Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 22, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL100098
Keywords
coastal barriers; overwash; washover; coastal development; built environment; physical experiment
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Funding
- Leverhulme Trust [RPG-2018-282]
- Early-Career Research Fellowship from the Gulf Research Program of the National Academies of Sciences, Engineering, and Medicine
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The passage discusses the significance of overwash and washover deposits in sediment budgets for coastal barrier systems, and proposes a method for inferring volume from planform measurements using scaling relationships. It also highlights the importance of gaining three-dimensional insight into washover deposits from two-dimensional information.
Overwash is the cross-shore transport of water and sediment from a waterbody over the crest of a sand or gravel barrier beach, and washover is the resulting sedimentary deposit. Washover volume, and alongshore patterns of washover distribution, are fundamental components of sediment budgets for low-lying coastal barrier systems. Accurate sediment budgets are essential to forecasting barrier system sustainability under future climate-driven forcing. However, comprehensive surveys of three-dimensional washover morphology are challenging to deliver. Here, we use the results of a physical experiment, analysis of lidar data, and examples of washover characteristics reported in the literature to develop scaling relationships for washover morphometry that demonstrate volume can be reasonably inferred from planform measurements, for washover in natural (non-built) and built barrier settings. Gaining three-dimensional insight into washover deposits from two-dimensional information unlocks the ability to analyze past aerial imagery and estimate contributions from washover flux to sediment budgets for past storms.
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