Water exchange across the beach face for swash on coarse-grained beaches

Kate Steenhauer, Dubravka Pokrajac, Tom O'Donoghue, Gustaaf Kikkert

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

1 Citation (Scopus)


The effects of beach permeability on the swash hydrodynamics is at present still poorly understood. This has motivated a series of detailed free surface and subsurface flow measurements to be undertaken in a controlled large-scale laboratory environment using a Laser Induced Fluorescence (LIF) technique, pressure transducers and wetting front recordings for two immobile coarse-grained beaches. Experimental results show that air plays a significant role in the exchange between free surface and subsurface flows. A numerical model has been developed for swash on permeable beaches consisting of a I D free surface shock-capturing model, based on Shallow Water Equations, and a ID subsurface flow model. It captures the main features of swash and wetting front profiles. The combined insights from the experimental and numerical work will contribute to better understanding and modelling of swash and similar flows.

Original languageEnglish
Title of host publicationCoastal Engineering 2008 (in 5 volumes)
Subtitle of host publicationProceedings of the 31st International Conference
EditorsJane McKee Smith
Place of PublicationSingapore
Number of pages13
ISBN (Print)978-981-4277-36-5, 9814277363
Publication statusPublished - 22 Jul 2009


  • sediment transport
  • equations


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