The title for my investigation is: “To what extent is the rate of erosion equally distributed at Durdle Door and Lulworth Cove?” This is the predominate question and it has been split up into 3 different sub questions each needed to target specific questions of the main question, therefore this ensures the main question is more accurately answered. The 3 sub questions are; “To what extent do wave characteristics contribute to distribution of erosion at Durdle Door and Lulworth Cove?”, “To what extent do geological features such as faults and bedding planes (lithology) contribute to erosion at Lulworth Cove and Durdle Door?” and “How and why does beach profile vary between Durdle Door and Lulworth Cove?”.
The destination selected for the investigation was the Coast of Dorset which was an area that had enough variation of landforms that would enable me to construct and gather primary data to help me gain evidence to fabricate a conclusion. Some areas were easily accessible and relatively safe. The primary data collected includes wave type, beach profile, longshore drift and sediment size. Secondary data collected includes weather forecasts and wind speed for that day will be obtained from the internet website such as “weather.com”. Overall, a vast quantity of different data was gathered to ensure enough data was available to accurately show contrast between the two investigation points, and to also ensure the main investigation question if fully answered to the best of my ability.
The destinations needed for me investigation was Lulworth Cove which was near the village of West Lulworth on the Jurassic Coast World Heritage Site in Dorset, southern England and Durdle Door which is a natural limestone arch also on the Jurassic Coast. The maps under “location of study” show accurately the area under investigation.
The primary data was collected from the two sites on the same day however at different times and the results were noted on a data collected sheets so they were easily understood when forming a conclusion. The sampling techniques used were random sampling and pragmatic. Random sampling involved picking 5 different rocks at each ranging pole to obtain information for sediment size. This technique avoids any potential bias that could cause unreliable results, such as picking the largest and smoothest rock you can find. Therefore this technique is effective when implemented correctly. The sampling was also pragmatic as we had to avoid dangerous situations such as not going too close to the cliff face, and had to distinguish which areas were accessible as there was a high density of people at the investigation point at certain times.
Durdle Door landscape:
Lulworth Cove Landscape:?
Advantages and Disadvantages of data presenting strategies
The majority of the data presented in my investigation was primary data and they have been displayed using numerous graphical and presenting techniques. These include; bar graph (to sites in one), table of columns and rows, line graphs (2 lines) and annotated pictures of the two sites that my investigation depends upon, Durdle Door and Lulworth Cove.
Each technique contains its various advantages and disadvantages, some of which are listed below:
Bar graph: Used to show the average sediment size at increasing distance from the sea.
? Exact Figures are reasonably easy to read off.
? Construction is easy.
? Comparison of sediment size at the different sites is easy.
? Significant differences can be easily identified.
? Easily understood due to its common usage in businesses and media etc.
? Additional/ information needed to show exact reasons for variation in sediment size at each site.
Line graph: Used to show to cumulative height change on beach profile at increasing distance. The two lines show a variation between Lulworth Cove and Durdle Door.
? Very effective method to portray quantitative and continuous data in likes of beach profile.
? Tends and patterns can be identified easily.
? The two lines allow multiple sets of data to be analysed.
? Construction such as plotting points is time consuming.
? Theoretical value may be plotted as exact values may be difficult to deduce due to scale size.
Annotated photographs: Used to show the different investigation points, Lulworth Cove and Durdle Door. Information such as characteristics of both sites were annotated which could help determine which coastline erodes at a greater rate.
? Excellent visual representation of each site.
? More accurate than field sketches.
? They can support collected data.
? Secondary data photographs are not always reliable and accurate.
? The more attractive areas are annotated whereas unattractive areas are left out and they are just as important.
Table/list: Used to show comparison between the two types of data collected. For example wave count at both investigation points.
? Very easy to understand.
? Easily to compare information across rows or columns.
? Not effective when finding/ determining trends or correlations.