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dc.contributor.authorHenderson, Stephen M.en_NZ
dc.contributor.authorNorris, Benjaminen_NZ
dc.contributor.authorMullarney, Julia C.en_NZ
dc.contributor.authorBryan, Karin R.en_NZ
dc.date.accessioned2018-07-04T22:28:41Z
dc.date.available2017-09-01en_NZ
dc.date.available2018-07-04T22:28:41Z
dc.date.issued2017en_NZ
dc.identifier.citationHenderson, S. M., Norris, B. K., Mullarney, J. C., & Bryan, K. R. (2017). Wave-frequency flows within a near-bed vegetation canopy. Continental Shelf Research, 147, 91–101. https://doi.org/10.1016/j.csr.2017.06.003en
dc.identifier.issn0278-4343en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11916
dc.description.abstractWe study water flows and wave dissipation within near-bed pneumatophore canopies at the wave-exposed fringe of a mangrove forest on Cù Lao Dung Island, in the Mekong Delta. To evaluate canopy drag, the three-dimensional geometry of pneumatophore stems growing upward from the buried lateral roots of Sonneratia caseolaris mangroves was reconstructed from photogrammetric surveys. In cases where hydrodynamic measurements were obtained, up to 84 stems per square meter were observed, with stem heights < 0.6 m, and basal diameters 0.01–0.02 m. The parameter α =(frontal area of pneumatophores blocking the flow)/(canopy volume) ranged from zero to 1.8m−¹. Within-canopy water velocity displayed a phase lead and slight attenuation relative to above-canopy flows. The phase lead was frequency-dependent, ranging from 0 to 30 degrees at the frequencies of energetic waves ( >0.1 Hz), and up to 90 degrees at lower frequencies. A model is developed for wave-induced flows within the vertically variable canopy. Scaling suggests that acceleration-induced forces and vertical mixing were negligible at wave frequencies. Consistent with theory, drag-induced vertical variability in velocity scaled with ꓥ = Tw/(2πTf) , where Tw=wave period, Tf=2/(CD₍ₐ|ᵤ|₎) is the frictional time scale, CD≈2 is the drag coefficient, and |ᵤ| is a typical flow speed. For fixed wave conditions ( |ᵤ| and Tw), theory predicts increasing dissipation with increasing vegetation density (i.e. increasing a), until a maximum is reached for order-one Λ. For larger Λ, within-canopy flow is so inhibited by drag that further increases in a reduce within-canopy dissipation. For observed cases, Λ≤0.38 at energetic wave frequencies, so wave dissipation near the forest edge is expected to increase with increasing pneumatophore canopy density. However, under different wave conditions, the most dense canopies may occasionally approach the dissipation maximum (Λ≈1). Predicted dissipation by the pneumatophore canopy was sufficient to attenuate most wave energy over distances slightly less (more) than 100 m into the marsh in 1 m (2 m) water depth.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherElsevier Ltd.en_NZ
dc.rightsThis is an author’s accepted version of an article published in the journal: Continental Shelf Research. © Elsevier Ltd.
dc.subjectScience & Technologyen_NZ
dc.subjectPhysical Sciencesen_NZ
dc.subjectOceanographyen_NZ
dc.subjectWave dissipationen_NZ
dc.subjectDrag coefficienten_NZ
dc.subjectMangroveen_NZ
dc.subjectPhotogrammetryen_NZ
dc.subjectEstuariesen_NZ
dc.subjectVegetationen_NZ
dc.subjectMANGROVE FORESTSen_NZ
dc.subjectENERGY-DISSIPATIONen_NZ
dc.subjectMEKONG DELTAen_NZ
dc.subjectVIETNAMen_NZ
dc.subjectATTENUATIONen_NZ
dc.subjectTRANSPORTen_NZ
dc.subjectREGIONSen_NZ
dc.subjectMODELen_NZ
dc.subjectFIELDen_NZ
dc.titleWave-frequency flows within a near-bed vegetation canopyen_NZ
dc.typeJournal Article
dc.identifier.doi10.1016/j.csr.2017.06.003en_NZ
dc.relation.isPartOfContinental Shelf Researchen_NZ
pubs.begin-page91
pubs.elements-id195198
pubs.end-page101
pubs.publication-statusPublisheden_NZ
pubs.volume147en_NZ
dc.identifier.eissn1873-6955en_NZ


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