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Open AccessArticle

Cross-Shelf Transport Through the Interaction among a Coastal Jet, a Topographic Wave, and Tides

1
School of Marine Science & Policy, University of Delaware, Newark, DE 19711, USA
2
Department of Mechanical Engineering, University of Delaware, Newark, DE 19711, USA
*
Author to whom correspondence should be addressed.
Current address: Department of Mathematics, Rowan University, Glassboro, NJ 08028, USA.
Fluids 2020, 5(4), 181; https://doi.org/10.3390/fluids5040181
Received: 14 July 2020 / Revised: 29 September 2020 / Accepted: 12 October 2020 / Published: 16 October 2020
(This article belongs to the Special Issue Lagrangian Transport in Geophysical Fluid Flows)
Shelf break flows are often characterized by along-isobath jets with cross-shelf currents associated with tides and waves guided by variable topography. Here, we address the question: Can a superposition of such flows produce significant aperiodic cross-shelf transport? To answer this question, we use a barotropic analytic model for the jet based on a similarity solution of the shallow water equations over variable topography, a wave disturbance determined by the topography, and a diurnal tidal disturbance. We use standard Lagrangian methods to assess the cross-shelf transport, presenting the results, however, in a Eulerian frame, so as to be amenable to oceanographic observations. The relative roles of the different flow components in cross-shelf transport are assessed through an extensive parameter study. We find that a superposition of all three flow components can indeed produce consequential background aperiodic transport. An application of the model using recent observations from the Texas Shelf demonstrates that a combination of these background mechanisms can produce significant transport under realistic conditions. View Full-Text
Keywords: cross-shelf transport; topographic Rossby waves; finite time Lyapunov exponents; Texas-Louisiana Shelf cross-shelf transport; topographic Rossby waves; finite time Lyapunov exponents; Texas-Louisiana Shelf
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MDPI and ACS Style

Huntley, H.S.; McMahon, C.W.; Kuehl, J.J.; Kirwan, A.D., Jr. Cross-Shelf Transport Through the Interaction among a Coastal Jet, a Topographic Wave, and Tides. Fluids 2020, 5, 181.

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