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Numerical study on the influence of infiltration on swash hydrodynamics and sediment transport in the swash zone

Hammeken, AM; Simons, RR; (2017) Numerical study on the influence of infiltration on swash hydrodynamics and sediment transport in the swash zone. In: Lynett, PJ, (ed.) Proceedings of 35th Conference on Coastal Engineering, Antalya, Turkey, 2016. ICCE Proceedings, Coastal Engineering Research Council: Antalya, Turkey. Green open access

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Abstract

Infiltration and exfiltration processes have a significant influence on the hydrodynamics of the swash zone. Such processes need to be taken into account in the modelling of cross-shore sediment transport and the prediction of beach profile evolution. This paper presents a numerical study of the swash hydrodynamics using a 2D Volume-Averaged Reynolds-Averaged Navier-Stokes model, which was calibrated and validated against new experimental data. The model was used to simulate wave run-up from regular waves over permeable and impermeable fixed slopes. Swash flow velocities and water depth data were obtained from the simulations and used to estimate bed shear stresses at three different locations on the beach slope. The results show that infiltration can have opposing effects on the bed shear stress when compared to equivalent swash on an impermeable slope. During the uprush phase, stresses are directly increased due to boundary layer thinning, whereas, during the backwash phase, there is a significant reduction of flow leading to a decrease in the bed shear stresses.

Type: Proceedings paper
Title: Numerical study on the influence of infiltration on swash hydrodynamics and sediment transport in the swash zone
Event: 35th International Conference on Coastal Engineering
Location: Antalya, Turkey
Dates: 17 November 2016 - 20 November 2016
ISBN-13: 978-0-9896611-3-3
Open access status: An open access version is available from UCL Discovery
Publisher version: https://journals.tdl.org/icce/index.php/icce/artic...
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: swash, infiltration, sediment transport, hydraulic conductivity, bed shear stress
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1557337
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