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A numerical model of coastal overwash
SMHI, Research Department, Hydrology.ORCID iD: 0000-0002-0086-4453
2009 (English)In: Proceedings of the Institution of Civil Engineers: Maritime Engineering, ISSN 1741-7597, E-ISSN 1751-7737, Vol. 162, no 3, 105-114 p.Article in journal (Refereed) Published
Abstract [en]

Overwash, the flow of water and sediment over the crest of a beach, contributes to flooding and the deposition of sand landward of the beach crest. Washover, the sand deposited by overwash, contributes to the sediment budget and migration of barrier islands. The ability to predict the occurrence, location, and thickness of overwash deposits is important for coastal residents, coastal town planners, environmental planners, and engineers alike. In this study, a numerical model that simulates the sediment transport and one-dimensional barrier profile change caused by overwash was developed. The magnitude of overwash and the morphology of washovers are dependent on the overwash regime. New formulae are developed to estimate the sediment transport rate over the beach crest for both run-up overwash, using ballistics theory, and inundation overwash, treating flow over the crest as weir flow. Two-dimensional flow is described on the back barrier by considering the continuity of a block of water at steady state, taking into account lateral spreading, friction, and infiltration. The model is tested against 26 different beach profile sets from several different locations, and several different storms, exhibiting a variety of initial morphologies. The model is capable of reproducing varying overwash morphology responses including dune crest erosion, dune destruction, barrier rollback, the thinning of a washover deposit on the backbarrier, and overwash over a multiple dune system.

Place, publisher, year, edition, pages
2009. Vol. 162, no 3, 105-114 p.
Keyword [en]
coastal engineering, hydraulics & hydrodynamics
National Category
Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:smhi:diva-608DOI: 10.1680/maen.2009.162.3.105ISI: 000272396400003OAI: oai:DiVA.org:smhi-608DiVA: diva2:807986
Available from: 2015-04-27 Created: 2015-04-21 Last updated: 2016-05-23Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • fi-FI
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