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  • AME Seminar

    Wed, Apr 12, 2023 @ 03:30 PM - 04:30 PM

    Aerospace and Mechanical Engineering

    Conferences, Lectures, & Seminars

    Speaker: Kristen Davis, UC Irvine

    Talk Title: Large Amplitude Internal Wave Transformation Between 500m and the Surfzone

    Abstract: Internal waves strongly influence the physical and chemical environment of coastal ecosystems worldwide. We report novel observations from a dense and rapidly-sampling array spanning depths from 500 m to shore near Dongsha Atoll in the South China Sea to track large amplitude internal solitary wave (ISW) shoaling, breaking, and runup. During the observational period incident ISW amplitudes ranged between 78 m and 146 m with propagation speeds between 1.40 m/s and 2.38 m/s. Fissioning ISWs generated larger trailing elevation waves when the thermocline was deep, and evolved into onshore propagating bores in depths near 100 m. Collapsing ISWs contained significant mixing and reduced upslope bore propagation. Bores on the shallow forereef drove bottom temperature variation in excess of 10 degrees Celsius and near-bottom cross-shore currents in excess of 0.4 m/s. Bores decelerated upslope, consistent with upslope two-layer gravity current theory, though runup extent, Xr, was offshore of the predicted gravity current location. Background stratification affected the bore runup, with Xr farther offshore when the Korteweg-de Vries nonlinearity coefficient, α, was negative. Fronts associated with the shoaling local internal tide, but equal in magnitude to the soliton-generated bores, were observed onshore of 20 m depth.

    Biography: Kristen Davis is an Associate Professor of Civil & Environmental Engineering at the University of California, Irvine. She is an engineer and oceanographer who is interested in studying how physical processes shape coastal waters -“ combining principles of fluid mechanics, oceanography, and ecology. Kristen uses both field observations and numerical tools to examine circulation in the ocean, its natural variability, and influence on marine ecosystems and human-nature interactions. Kristen earned a Ph.D. in Civil and Environmental Engineering at Stanford University in 2009 and was a postdoctoral researcher at the Woods Hole Oceanographic Institution and the Applied Physics Laboratory at the University of Washington. Her recent research is focused on understanding nonlinear internal wave dynamics and the feasibility of the large-scale, offshore cultivation of macroalgae for the production of biofuels and as a strategy to sequester carbon dioxide.

    Host: AME Department

    More Info: https://ame.usc.edu/seminars/

    Webcast: https://usc.zoom.us/j/95805178776?pwd=aEtTRnQ2MmJ6UWE4dk9UMG9GdENLQT09

    Location: John Stauffer Science Lecture Hall (SLH) - 102

    WebCast Link: https://usc.zoom.us/j/95805178776?pwd=aEtTRnQ2MmJ6UWE4dk9UMG9GdENLQT09

    Audiences: Everyone Is Invited

    Contact: Tessa Yao

    Event Link: https://ame.usc.edu/seminars/

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