Stokes drift through corals
Joseph J. Webber (1), Herbert E. Huppert (2) ((1) Department of Applied Mathematics, Theoretical Physics, University of Cambridge, (2) King's College, University of Cambridge)

TL;DR
This paper develops a physical model for Stokes drift in coral reef environments, accounting for flow above and within porous beds, with implications for reef ecosystem health.
Contribution
It introduces a coupled flow model using velocity potential and Darcy's law, including complex wavenumber effects, to better understand drift in coral reef systems.
Findings
Model matches measurements of drift in coral reefs
Reveals vertical and horizontal drift components
Explains exchange processes between reef and sea
Abstract
We investigate the all-penetrating drift velocities, due to surface wave motion in an effectively inviscid fluid that overlies a saturated porous bed of finite depth. Previous work in this area either neglects the large-scale flow between layers [Phillips (1991)] or only considers the drift above the porous layer [(Monismith (2007)]. We propose a model where flow is described by a velocity potential above the porous layer, and by Darcy's law in the porous bed, with derived matching conditions at the interface between the two layers. The damping effect of the porous bed requires a complex wavenumber k and both a vertical and horizontal Stokes drift of the fluid, unlike the solely horizontal drift first derived by Stokes Stokes (1847) in a pure fluid layer. Our work provides a physical model for coral reefs in shallow seas, where fluid drift both above and within the reef is vitally…
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