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    The importance of nonlinear internal waves in a deep subalpine lake: Lake Iseo, Italy

    Access Status
    Open access via publisher
    Authors
    Vilhena, L.
    Marti, Clelia
    Imberger, J.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Vilhena, L. and Marti, C. and Imberger, J. 2013. The importance of nonlinear internal waves in a deep subalpine lake: Lake Iseo, Italy. Limnology and Oceanography. 58 (5): pp. 1871-1891.
    Source Title
    Limnology and Oceanography
    DOI
    10.4319/lo.2013.58.5.1871
    ISSN
    0024-3590
    School
    Sustainable Engineering Group
    URI
    http://hdl.handle.net/20.500.11937/65736
    Collection
    • Curtin Research Publications
    Abstract

    The energy transfer from basin-scale internal waves to internal nonlinear waves was investigated in a large, deep subalpine lake through a combination of field data and three-dimensional hydrostatic and nonhydrostatic modeling. The response of the internal wave field induced by two storm events, with distinct characteristics, showed that, for the whole lake, around 15% of the total potential energy contained in the basin-scale internal waves was transferred to nonlinear internal waves in response to moderate forcing, the large transfer being the direct result of the small surface layer thickness compared with the depth of the lake. Locally, the energy transfer to nonlinear waves was up to 30% for the more severe forcing. To model such energy transfers, a nonhydrostatic three-dimensional hydrodynamic model was required; this implies that the inclusion of nonhydrostatic effects is essential for accurate modeling of ecological processes in deep large lakes, which is a challenge considering currently available computational resources. © 2013, by the Association for the Sciences of Limnology and Oceanography, Inc.

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