Residence time in aquatic canopies in wave-dominated flows

Maryam Abdolahpour, Marco Ghisalberti, Paul Lavery, Kathryn McMahon, Magnus Hambleton

Research output: Chapter in Book/Conference paperConference paperpeer-review

Abstract

The large-scale ecological and environmental impact of coastal
canopies is tightly limited by the exchange of water across their
boundaries. In coastal environments, where the flow is typically
wave-dominated, vertical mixing is believed to be the dominant
process controlling residence time (Tres). Recent experiments
of wave-driven flows over rough boundaries, however,
have revealed the generation of a strong onshore mean current
(up to 50% of the orbital velocity far above the canopy) near the
canopy top. It is therefore imperative to understand that these
two processes, i.e. horizontal advection and vertical mixing,
can control residence time in coastal canopies. Through consideration
of a Peclet number (the ratio of diffusive to advective
time scales), this study presents a framework for quantitative
prediction of residence time in these environments. Results
reveal that Pe depends heavily on wave and canopy properties
and may vary significantly in real coastal canopies. Quantitative
predictions for residence time in the limit of Pe 1 (mixingdominated
exchange) and Pe 1 (advection-dominated exchange)
are presented. For Pe ∼ O(1), characterization of each
process will be necessary in describing residence time in these
systems.
Original languageEnglish
Title of host publicationProceedings of the 20th Australasian Fluid Mechanics Conference
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9781740523776
ISBN (Print)978-1-74052-377-6
Publication statusPublished - 5 Dec 2016
Event20th Australasian Fluid Mechanics Conference - University of Western Australia, Perth, Australia
Duration: 5 Dec 20168 Dec 2016
Conference number: 20
http://www.afms.org.au/20AFMC/

Conference

Conference20th Australasian Fluid Mechanics Conference
Abbreviated titleAFMC
Country/TerritoryAustralia
CityPerth
Period5/12/168/12/16
Internet address

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