Abstract
Mixed grain beaches include sediment sizes ranging over three orders of magnitude from fine sand (100mm), through gravels (2mm – 64mm) right up to small boulders (>256mm) (Coates & Damgaard, 1999). This type of beach is frequent around the world, including the Mediterranean. Sediment distributions may vary across the beach profile, along the shore and with depth below the beach face, as well as with time. Depending on these distributions, the beach response to wave conditions will vary.
Re-nourishment schemes using materials that are significantly different to the indigenous ones in terms of size and distribution have also produced mixed beaches all over the world. Nourishment schemes are often used in preference to hard defences, particularly in areas that are valued for their coastal recreation.
While the transport processes involved in the creation of sand beaches are being extensively researched throughout the coastal engineering community, little international effort is directed to gravel beaches and even less to mixed sediments beaches. Understanding and confidently predicting the behaviour of all types of beaches under different conditions and time periods is important to beach management and coastal defence.
This paper discusses the most characteristic mixed beach processes and then describes ongoing research at HR Wallingford on predicting beach responses, including a discussion of the ANEMONE suite of models.
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De San Román-Blanc, B.L., Damgaard, J.S., Coates, T.T., Holmes, P. (2003). Management of Mixed Sediment Beaches. In: Goudas, C., Katsiaris, G., May, V., Karambas, T. (eds) Soft Shore Protection. Coastal Systems and Continental Margins, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0135-9_21
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DOI: https://doi.org/10.1007/978-94-010-0135-9_21
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