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    Fortnightly tides and subtidal motions in a choked inlet

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    1-s2.0-S027277141400081X-main.pdf (2.051Mb)
    Date
    2014-04-12
    Author
    MacMahan, Jamie  Concept link
    van de Kreeke, Jacobus  Concept link
    Reniers, Ad  Concept link
    Elgar, Steve  Concept link
    Raubenheimer, Britt  Concept link
    Thornton, Ed B.  Concept link
    Weltmer, Micah  Concept link
    Rynne, Patrick  Concept link
    Brown, Jenna  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7109
    As published
    https://doi.org/10.1016/j.ecss.2014.03.025
    DOI
    10.1016/j.ecss.2014.03.025
    Keyword
     Tidal choking; Tide; Nonlinear response; Fortnightly response; Subtidal signal; Tidal wave propagation; Inlet 
    Abstract
    Amplitudes of semi-diurnal tidal fluctuations measured at an ocean inlet system decay nearly linearly by 87% between the ocean edge of the offshore ebb-tidal delta and the backbay. A monochromatic, dynamical model for a tidally choked inlet separately reproduces the evolution of the amplitudes and phases of the semi-diurnal and diurnal tidal constituents observed between the ocean and inland locations. However, the monochromatic model over-predicts the amplitude and under-predicts the lag of the lower-frequency subtidal and fortnightly motions observed in the backbay. A dimensional model that considers all tidal constituents simultaneously, balances the along-channel pressure gradient with quadratic bottom friction, and that includes a time-varying channel water depth, is used to show that that these model-data differences are associated with nonlinear interactions between the tidal constituents that are not included in non-dimensional, monochromatic models. In particular, numerical simulations suggest that the nonlinear interactions induced by quadratic bottom friction modify the amplitude and phase of the subtidal and fortnightly backbay response. This nonlinear effect on the low-frequency (subtidal and fortnightly) motions increases with increasing high-frequency (semi-diurnal) amplitude. The subtidal and fortnightly motions influence water exchange processes, and thus backbay temperature and salinity.
    Description
    This paper is not subject to U.S. copyright. The definitive version was published in Estuarine, Coastal and Shelf Science 150, Pt.B (2014): 325-331, doi:10.1016/j.ecss.2014.03.025.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Estuarine, Coastal and Shelf Science 150, Pt.B (2014): 325-331
     

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