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# To examine and explain the changes in river width from source to mouth.

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Introduction

Objective Analysis This is now the most important part of the investigation. I shall now take all my results and graphs and sum everything up, relating to class work, textbook theories and other pieces of information. I will analyse and interpret the results that I collected, as it shall give me a better understanding of rivers and my overall results! I will now take each objective and explain it to the optimum of my ability. Objective 1 To examine and explain the changes in river width from source to mouth. From examining my compilation of results, graphs and cross sections, I get the distinct impression that as we moved from the source to mouth, the rivers width increased. By looking at the graph showing width against distance from source, I can see more precisely, where the steepest rises were. ...read more.

Middle

The widening of the river channel was caused by 3 types of erosion- Hydraulic power, Corrasion and Corrosion. Hydraulic power occurs due to the shear force and weight of the rivers load rubbing and creating friction against the rivers bed and banks. This process gradually wears the bed and banks away and especially causes the removal of loose clay and sand. This process is even fiercer when the river is in flood because there is more gravitational potential energy due to more mass in the water. As there is more mass the water will travel faster, wasting more energy overcoming friction but by also rubbing harshly against the rivers bed and banks. Another big affecter in the widening of the river channel was Corrasion. Corrasion or sometimes called "Abrasion" occurs when particles of sand and silt are carried along in the river. ...read more.

Conclusion

There is more energy available for erosion as we move downstream due to the bed load becoming smaller and more rounded which shall cause the river to become more efficient and travel at a greater speed as it has more energy. In the middle course of the river, Lateral erosion took place. This basically describes that as you move from the source to the mouth of a river, the width will most definitely increase due to the factors that I have before stated. If you look back over the pictures I took in the site information category, you will see a huge difference in width when comparing site 1 to site 4. Site 4 is extremely wider with boulders on the banks. Site 1 was a small little stream with lots of sharp jagged rocks, which was one of the primary constituents in causing the small width. Below I have put the 2 photographs together so you can judge for yourself. ...read more.

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