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    Wave generation, dissipation, and disequilibrium in an embayment with complex bathymetry

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    Article (3.057Mb)
    Date
    2018-10-04
    Author
    Chen, Jia-Lin  Concept link
    Ralston, David K.  Concept link
    Geyer, W. Rockwell  Concept link
    Sommerfield, Christopher K.  Concept link
    Chant, Robert J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10834
    As published
    https://doi.org/10.1029/2018JC014381
    DOI
    10.1029/2018JC014381
    Keyword
     estuarine hydrodynamics; wave energy; equilibrium wave; anthropogenic impact 
    Abstract
    Heterogeneous, sharply varying bathymetry is common in estuaries and embayments, and complex interactions between the bathymetry and wave processes fundamentally alter the distribution of wave energy. The mechanisms that control the generation and dissipation of wind waves in an embayment with heterogeneous, sharply varying bathymetry are evaluated with an observational and numerical study of the Delaware Estuary. Waves in the lower bay depend on both local wind forcing and remote wave forcing from offshore, but elsewhere in the estuary waves are controlled by the local winds and the response of the wavefield to bathymetric variability. Differences in the wavefield with wind direction highlight the impacts of heterogeneous bathymetry and limited fetch. Under the typical winter northwest wind conditions waves are fetch‐limited in the middle estuary and reach equilibrium with local water depth only in the lower bay. During southerly wind conditions typical of storms, wave energy is near equilibrium in the lower bay, and midestuary waves are attenuated by the combination of whitecapping and bottom friction, particularly over the steep, longitudinal shoals. Although the energy dissipation due to bottom friction is generally small relative to whitecapping, it becomes significant where the waves shoal abruptly due to steep bottom topography. In contrast, directional spreading keeps wave heights in the main channel significantly less than local equilibrium. The wave disequilibrium in the deep navigational channel explains why the marked increase in depth by dredging of the modern channel has had little impact on wave conditions.
    Description
    Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Wave generation, dissipation, and disequilibrium in an embayment with complex bathymetry. Journal of Geophysical Research-Oceans, 123(11), (2018): 7856-7876, doi:10.1029/2018JC014381.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Chen, J.-L., Ralston, D. K., Geyer, W. R., Sommerfield, C. K., & Chant, R. J. (2018). Wave generation, dissipation, and disequilibrium in an embayment with complex bathymetry. Journal of Geophysical Research: Oceans, 123, 7856–7876.
     
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