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Erosion and Deposition takes place at distinctive locations. Discuss.

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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.

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