aPPLIED FIELD WORK
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random data
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stratified data
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systematic data
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transect
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Random data is data that each result doesn't have a set corelization to one another. It is taken from absolute random measurements or numbers. For example if there was 100 people of all age groups each with there own number 1-100 and you could only ask 5 for their opinions; random data could select numbers 33, 41, 4, 53 and 91.
Stratified data is data taken from groups. This could mean taking your measurements once halfway in between each groyne. For example if there was 100 people of all age groups each with there own number 1-100 and you could only ask 5 for their opinions; stratified data could select 1 number from each age group.
Systematic data is data taken from fixed periodic intervals. This could mean when measuring the size of stones you measure therm every 3 meters until the end. For example if there was 100 people of all age groups each with there own number 1-100 and you could only ask 5 for their opinions; systematic data could take numbers 20, 40, 60, 80 and 100.
A transect is a line following a route along which data is collected. You can collect data like gradient of the beach along a transect, by collecting the gradient every 3m for example.
how we collected our results:
When we went to High Cliffs we collected various results on the coast. This included pebble size and class going up the beach and the angle increase up the beach.
Hypothesis: That long shore drift will be from west to east.
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Rock sizing:
At a random area in between two groynes we placed a tape measure from the sea up to the path so the tape measure was perpendicular to the coast. Then every 3 meters (so it is systematic data) we put the quadrat down and picked a pebble from the top, middle and bottom. With each stone we used the calipers to measure the height, width and depth and then recorded it down. Using the calipers is reliable since we are using it with every stone, but not very accurate since it was recorded in centimeters. Beach angle: Once the tape measure was already set up we set up rulers every 3m meters and put the gunclinometer on it and measured the angle to the next and put the result down. (as seen in slideshow.) (Results below.) |
Rock class:
Some of us who were working well on the investigation were given an extension task to decide which class the pebbles on the beach were put into. I decided they were class 4/5, but there are many problems with this. Firstly it is based on our opinion meaning it could be wrong or one of us could have a different opinion to another. Another reason is we could pick up an anomaly meaning that particular pebble could be more or less eroded than others. As we went up the beach we learnt that the pebbles away from the sea were more angular than the ones closer, though none were very angular. This shows that the pebbles that were being hit by the waves are being eroded more.
Some of us who were working well on the investigation were given an extension task to decide which class the pebbles on the beach were put into. I decided they were class 4/5, but there are many problems with this. Firstly it is based on our opinion meaning it could be wrong or one of us could have a different opinion to another. Another reason is we could pick up an anomaly meaning that particular pebble could be more or less eroded than others. As we went up the beach we learnt that the pebbles away from the sea were more angular than the ones closer, though none were very angular. This shows that the pebbles that were being hit by the waves are being eroded more.
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Group five: width 30m, height 4.5m
Group four: width 30m, height 3m Group three: width 21m, height 5.5m Group two: width 54m, height 7m Group one: width 33m, height 4.5m There is no relation between these results and the height and length doesn't decrease along the coast. If you ignored the results of group one there is a gradual decrease along the coast, but group one cannot be ignored as is still reliable data and there is no reason it could be wrong. |
In conclusion: In conclusion we could not prove our hypothesis from the data we collected. We predicted that long shore drift will go from west to east and this would be true if sand was deposited more to the east and gradually less towards the west. But our results give no indication of this.