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Beach Management Plans
3rd Sep 2014Posted in: Beach Management Plans Comments Off on Wave and Water level conditions
Wave and Water level conditions

The aim of this task was to generate a homogenous data set of the Joint Return Probability (JRP) of waves and water levels around the southeast coast of England, to provide input for beach design, in particular run‐up elevations on mixed beaches. This work is part of the Southeast Coast Beach Management Plan project to provide a transparent, repeatable and updateable evidence base to inform beach management at a regional scale.

Originally, the intention was to use the ~10‐year record of wave data measured by nearshore wave buoys. However, as the project progressed, the emphasis changed to using the 33‐year (1980 to 2012) Met Office WaveWatch III hindcast for the all the points shown below as the main data source.

Exceedance (an example is shown below) and extremes were calculated using SANDS and a range of comparisons between different sample intervals and coastal monitoring wave buoys in close proximity were made to ensure that the wave data set used was the most appropriate.

Exceedance

The wave extremes were then combined with the closest point from the 2011 Coastal Flood boundary condition study using the desktop methodology from Hawkes, P.J., 2005. Use of Joint Probability Methods in Flood Management: A Guide to Best Practice (Technical Report FD2308/TR2). Defra Flood Management Division, London.

The results are JRP tables and curves for all waves and split by directional sector (see example below) for each of the Met Office points shown above. These also highlight where the extrapolation of extremes approach depth limited conditions.

Potential Depth Limitations

 

For more information about the report please contact uwe.dornbusch@environment-agency.gov.uk

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