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Filtering by: Creator Nash, Jonathan Remove constraint Creator: Nash, Jonathan Language English [eng] Remove constraint Language: English [eng]

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  • Tide-topography coupling on a continental slope

    Creator:
    Kelly, Samuel M.
    Abstract:
    Tide-topography coupling is important for understanding surface-tide energy loss, the intermittency of internal tides, and the cascade of internal-tide energy from large to small scales. Although tide-topography coupling has been observed and modeled for 50 years, the identification of surface and internal tides over arbitrary topography has not been standardized....
    Resource Type:
    Dissertation
    Full Text:
    Coupling on a Continental Slope Abstract approved: Jonathan D. Nash Tide-topography coupling is

  • Engineering a Profiling System for a Robotic Oceanographic Surface Sampler

    Creator:
    Shannon, Robert J.
    Abstract:
    ROSS (Robotic Oceanographic Surface Sampler) is an autonomous boat, equipped with oceanographic sensors, used for studying the ocean’s surface. One of its advantages over traditional research vessels is its ability to sample near glaciers, an area too dangerous for manned ships. In order to properly ascertain deep ocean heat’s effect...
    Resource Type:
    Honors College Thesis
    Full Text:
    :_____________________________________________________ Jonathan Nash ROSS (Robotic Oceanographic Surface Sampler) is an autonomous boat

  • Dynamics of the Columbia River tidal plume

    Creator:
    Kilcher, Levi F.
    Abstract:
    This dissertation investigates the dynamics of the tidally modulated outflow from the Columbia River mouth using high resolution measurements of velocity, density and turbulent microstructure. At high tide, flow through the river mouth reverses from flood (onshore) to ebb (offshore). During ebb, buoyant fluid issues from the river mouth and...
    Resource Type:
    Dissertation
    Full Text:
    the Columbia River tidal plume Abstract approved: Jonathan D. Nash This dissertation investigates

  • Topics in ocean turbulence : thermocouples, salt fluxes, and internal hydraulics

    Creator:
    Nash, Jonathan D.
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Jonathan D. Nash for the

  • Quantification of advection and dispersion in lateral subsurface flowpaths at the hillslope-scale

    Creator:
    Victory, Nichole I.
    Abstract:
    It is becoming increasingly important to understand fundamental hillslope-scale hydrological processes. Most hillslope-sale transport experiments have generally focused on conceptual findings or other aspect of flow behavior, rather than the quantification of the mass transport mechanisms of advection and dispersion. When the velocities have been quantified, dispersion has been mentioned...
    Resource Type:
    Masters Thesis
    Full Text:
    : __________________________________________ Jonathan D. Istok It is becoming increasingly important to understand fundamental hillslope

  • Measuring Bubble Pressure in Glacier Ice

    Creator:
    Clonch, Cameron E.
    Abstract:
    Recent observations of tidewater glaciers find that the currently accepted model for predicting ice melt vastly underestimates observed melt rates. The release of pressurized air bubbles into the ocean from pores in the ice is one process that can amplify glacier melt. To incorporate this process into models, we need...
    Resource Type:
    Honors College Thesis
    Full Text:
    and Construction Engineering Jonathan Nash, Committee Member, representing College of Earth, Ocean

  • Estimating the in situ Stratification via Remotely-sensed Internal Wave Speeds

    Creator:
    Fang, Chufan
    Abstract:
    This work investigates a methodology for estimating the ocean stratification gradient based on high-resolution, in space and time, remote sensing observations of internal wave propagation speeds. The internal wave speed observations were collected using a shore-based, X-band marine radar and the ocean vertical density profiles were collected simultaneously from an...
    Resource Type:
    Masters Thesis
    Full Text:
    Wengrove, Dr. James Lerczak and Dr. Jonathan Nash. I have been working in the research group for more than

  • Observations of cross-shore sediment transport and formulation of the undertow

    Creator:
    Guannel, Gregory E.
    Abstract:
    A new set of data from a large-scale sand bar migration experiment is presented. During this experiment, two sandbars were generated. One of the bar was generated by the action of undertow, and sediment moved offshore. The other bar was generated by the shoreward movement of sediment coming from the...
    Resource Type:
    Dissertation
    Full Text:
    . Finally, I would like to thank Dr. Jonathan Nash for showing me the beauty of u∂xu. I would also like to

  • Structure and dynamics of the Columbia River tidal plume front

    Creator:
    Kilcher, Levi F. and Nash, Jonathan D.
    Abstract:
    Time‐dependent buoyant plumes form at the outflow of tidally dominated estuaries. When estuary discharge velocity exceeds plume internal wave speed c, a sharp front forms at the plume’s leading edge that expands from the time‐dependent source. Using observations of the Columbia River tidal plume from multiple tidal cycles we characterize...
    Resource Type:
    Article
    Full Text:
    dynamics of the Columbia River tidal plume front Levi F. Kilcher1 and Jonathan D. Nash1 Received 21

  • Internal hydraulic flows on the continental shelf: High drag states over a small bank

    Creator:
    Nash, Jonathan D. and Moum, James N.
    Abstract:
    Observations of currents, hydrography, and turbulence provide unambiguous evidence for hydraulic control of flow over an isolated three-dimensional topographic feature on Oregon’s continental shelf. The flow becomes critical at the crest of the bank, forming a strong supercritical downslope flow in the lower layer. Farther downstream, internal hydraulic jumps form...
    Resource Type:
    Article
    Full Text:
    Jonathan D. Nash • and James N. Moum College of Oceanic and Atmospheric Sciences, Oregon State University