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dc.contributor.authorHorstman, Erik M.en_NZ
dc.contributor.authorBryan, Karin R.en_NZ
dc.contributor.authorMullarney, Julia C.en_NZ
dc.contributor.authorPilditch, Conrad A.en_NZ
dc.coverage.spatialMardan Palance Hotel, Antalya, Turkeyen_NZ
dc.date.accessioned2017-08-14T02:17:55Z
dc.date.available2016en_NZ
dc.date.available2017-08-14T02:17:55Z
dc.date.issued2016en_NZ
dc.identifier.citationHorstman, E. M., Bryan, K. R., Mullarney, J. C., & Pilditch, C. A. (2016). Model versus nature: Hydrodynamics in mangrove pneumatophores. In Proceedings of 35th Conference on Coastal Engineering. Mardan Palance Hotel, Antalya, Turkey.en
dc.identifier.isbn978-0-9896611-3-3en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11275
dc.description.abstractWater flows through submerged and emergent vegetation control the transport and deposition of sediment in coastal wetlands. Many past studies into the hydrodynamics of vegetation fields have used idealized vegetation mimics, mostly rigid dowels of uniform height. In this study, a canopy of real mangrove pneumatophores was reconstructed in a flume to quantify flow and turbulence within and above this canopy. At a constant flow forcing, an increase in pneumatophore density, from 71 m⁻² to 268 m⁻², was found to cause a reduction of the within-canopy flow velocities, whereas the over-canopy flows increased. Within-canopy velocities reduced to 46% and 27% of the free-stream velocities for the lowest and highest pneumatophore densities, respectively, resulting in stronger vertical shear and hence greater turbulence production around the top of the denser pneumatophore canopies. The maximum Reynolds stress was observed at 1.5 times the average pneumatophore height, in contrast to uniform-height canopies, in which the maximum occurs at approximately the height of the vegetation. The ratios of the within-canopy velocity to the free-stream velocity for the pneumatophores were found to be similar to previous observations with uniform-height vegetation mimics for the same vegetation densities. However, maxima of the scaled friction velocity were two times smaller over the real pneumatophore canopies than for idealized dowel canopies, due to the reduced velocity gradients over the variable-height pneumatophores compared to uniform-height dowels. These findings imply that results from previous studies with idealized and uniform vegetation mimics may have limited application when considering sediment transport and deposition in real vegetation, as the observed turbulence characteristics in nonuniform canopies deviate significantly from those in dowel canopies.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.relation.urihttps://icce-ojs-tamu.tdl.org/icce/index.php/icce/article/view/8254/pdf
dc.rights© 2016 copyright with the author
dc.sourceConference on Coastal Engineeringen_NZ
dc.subjectVegetated flowsen_NZ
dc.subjectPneumatophoresen_NZ
dc.subjectFlume experimentsen_NZ
dc.subjectFlow profilesen_NZ
dc.subjectTurbulence productionen_NZ
dc.subjectvegetated flows
dc.subjectpneumatophores
dc.subjectflume experiments
dc.subjectflow profiles
dc.subjectturbulence production
dc.titleModel versus nature: Hydrodynamics in mangrove pneumatophoresen_NZ
dc.typeConference Contribution
dc.relation.isPartOfProceedings of 35th Conference on Coastal Engineeringen_NZ
pubs.elements-id195293
pubs.finish-date2016-11-20en_NZ
pubs.publisher-urlhttps://journals.tdl.org/icce/index.php/icce/issue/view/363/showTocen_NZ
pubs.start-date2017-11-17en_NZ


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