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Geography Project

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by

Finn C

on 4 January 2018

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Transcript of Geography Project

Westward Ho!
Westward Ho!
Westwards Ho! is a small resort town on the North of Devon's Atlantic Coast. Westward Ho! has a 2 mile long beach protected by a large pebble ridge. The ridge was formed by a large amount of erosion on the Hartland Point cliffs. The rocks were slowly transported down the coast to eventually form the famous pebble ridge. The ridge now acts as a natural sea defense protecting the area around it during Devon's harsh storms. Close to the town there are rock pools and a sea water swimming pool. The town is a very well known tourist attraction due to its Victorian history and the pebble ridge.
OS Map Extract showing the location of the data collection sites
Cross Sections
The cross section graphs show that as the ridge moves away from Westward Ho! its width to the ridge and the height of the ridge both decrease. The difference between Site 1 and Site 3 shows that the depth of the ridge decreases from 25.34m to 21.12m and that the height of ridge fell from 8.73m to 4.49m.
This information clearly proves my hypotheses.




Aims
My aim is to investigate the effects of longshore drift on the shape of the Pebble Ridge. We will do this by measuring its height and width, as well as looking at the size of the pebbles that make up the ridge.
Hypotheses
1. I think the depth and width of the pebble ridge will be greater at the Westward Ho! end of the ridge than it is at the Estuary end.

2. I think that I will find that the size of the pebbles will get smaller at the sites nearer to the Estuary.

Site 1
Site 2
Site 3
Method

Ranging poles were placed at right angles to each other. One at the base of the pebble ridge and the other at the highest point. A tape measure was stretched from one pole to the other, the key was to keep the tape measure as tight as possible for accurate readings. The poles at tape measures were held by a two people from the group to help with this. The red and white stripes on the ranging poles were used to make sure that the tape was at a constant height to the ground.

To measure the angle of the slope we used a clinometer. We used the angle of the tape measure to accurately allow us to measure it.

At each interval we measured the depth to the pebble ridge. This was the distance from the taught tape to the ridge. This was measured using a meter ruler.

At each interval along the tape measure we picked up a pebble and measured it along its longest axis. To do this we used a pair of callipers and recorded the length to the nearest one significant figure. (e.g 4.5cm)

Explanation of results.
swash
backwash
prevailing wind
Direction of longshore drift
This proves my original hypothesis that the pebble size will decrease as you move away from Westward Ho! because of the erosion taking place.
.
Tables of Data

Analysis of data:
The diagram shows that the largest pebble sizes found at these sites were 19cm at site one, 15cm at site 2 and 13cm at site 3.
The diagram also shows that the smallest pebble sizes found at these sites were 5.7 at site 1, 6 at site 2 and 7 at site 3.
This proves my original hypothesis that the pebble size will decrease as you move away from Westward Ho! because of the erosion taking place.
Site 3
Site 2
Site 1
Analysis of Cross Sections
Conclusion

During this investigation I discovered that the size of the pebble size got smaller as the ridge moved away from Westward Ho! towards the estuary. I also found out that the ridge decreased in both height and depth. These proved all of my original hypotheses to be correct.

What problems did I face when collecting the data?
• Windy and hard to keep the tape taught.
• The ranging poles had to be held at all time to keep them up.
• Hard to measure the angle due to the windy conditions

What would I do differently next time?
•Use ranging poles that are able to stay up.
• Taken more intervals – possible 20 – this would make our readings more accurate.
• Measure both sides of the ridge.
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