guide to chapter 6 evaluation in this section you need to describe how the enquiry process can be improved by questioning how the reliability of the methods used to collect the data have affected the accuracy of the results and validity of the conclusion. Increase the accuracy of results i have to write an evaluation for my geography coursework which is about the river alyn in wales. Show more i have to write an evaluation for my geography coursework which is about the river alyn in wales. I have been given five things that i have to write about which is the improvements that i could have done to the method, results and conclusion question the reliability of the methods, results and conclusion question the accuracy of the method, results and conclusion question the validity of the method, results and conclusion haven 039 t a clue what this is.

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Links components oh yeah, the methods that i carried out where the velocity, the discharge and the rock size. We measured the depth of the river at every 1/2 metre and picked up a rock at the same time and decided on what type of rock it was and measured the hight, width and length of the rock. For the velocity of the river we measured ten metres down the river and timed how long it took for an orange to travel ten metres and then did some equation to work out the speed. Introduction this is the evaluation section of the coursework folder on the geographical investigation conducted around the river calder, garstang based on the following hypothesis 'does the river calder fit the bradshaw model.' the bradshaw model is in figure 1. 5 catterall playing fields approximately 14.3km form source, grid reference 494 433.

These are the factors which were measured and are going to be evaluated: channel width channel depth water velocity discharge gradient average bed load size bed load roundness. Refer to the 'methodology' section of the coursework folder for information about the methods used to measure each of these attributes. 1 channel width: why the method used was good: the only skill required is a tight grip on the tape method is pretty straightforward to follow. If one possibly came back at another time of the year where rainfall was more balanced ex. Winter to compare the upper course and lower course attributes, then the river may fit the bradshaw model more accurately. The chart in the data presentation shows how initially, because of the storm, velocity was high, and, gradually, from site 3 onwards, increased fitting the bradshaw model.

4 gradient: why method used was good: used a hand held clinometre a simple method which is accurate if used correctly i.e. I could go back to river calder for a more comprehensive study using smaller stretches along the course to increase precision, as the poles will be closer thus clinometers gun's angle is more concentrated . Thus it was simplified to 3 categories: 'angular', 'sub angular' and 'rounded', in spite of simplification, subjectivity was still dominant it was hard to agree between a category i.e. It was ambiguous whether a rock was really sub angular or angular, and which category it would best fit into. Group members presumed that because, for example, a rock was in the upper course that it would always be angular and vice versa.

100 stones is a small sample out of such a large population, especially in site 5, where the there were more rocks. This decreases accuracy of global results because one group's opinion on a rock's roundness differs to another group's opinion on the same rock. If i was to measure all of the rocks' roundness at each site, on my own, the results will be more pertinent because subjectivity would not be a down factor as everything will be through one perspective only. However if my opinion was wrong then all the results would be wrong, making the investigation worthless. Riyadh abdulla evaluation instructor: mr walker gcse geography spec.b candidate number: 4185 page 1. Introduction evaluations my first hypothesis stated that velocity of the river increases downstream.

This was measured by timing how long it took for an orange to travel 10 metres downstream. Firstly, the orange used was quite heavy, and when in the water, most of it was submerged, therefore it moved more slowly. In many places there were twigs, leaves and weeds in the river, thus blocking the oranges path and slowing it down. I tried to make sure that the orange was put in the water ahead of the ten metre measuring distance so it had chance to reach its velocity before measuring began. However there were inconsistencies at each site, and sometimes access to the water was limited and this could not happen.

Different people were used on the stop watch everyone has different reactions and would have stopped the watch according to their judgement about when the orange had crossed the 10 metre line. Although i stated that we would do the measuring in a straight section of the river, this was not always possible, because some sites made access to the river difficult. This would have ensured that the sites i had chosen typified that stretch of river. The third hypothesis which i measured stated that the bedload of a river gets smaller and smoother downstream. To measure the size of the bedload, callipers were used to measure the length, width and height of the pebbles. For this hypothesis i believe that my methods were very good, and not much could be done to improve them. Callipers are a good way to measure pebbles, they are easy to use, and far more accurate than a ruler.

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One can accidentally put other items from the river into the beaker with the pebble by accident. The beaker is not very precise, it does not measure to a great deal of detail, and more than one small pebble can accidentally be placed in the beaker. Therefore, the conclusions i have drawn from my studies are not valid on all rivers, it is not possible to automatically assume that the results for the tests will be the same on a much larger river, such as the nile or the amazon. Any tributaries flowing into the river bourne would have a profound affect on our results, as the river does not carry much water. The drainage basin of this river is a lot smaller, so hardly any water is 'caught' compared to a larger river.

It is important to note that you can not assume that the conclusions will be the same. Also, as i did not do a pilot study, and only measured the river once in the summer, my results and conclusions could be affected. I went during the summer, where the river would be smaller than normal, as processes such as evaporation would have affected the volume of water in the river.