• Login
    About WHOAS
    View Item 
    •   WHOAS Home
    • USGS Woods Hole Coastal and Marine Science Center
    • Sediment Transport
    • View Item
    •   WHOAS Home
    • USGS Woods Hole Coastal and Marine Science Center
    • Sediment Transport
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of WHOASCommunities & CollectionsBy Issue DateAuthorsTitlesKeywordsThis CollectionBy Issue DateAuthorsTitlesKeywords

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Implementation of the vortex force formalism in the coupled ocean-atmosphere-wave-sediment transport (COAWST) modeling system for inner shelf and surf zone applications

    Thumbnail
    View/Open
    Kumar_et_al_2012.pdf (4.251Mb)
    Date
    2012-01
    Author
    Kumar, Nirnimesh  Concept link
    Voulgaris, George  Concept link
    Warner, John C.  Concept link
    Olabarrieta, Maitane  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/5231
    As published
    https://doi.org/10.1016/j.ocemod.2012.01.003
    Keyword
     Vortex-force; Wave-current interaction; COAWST; ROMS; SWAN; Radiation stress; Three-dimensional; Modeling; Rip current; Littoral velocities; Nearshore circulation; Bottom streaming 
    Abstract
    The coupled ocean-atmosphere-wave-sediment transport modeling system (COAWST) enables simulations that integrate oceanic, atmospheric, wave and morphological processes in the coastal ocean. Within the modeling system, the three-dimensional ocean circulation module (ROMS) is coupled with the wave generation and propagation model (SWAN) to allow full integration of the effect of waves on circulation and vice versa. The existing wave-current coupling component utilizes a depth dependent radiation stress approach. In here we present a new approach that uses the vortex force formalism. The formulation adopted and the various parameterizations used in the model as well as their numerical implementation are presented in detail. The performance of the new system is examined through the presentation of four test cases. These include obliquely incident waves on a synthetic planar beach and a natural barred beach (DUCK’ 94); normal incident waves on a nearshore barred morphology with rip channels; and wave-induced mean flows outside the surf zone at the Martha’s Vineyard Coastal Observatory (MVCO). Model results from the planar beach case show good agreement with depth-averaged analytical solutions and with theoretical flow structures. Simulation results for the DUCK’ 94 experiment agree closely with measured profiles of cross-shore and longshore velocity data from Garcez-Faria et al. (1998, 2000). Diagnostic simulations showed that the nonlinear processes of wave roller generation and wave-induced mixing are important for the accurate simulation of surf zone flows. It is further recommended that a more realistic approach for determining the contribution of wave rollers and breaking induced turbulent mixing can be formulated using non-dimensional parameters which are functions of local wave parameters and the beach slope. Dominant terms in the cross-shore momentum balance are found to be the quasi-static pressure gradient and breaking acceleration. In the alongshore direction, bottom stress, breaking acceleration, horizontal advection and horizontal vortex forces dominate the momentum balance. The simulation results for the bar / rip channel morphology case clearly show the ability of the modeling system to reproduce horizontal and vertical circulation patterns similar to those found in laboratory studies and to numerical simulations using the radiation stress representation. The vortex force term is found to be more important at locations where strong flow vorticity interacts with the wave-induced Stokes flow field. Outside the surf zone, the three-dimensional model simulations of wave-induced flows for non- breaking waves closely agree with flow observations from MVCO, with the vertical structure of the simulated flow varying as a function of the vertical viscosity as demonstrated by Lentz et al. (2008).
    Description
    Author Posting. © The Author(s), 2012. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Ocean Modelling 47 (2012): 65-95, doi:10.1016/j.ocemod.2012.01.003.
    Collections
    • Sediment Transport
    Suggested Citation
    Preprint: Kumar, Nirnimesh, Voulgaris, George, Warner, John C., Olabarrieta, Maitane, "Implementation of the vortex force formalism in the coupled ocean-atmosphere-wave-sediment transport (COAWST) modeling system for inner shelf and surf zone applications", 2012-01, https://doi.org/10.1016/j.ocemod.2012.01.003, https://hdl.handle.net/1912/5231
     

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail

      The role of morphology and wave-current interaction at tidal inlets : an idealized modeling analysis 

      Olabarrieta, Maitane; Geyer, W. Rockwell; Kumar, Nirnimesh (John Wiley & Sons, 2014-12-23)
      The outflowing currents from tidal inlets are influenced both by the morphology of the ebb-tide shoal and interaction with incident surface gravity waves. Likewise, the propagation and breaking of incident waves are affected ...
    • Thumbnail

      Wave-current interaction in Willapa Bay 

      Olabarrieta, Maitane; Warner, John C.; Kumar, Nirnimesh (American Geophysical Union, 2011-12-13)
      This paper describes the importance of wave-current interaction in an inlet-estuary system. The three-dimensional, fully coupled, Coupled Ocean-Atmosphere-Wave-Sediment Transport (COAWST) modeling system was applied in ...
    • Thumbnail

      Modeling marsh dynamics using a 3-D coupled wave-flow-sediment model 

      Kalra, Tarandeep S.; Ganju, Neil K.; Aretxabaleta, Alfredo L.; Carr, Joel A.; Defne, Zafer; Moriarty, Julia M. (Frontiers Media, 2021-11-02)
      Salt marshes are dynamic biogeomorphic systems that respond to external physical factors, including tides, sediment transport, and waves, as well as internal processes such as autochthonous soil formation. Predicting the ...
    All Items in WHOAS are protected by original copyright, with all rights reserved, unless otherwise indicated. WHOAS also supports the use of the Creative Commons licenses for original content.
    A service of the MBLWHOI Library | About WHOAS
    Contact Us | Send Feedback | Privacy Policy
    Core Trust Logo