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Investigate how the river Breamish's characteristics change from source to mouth.

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Introduction

Aim In our enquiry we are going to investigate how the Breamish's Characteristics change from source to mouth. We are going to see which aspects of the river will change. The aspects that we will be measuring are going to be whether or not the velocity, bedload, bedload shape or width will change as the river travels from the source to the mouth. Identifying questions and issues I have decided to examine and measure the changes in the rivers velocity, width, rock classes. I will be measuring these as different points downstream. We will be split into different groups, some will be measuring at the source, some at the mouth and some half way in-between. I am expecting that the rivers velocity will increase from the source to the mouth. The river will become faster flowing because of erosion, which will cause the bedload to become smoother, this means there is less friction acting on the water. This will make it flow faster and more freely. I predict that the river will become wider from the source to mouth. My reasoning behind this is that lateral erosion will cause the banks to wear down, meaning that the river will become wider as the river moves downstream. ...read more.

Middle

If this is not done properly we could get an inaccurate reading. We will repeat this at 5 intervals downstream. Bedload To get an accurate reading of the bedload, we will be using the callipers. If these are used correctly they will give us an accurate reading. We will be measuring the longest side of the rock. This could cause problems with the result if this is not followed. We are going to be using a chart to determine what kind of stones we are measuring. To get an accurate reading we are going to be sampling about 20 stones, at different parts of our site. We will be repeating this process at all of our site downstream. Depth To accurately get a reading of the depth we will have to go in the river to use rulers. We will also be using the tape measure, so that we can mark out at which intervals we will be measuring the depth at. Once we have determined the intervals we will use the ruler to measure the depth. The only problem with this being that we might not be always be measuring from the riverbed. ...read more.

Conclusion

I can now prove that as the river moves downstream the rocks become rounder and smoother. Which is what my theory states that should happen. I have decided to use this graph because of the fact that it is one constant line which doesnt break. This is easy to show how the average depth of the river changes from site 1 to site 11. This graph clearly shows us how the rivers depth changes from the shource to mouth, it gives us an idea of what is happening. If i was to compare site 1 with site 6, the result would be clear to see. The fact that at site 1 the depth is 0.22m, where is at site 6 the depth is 0.42m. This clearly shows us how the river depth does indeed change from source to mouth. The points which dont really fit my trend are site 7 and site 8. This is because these 2 sites were tributaries of the river breamish, so i cant really count these in my trend line. So in conclusion to my key question i can show how the rivers depth does indeed increase from source to mouth. Geographical enquiry on how a rivers characteristics change From source to mouth ...read more.

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