Sediment modelling for Poole and Christchurch Bay

Knaapen, M. (2019) Sediment modelling for Poole and Christchurch Bay. In: TELEMAC-MASCARET User Conference 2019, 15-17 October 2019, Toulouse, France.

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Abstract

Poole and Christchurch Bays have narrow beaches which attract many visitors to the area and are therefore essential for the local economy. However, the beaches suffer from ongoing erosion, making regular beach nourishments to maintain them necessary. Sea level rise may cause an increase in the required frequency of these nourishments. If one can determine where the sediment sinks are, i.e. the location where the eroded beach material ends up, it may be possible to recycle the material, by dredging in the area of the sediment sinks and returning this material to the area of the beach. For this purpose, a numerical model is developed that computes the sediment transport pathways in the area between Swanage and the Isle of Wight. This model will be the basis for future projects to determine the changes due to the proposed works, either in large scale engineering or beach nourishments. The model has been calibrated and validated against measurements taken at 9 locations using AWAC systems. The model fits well with the observations and even reproduces most of the observed sediment transport. The model works well as a tool to analyse the sediment transport pathways and assess where material eroded from the beaches is likely to end up. The model run of a whole year shows a clear pathway of sand along the beaches towards the east and back further offshore, south of Dolphin Bank and Dolphin Sands. Only part of the sand leaves the bay and is moved east along the Isle of Wight. The erosion deposition depends strongly on the coarser fractions in the bed composition in the model, but the results are promising for impact assessments of engineering works.

Item Type: Conference or Workshop Item (Paper)
Additional Information: XXVIth TELEMAC-MASCARET User Conference
Subjects: Coasts > Sediment transport and scour
Divisions: Coastal
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:54
Last Modified: 28 May 2020 09:27
URI: http://eprints.hrwallingford.com/id/eprint/1368

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