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Filtering by: Creator Gordon, N. D. Remove constraint Creator: Gordon, N. D. Decade 2000-2009 Remove constraint Decade: 2000-2009

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  • Decision support systems for forest biodiversity management : a review of tools and an analytical-deliberative framework for understanding their successful application

    Creator:
    Gordon, Sean N.
    Abstract:
    The complexity of forest management has increased with the scope of resources of concern and the level of scrutiny from stakeholders. The design and use of specialized computer software, often referred to as “decision support systems” (DSS), is one method for helping managers deal with this complexity. DSS have proven...
    Resource Type:
    Dissertation
    Full Text:
    ABSTRACT OF THE THESIS OF Sean N. Gordon for the degree of Doctor of Philosophy in Forest Resources

  • Understanding the Decision-Making Capacity of Oregon Coastal Watershed Councils

    Creator:
    Cumming, Gordon D.
    Abstract:
    In 1995, Oregon introduced the Oregon Plan for Salmon and Watersheds (formerly the Oregon Coho Salmon Recovery Initiative; OCRSI), a statewide cooperative effort between government and citizens. The Oregon Plan promotes voluntary and locally determined salmonid and watershed restoration initiatives. Watershed councils - groups comprised of citizens, federal and state...
    Resource Type:
    Masters Thesis

  • Microstructure estimates of turbulent salinity flux and the dissipation spectrum of salinity

    Creator:
    Nash, Jonathan D. and Moum, James N.
    Abstract:
    Direct determination of the irreversible turbulent flux of salinity in the ocean has not been possible because of the complexity of measuring salinity on the smallest scales over which it mixes. Presented is an analysis of turbulent salinity microstructure from measurements using a combined fast-conductivity/temperature probe on a slowly falling...
    Resource Type:
    Article
    Full Text:
    Turbulent Salinity Flux and the Dissipation Spectrum of Salinity JONATHAN D. NASH* AND JAMES N. MOUM

  • Length scales of turbulence in stably stratified mixing layers

    Creator:
    Smyth, William D. and Moum, James N.
    Abstract:
    Turbulence resulting from Kelvin–Helmholtz instability in layers of localized stratification and shear is studied by means of direct numerical simulation. Our objective is to present a comprehensive description of the turbulence evolution in terms of simple, conceptual pictures of shear–buoyancy interaction that have been developed previously based on assumptions of...
    Resource Type:
    Article
    Full Text:
    2000 Length scales of turbulence in stably stratified mixing layers William D. Smytha) and James N

  • 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

  • Mixing Measurements on an Equatorial Ocean Mooring

    Creator:
    Moum, J. N. and Nash, J. D.
    Abstract:
    Vaned, internally recording instruments that measure temperature fluctuations using FP07 thermistors, including fluctuations in the turbulence wavenumber band, have been built, tested, and deployed on a Tropical Atmosphere Ocean (TAO) mooring at 0°, 140°W. These were supplemented with motion packages that measure linear accelerations, from which an assessment of cable...
    Resource Type:
    Article
    Full Text:
    Mooring J. N. MOUM AND J. D. NASH College of Oceanic and Atmospheric Sciences, Oregon State University

  • A New Look at Richardson Number Mixing Schemes for Equatorial Ocean Modeling

    Creator:
    Zaron, Edward D. and Moum, James N.
    Abstract:
    A reexamination of turbulence dissipation measurements from the equatorial Pacific shows that the turbulence diffusivities are not a simple function of the gradient Richardson number. A widely used mixing scheme, the K-profile parameterization, overpredicts the turbulent vertical heat flux by roughly a factor of 4 in the stably stratified region...
    Resource Type:
    Article
    Full Text:
    surface boundary layer and low-gradient regions are excluded. OCTOBER 2009 Z A R O N A N D M O U M 2655

  • Topographically Induced Drag and Mixing at a Small Bank on the Continental Shelf

    Creator:
    Moum, J. N. and Nash, J. D.
    Abstract:
    Recent turbulence measurements over a small bank on the continental shelf off Oregon reveal a previously undetected site for intense mixing of the coastal ocean. The flow is hydraulically controlled and turbulence diffusivities over the bank are more than 100 times greater than estimates made on the shelf away from...
    Resource Type:
    Article
    Full Text:
    phoc_30_1106.2049_2054.tp 1 AUGUST 2000 2049M O U M A N D N A S H q

  • Seafloor Pressure Measurements of Nonlinear Internal Waves

    Creator:
    Moum, J. N. and Nash, J. D.
    Abstract:
    Highly resolved pressure measurements on the seafloor over New Jersey’s continental shelf reveal the pressure signature of nonlinear internal waves of depression as negative pressure perturbations. The sign of the perturbation is determined by the dominance of the internal hydrostatic pressure (p⁰Wh) due to isopycnal displacement over the contributions of...
    Resource Type:
    Article

  • Anistropy of turbulence in stably stratified mixing layers

    Creator:
    Smyth, William D. and Moum, James N.
    Abstract:
    Direct numerical simulations of turbulence resulting from Kelvin–Helmholtz instability in stably stratified shear flow are used to study sources of anisotropy in various spectral ranges. The set of simulations includes various values of the initial Richardson and Reynolds numbers, as well as Prandtl numbers ranging from 1 to 7. We...
    Resource Type:
    Article
    Full Text:
    2000 Anisotropy of turbulence in stably stratified mixing layers William D. Smytha) and James N. Moum