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Report On the Change In Sediment Size Along the Length and Breadth of Hurst Beach.

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Introduction

REPORT ON THE CHANGE IN SEDIMENT SIZE ALONG THE LENGTH AND BREADTH OF HURST BEACH IDENTIFICATION OF THE QUESTION Having spent a day collecting and collaborating data at Chesil Beach, Dorset we decided to make a comparison with Hurst Beach. Hurst Beach is a shingle, coastal deposit which has formed a spit on Hampshire's south coast (Fig. 2). This is much like Chesil Beach (Fig. 1), though on a smaller scale. Having examined Chesil Beach one factor that was observed was the change in the size of sediment laterally along the beach. Using our knowledge of longshore drift we decided to investigate two hypotheses concerning the sediments on Hurst Beach: 1) The size of sediment increases laterally along Hurst Beach 2) The size of sediment on Hurst Beach increases further from the sea DEVELOPMENT OF A STRATEGY In able to answer our hypotheses the sediments on the spit needed to be sampled. It would be both unnecessary and unreasonable to sample every stone, and so a sampling strategy was developed. ...read more.

Middle

The stones then needed to be measured. To achieve this one person measured all the stones using a rule with millimetre divisions whilst one person recorded the results. RESULTS B measurement mean for stones at lower sampling points: 11.36mm B measurement mean for stones at middle sampling points: 17.36mm B measurement mean for stones at top sampling points: 18.73mm When this data was input into the Spearman's rank correlation test the following results were produced. Lower Sample R= 0.452 Significance Level Critical Value Conclusion 0.05 0.523 Insignificant Correlation 0.025 0.623 Insignificant Correlation 0.01 0.736 Insignificant Correlation Middle Sample R= -0.243 Significance Level Critical Value Conclusion 0.05 0.523 Insignificant Correlation 0.025 0.623 Insignificant Correlation 0.01 0.736 Insignificant Correlation Top Sample R= 0.595 Significance Level Critical Value Conclusion 0.05 0.523 Significant Positive Correlation 0.025 0.623 Insignificant Correlation 0.01 0.736 Insignificant Correlation DATA ANALYSIS The bar charts all show varying results. The chart for the top of the beach shows bars that do increase along the beach with only one point, post 12, having a value lower than that of post 8. ...read more.

Conclusion

This shows that the size of sediment does indeed increase with distance from the sea. SUMMARY AND LIMITATIONS I do not feel that the results I have gained are sufficient to prove my first hypothesis as the graphs are inconclusive. The data from the top of the beach does show the sediment size to increase along the spit showing evidence of longshore drift. However, the middle and lower data do not show any firm evidence of this. I do on the other hand feel that I can conclude that the size of sediment does increase further from the sea on Hurst Beach. The data is sufficient to show this and there is geographical reason as larger stones will be pushed up the beach by either constructive waves with weak backwash or storm waves which hurl large sediments to the top of the beach. The main limitation to the investigation is the stones collected at each point may have been sorted in a non-random way so that when they were picked using a random number generator an unfair representation may have been selected. This could have been the cause for anomalous results. ...read more.

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