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Chesil Beach Investigation

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Introduction

Chesil Beach Investigation Hypothesis 1. The size of the pebbles will get BIGGER as you move to the LANDWARD side of Chesil Beach. Hypothesis 2. The slope angle will INCREASE as you move to the LANDWARD side. Hypothesis 3. The pebble size at the western end of Chesil Beach (Abbotsbury) will be BIGGER than the eastern end (Fortuneswell). Our aim when we got to Chesil Beach was to: - 1. Look for a change in the size of the pebbles along our transect and, 2. To look for a change in the slope angle along our transect. To achieve these aims we inserted two ranging rods, five metres apart from each other with the tape measure, along our transect (making sure that the top of the aluminium spike, where it meets the rod, was at ground level). We decided to put them 5 metres a part, as going to Chesil Beach before to carry out an initial inspection; from this initial inspection we also decided that we should measure the pebble size every metre. We then aligned the gun clinometer, which is a device used to measure slope angles, with the bottom of the top marker on the foresight rod. ...read more.

Middle

After this initial inspection we concluded that we should measure the slope angle every 5 metres. The reasoning behind this is that if we measured every 1 or 1/2 a metre it would be difficult to detect variations, as the slope angle does not change that much over 1/2 a metre; furthermore it would be too arduous and time consuming. The point of this exercise was to generate a general outline of the slope profile, not an impeccable interpretation of the beach profile. Also if we surveyed the slope angle every 50 metres we would fail to notice the subtle variations in the slope profile and as Chesil Beach is only approximately 100 metres wide we would produce a triangular shape for our profile. Along with the above if we measured to this degree we would increase the margin of error as in more instance the summit of Chesil Beach may obscure the backsight from the line of sight, preventing us from measuring accurately. We concluded, in addition to the above, that we should measure the pebble size every 1 metre, because if we measured every 5 metres insufficient quantities of data will be collected, impeding us from acquiring a credible average. ...read more.

Conclusion

But as with any data gathering process there will always be disadvantages; this process lacks structure, if you were using systematic sampling you could explain how and when and why you are going to measure, but with random sampling all you can see is that you will pick and measure the pebbles in any order. This is dangerous as it may put across the sense that your work is disorganised and that you have not put any thought into your data collection. Furthermore it is harder to plot data using random sampling because if you used systematic sampling you could say that you will measure the pebbles every metre and this means that when you plot a graph/chart your axis will have regular intervals. But if you use random sampling the axis could go like this 0.3, 2.76, 50.65. Some people argue that random sampling is time consuming, others say it's not. It could be seen as time consuming as you will have to measure where you are selecting your pebbles every single time you select them, and this measurement will not always be a round number. But it could also be seen as quicker compared to other ways as you can pick the pebbles from anywhere and not bother about measuring every metre or so. ...read more.

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