard to keep the poles on the surface. If this happened, the clinometer would not be at the right level, so inaccurate results would occur.

  1. Main features and landforms of glacial erosion.

    Plucking could occur because as the ice moved up the stoss slope there was a reduction in pressure, allowing liquid water to re-freeze and attach the ice to the underlying rocks.

  2. Investigate how the velocity of rivers changes.

    I also predict that the velocity of the river will be decreased due to man's interruption of reinforcing the banks. Hypothesis This is because at the centre of the river the velocity is faster as there is little friction so therefore the water can travel faster.

  1. How does Loughton Brook change as it moves downstream?

    This proves that as we go downstream the river becomes more efficient. As you can see from the graph there is an anomaly at site 10. The relationships between these two features are fairly strong. The main reason why the velocity increases as we go down stream is that the

  2. Do the Characteristics of a river change downstream?

    The section of the River Wharfe shown on appendix 2 illustrates the river to encompass a meandering path. It is clear that the area is flat due to the lack of contour lines on the map. The altitude for that area is approximately 100m above sea level.

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