Aqa Geography Coursework Rivers Text

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These are things that happen when precipitation falls on land, these can affect a river and how its volume can change because of rainfall on land. Water will fall to the ground as rainfall and will store as ice or go into lakes. Water will flow on the land surface runoff particularly if it's impermeable soil or rocks. Water will penetrate into the soil if it is permeable it will either get stored in rocks or will flow through the ground into the sea. This will then flow through underlying rocks in the soil, and continue its journey until it reaches the sea. These processes can reduce stream water volumes as a result it can reduce erosion rates as well.

We had to do this in the middle of the river, the left hand side and the right hand side also we did this for all 3 sites. Lhs m rhs measuring the velocity of the river this was done because it tells us how fast the flow of the river was at each site, to do this we used a cork in order to see how fast it flowed given a specific distance i.e. To measure the time taken for the cork to flow this distance we had to drop it about 20cm at the start of the 1 metre ruler on the water surface. We started the stopwatch as soon as the cork was just beside the 1 metre ruler at the beginning of it. Finally we stopped the watch when the cork had finished its distance of the 1 metre ruler, we repeated it three times each, for each site. Stopwatch cork 1m ruler measuring the river gradient at each site we found out the angle at which the flowed downstream by finding out the river channel gradient. To measure the gradient we had to have two people hold the ranging poles opposite each other in a vertical position.

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While you are doing this place the clinometer beside the alternating colours on the ranging poles and look through the clinometer to your partner's pole. Clinometer distance around 2 3 meters measuring the pebble size this was used to find out if the pebbles were being damaged as we went downstream due to attrition. We had to measure the long axis of the pebble to see if this was true to measure the length of the pebble we measured from one edge of the long side to the opposite side giving us an accurate length. Pebble measured using 15cm ruler equipment list tape measure 1m ruler 30 cm ruler stopwatch cork pot ranging poles 2 . Transportation by traction causes attrition, whilst saltation further decreased pebble sizes. Conclusion water width and depth increase downstream more erosion through increased water volumes.

Clinometer may move when finding out the gradient because it is difficult to make the ranging poles stay in one position and so it may have moved when measuring the gradients cannot take exact measurement of pebble as the surface is curved, so the results are not entirely accurate. Improvements: collecting 2/3 of each water width and depth measurement, rather than 1, would have removed anomalies, ensured accurate results. Velocity results could have been performed over longer distances to guarantee more accuracy.

Using a tripod and clinometer would have removed problems with instability of hand in measuring gradients of each site. Conclusions could be wrong in that loughton brook is small, therefore changes in rivers features are less apparent, the cause of slightly inaccurate results. Experiments were performed well overall, excluding pebble long axis measurements.

The above preview is unformatted text intro aims to investigate what patterns the river allt doire nan eun shows for wet water depth, water velocity and ph in its three courses. To investigate whether the river shows textbook characteristics for erosion and deposition in a river channel. To investigate how rock roundness and moss coverage changes downstream and at different points across a channel. Location during the course of this geography field trip my group set out to investigate the aims stated above. Once there we stayed at the kindrogan field centre in enochdhu, blairgowrie, perthshire near pitlochry. Why was this site chosen? we studied the river allt doire nan eun firstly because of the fact that each of its three courses were fairly close to each other due to the relative shortness meaning that we could travel from one to the next quickly and therefore collect results from each of the three sites upper, middle and lower course within a day . This experiment shows that the steeper it is, the higher the water velocity should be.

The stopwatch was started and the hydroprop was placed into the water facing upstream. If it was taken facing downstream on a different occasion, the flow would have been twisting it in a different direction which may have caused the results to be less reliable. Flow speed this was measured using an orange, tape measure stretched taut at 5m and a stopwatch.