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The object of this essay is to highlight, find and tell you about rivers. Looking and investigating all aspects of it and noting what I find here is what came of it.

Extracts from this document...

Introduction

Section: Page: Introduction 3 Upper Course 4 Middle Course 6 Lower Course 8 Methodology 9 Presentation of Results 11 Data Analysis 13 Evaluation 14 Introduction: The object of this essay is to highlight, find and tell you about rivers. Looking and investigating all aspects of it and noting what I find here is what came of it. Rivers begin by a little stream called the source and end up as a mouth. These flows of water are strengthened by many tributaries, which join the main river at a confluence. The source is normally a natural spring coming from high up in the mountains or a hilly area such as v-shaped valleys. The source and the whole river is placed in an area drained by a river called the Drainage Basin-. -Drainage basin The natural spring is a run-off from precipitation, which then shoots out of the ground to form a source. There are many changes from the source to the mouth such as the shape of the channel (width and depth), the velocity, wetted perimeter, rate and type of erosion, deposition, sediment sizes and human uses. -Picture of river spring -Picture of river source Upper Course In the upper courses of the river e.g. ...read more.

Middle

Deposition is the cause of many features: A big change we find in the Lower course is ox-bow lakes. This is where the meander bends become larger and more vigorous as the river flows down stream. The continued erosion on the outer bends and deposition on the inside bends will eventually lead to the formation of Ox-bow Lake. The neck of the meander narrows as erosion continues on the outside bends. Over time of this erosion the neck is broken. This creates a straight channel. Eventually the Ox-bow Lake dries up, forming a meander scar. A flood plain is the wide, flat area either side of the river in the lower courses. A flood plain is formed by deposition and erosion. The erosion on the slip off slopes provides sediment to build up the valley floor. This added in floods to the surrounding lands, which are flood plains. As the water from the river floods in to the flood plain there is more friction created. The water is shallow and the river's velocity falls. The load then precipitates out the surrounding flood plain as alluvium. Methodology: The aim of our course was to note the change from the source of the river to the mouth. ...read more.

Conclusion

Evaluation: Overall out of all my findings and testing I believe I have carried out a fair test. So in total I accept my Hypothesis. There were many things that could or could not affect my findings these are as follows. On testing for the velocity of the river, the way in which we stand could interfere the flow of the water. This could be greatly improved by getting an electronic such as a speedometer device so a fair test is completed. The only other factor that can change is the sediment size. To find the average sediment size I randomly picked five sediments that I came across. This may not be a representative sample as the size can vary greatly. Maybe sectioning of an area of the channel and picking a larger number such as 50 sediments to complete a fairer test could improve this. I think my results are valid. But there are many changeables, such as the amount of precipitation the week before could greatly affect the river in the areas of velocity, width and depth of the river if there is more water running though the river the deeper and wider it will be and therefore faster. But the erosion will not be greatly affected this is a change which happens over greater periods of time. 1 ...read more.

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