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Exploring controls on coastal dune growth through a simplified model

2023Journal article Open access
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dc.contributor.authorKombiadou, Katerina
dc.contributor.authorCostas, Susana
dc.contributor.authorRoelvink, Dano
dc.date.accessioned2023-11-07T15:58:39Z
dc.date.available2023-11-07T15:58:39Z
dc.date.issued2023
dc.description.abstractProcess-based morphodynamic models can be useful in understanding coastal dune responses to disturbances, as well as possible evolutionary patterns. To this aim, we employ Duna, a simplified 1D morphodynamic model, to assess the influence of dune morphology (height and slope) on sand transfer and deposition across the dune profile for different beach widths and wind incidence angles through idealized experiments. Simulations of real conditions show good model performance, both in wind flow reproduction and in topographic change along the dune profiles tested. The idealized experiments show that wind speed increases and sand accumulation decreases logarithmically with dune height and linearly with stoss slope along the dune profile. Fetch and cosine transport limiting parameters are reflected in the sand accumulated windwards from the toe, while sand transfer to the dune appears controlled by multiple factors; the higher the dune and/or the narrower the beach, the likelier that maximum accumulation occurs under oblique winds. Results point to two different types of evolution for high dunes. Either the vegetation is dense enough to maintain the stoss position, in which case vertical growth near-ceases and seaward progradation is promoted, or the stoss is eroded and landward retreat dominates, in which case sand transfer to the crest and lee continues as a mixture of low input from the beach and recycled sand from the stoss. Coastal dunes are sensitive ecosystems whose survival depends on their adaption to changing conditions. Thus, it is important to understand how dune characteristics (i.e., shape, vegetation type, and cover) and prevailing conditions (i.e., wind speed and direction, beach width) determine where and when sand is deposited onto the dune, promoting growth. This is the result of a complex balance between winds that bring sand to the dune from the adjacent beach (main sand provider), the dune topography (decelerating winds near the dune toe and accelerating them along the slope, up to the dune crest) and dune plants (slowing winds down in their vicinity and trapping wind-blown sand). The main controls on these complex interactions have been incorporated into the Duna model for aeolian sand transport. After tuning parameters and verifying that simulated results are accurate, Duna is used to assess the impacts of dune shape (height and slope), beach width, vegetation coverage and wind angles to wind flow and topographic changes on the dune. Results show that both wind speed and sand accumulation vary logarithmically with dune height and linearly with slope. The simulated sand distribution along the dune is used as a basis to draw generalized dune growth patterns. Duna morphodynamic model is calibrated and validated against Computational Fluid Dynamics model results and field dataThe influence of dune shape (height and slope), wind incidence, vegetation density and beach width on dune growth is investigatedDune height and plant cover are the main factors controlling accumulation patterns, sand recycling and vertical growthpt_PT
dc.description.sponsorshipALG-01-0145-FEDER-028949; CEECINST/00146/2018/CP1493/CT0011; LA/P/0069/2020pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1029/2023JF007080pt_PT
dc.identifier.issn2169-9003
dc.identifier.urihttp://hdl.handle.net/10400.1/20139
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAmerican Geophysical Unionpt_PT
dc.relationAligning Nature-based Solutions to coastal adaptation
dc.relationCentre for Marine and Environmental Research (CIMA)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectPrince-edward-islandpt_PT
dc.subjectAir-flowpt_PT
dc.subjectGreenwich dunespt_PT
dc.subjectWind flowpt_PT
dc.subjectForedunept_PT
dc.subjectTransportpt_PT
dc.subjectSandpt_PT
dc.subjectScalept_PT
dc.subjectBistabilitypt_PT
dc.subjectVegetationpt_PT
dc.titleExploring controls on coastal dune growth through a simplified modelpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAligning Nature-based Solutions to coastal adaptation
oaire.awardTitleCentre for Marine and Environmental Research (CIMA)
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FCTA-GFI%2F28949%2F2017/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/2022.05392.PTDC/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/CEEC IND4ed/2021.04286.CEECIND%2FCP1672%2FCT0001/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00350%2F2020/PT
oaire.citation.issue9pt_PT
oaire.citation.titleJournal of Geophysical Research: Earth Surfacept_PT
oaire.citation.volume128pt_PT
oaire.fundingStream9471 - RIDTI
oaire.fundingStream3599-PPCDT
oaire.fundingStreamCEEC IND4ed
oaire.fundingStream6817 - DCRRNI ID
person.familyNameKombiadou
person.familyNameCostas
person.givenNameKaterina
person.givenNameSusana
person.identifier1448818
person.identifier.ciencia-id1813-F159-070B
person.identifier.ciencia-idAF19-9EEE-7550
person.identifier.orcid0000-0003-1199-1236
person.identifier.orcid0000-0002-4005-077X
person.identifier.ridM-7458-2017
person.identifier.scopus-author-id16029005200
person.identifier.scopus-author-id9043656500
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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