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Find out in which ways a river changes from its source to its mouth.

Extracts from this document...

Introduction

Rivers Coursework Contents Introduction Rivers Coursework Main Aim: To find out in which ways a river changes from its source to its mouth. We traveled to the west coast of Wales to find out how a river changes from its source to its mouth. We were situated in the small rural village of Tal-y-bont, which was near the town of Aberystwyth. The river that we decided to test out with our hypothesis and find out our aim on was the river Einion. The river Einion is a tributary to the river Dovey. The river is roughly 4 miles long and 12 miles from Aberystwyth. Aberystwyth is mainly a tourist-based town, situated between three vast hills, equipped with many facilities for tourists but it is also renowned for its Castle ruins and stony beaches and also a large spit at Cardigan Bay. Aberystwyth is the home for the University of Wales and the National Library of Wales. The landscape of Aberystwyth is very hilly, with many interlocking spurs and V shaped valleys in the area. In order to test and prove our hypothesis, we conducted tests on the river Einion at five different points along the river to show us the changes it has made from its source to its mouth. This is where the river Einion is situated on a map of Wales River Dovey Aberystwyth River Einion Site 5 Site 4 Site 3 Site 2 Site 1 These are the five sites that we collected data from and proved our hypothesis at. Hypothesis * As the depth of the river increases from source to mouth, the sediment size will decrease. ...read more.

Middle

Where the water met the ruler the measurement was taken and recorded. To make sure that the reading was accurate, two people from the group viewed the reading and agreed on the measurement. The rule was twisted so that it ran parallel with the river; making it more streamlined which made the measurement easy to take. The people taking the reading were downstream from the rule so they did not interrupt the flow of water. The bottom of the meter rule, marked 0, was placed at the riverbed. Once again boulders became an inconvenience towards the top of the river, because they were larger, so we moved them out of the way and placed the rule against the shingle below. We repeated this for the seven points across the river and at the four other sites. The depth was taken to 1 decimal place. Sediment Size This is the size of the deposits in the river such as boulders and rocks. Finding the sediment sizes allows me to continue with the hypothesis that: As the depth of the river increases from source to mouth, the sediment size will decrease. To find the results, the river was split into the same 7 points as when finding the depth. From each of these points we took 3 rocks from the riverbed. We measured the longest side and then threw them over the bank so that we would not be able to pick that rock up again by mistake. The person picking up the rocks, tended to pick up the bigger rocks as they could only feel the rocks that were coming out of the water, not see them. ...read more.

Conclusion

Where we measured to the edge of the bank, maybe we should have measured to the point where the water comes into contact with the bank. Also, we may have not been measuring straight across the river and had the tape at an angle, this would of given us extra distance that may of affected our results. From looking at secondary sources, the width of the river should definitely of got bigger as we reached the mouth. * As the velocity increases, the gradient will decrease. This was not conducted very well in accordance to our results or the river didn't give us the results we were looking for. From my graph, I can see that the velocity started to increase overall from site 1 to site 2. However this pattern did not continue as site 3 turned out to have the lowest velocity of all 5 sites. Site 4 was fairly high and then site 5 became very low. The strange results may have been because the sites were not equally spaced out or that the area in which the equipment was used was deep or shallow. The gradient was slightly more successful, with sites 1,3 and 5 following a pattern and with sites 2 and 4 becoming anomalies. I put these down to the fact that we did not go deep enough into the riverbed; instead we stayed towards the surface of a layer of shingle. We should have maybe gone deeper. Or maybe it was down to the person who was taking the readings, as on the equipment they used, there were several marks from where to record the data from. Maybe this was the case. Russell Ainsworth Rivers Coursework ...read more.

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