Index Catalog // ScholarsArchive@OSU

Quantifying the length-scale dependence of surf zone advection

Creator:: Wilson, Greg W., Özkan-Haller, H. Tuba, and Holman, Robert A.
Abstract:: We investigate the momentum balance in the surf zone, in a setting which is weakly varying in the alongshore direction. Our focus is on the role of nonlinear advective terms. Using numerical experiments, we find that advection tends to counteract alongshore variations in momentum flux, resulting in more uniform kinematics....
Resource Type:: Article
Full Text:: dependence of surf zone advection Greg W. Wilson,1 H. Tuba €Ozkan-Haller,1 and Robert A. Holman1 Received

Bathymetry Estimation Using Drifter-Based Velocity Measurements on the Kootenai River, Idaho

Creator:: Landon, Kyle C., Wilson, Greg W., Özkan-Haller, H. Tuba, and MacMahan, Jamie H.
Abstract:: Velocity measurements from drifter GPS records are used in an ensemble-based data assimilation technique to extract the river bathymetry. The method is tested on a deep meandering reach and a shallow braided reach of the Kootenai River in Idaho. The Regional Ocean Modeling System (ROMS) is used to model numerous...
Resource Type:: Article
Full Text:: the Kootenai River, Idaho Landon, Kyle C., Greg W. Wilson, H. Tuba Özkan-Haller, Jamie H. MacMahan

Ensemble-Based Data Assimilation for Estimation of River Depths

Creator:: Wilson, Greg and Özkan-Haller, H. Tuba
Abstract:: A method is presented for estimating bathymetry in a river, based on observations of depth-averaged velocity during steady flow. The estimator minimizes a cost function that combines known information in the form of a prior estimate and measured data (including measurement noise). State augmentation is used to relate the measured...
Resource Type:: Article
Full Text:: Estimation of River Depths GREG WILSON AND H. TUBA ÖZKAN-HALLER College of Earth, Ocean, and Atmospheric

Anomalous Diffusion of Sand Tracer Particles Under Waves

Creator:: Wilson, Gregory W.
Abstract:: A model is presented for the horizontal and vertical diffusion of sand tracer particles by waves and is verified using a reanalysis of the experiments of Miller and Komar (1979, ). In the model, sand particles take random jumps at a rate associated with the wave period but also can...
Resource Type:: Article
Full Text:: Anomalous Diffusion of Sand Tracer Particles Under Waves1 Gregory W. Wilson2 1Oregon State University

Data assimilation for prediction of shallow water flows with uncertain bathymetry

Creator:: Wilson, Gregory W.
Abstract:: A new method is introduced for incorporating bathymetric uncertainty into predictions of nearshore and river flows (i.e., unstratified flows primarily forced by pressure and radiation stress gradients). The method involves the use of the ensemble Kalman filter (EnKF) as a parameter estimation scheme, where the parameter to be estimated is...
Resource Type:: Dissertation
Full Text:: Uncertain Bathymetry AN ABSTRACT OF THE DISSERTATION OF Gregory W. Wilson for the degree of Doctor of

Prey dominance shapes trophic structure of the northern California Current pelagic food web: evidence from stable isotopes and diet analysis

Creator:: Miller, Todd W., Brodeur, Richard D., Rau, Greg, and Omori, Koji
Abstract:: Eastern boundary current (EBC) upwelling zones are among the most productive of marine ecosystems globally and have been generalized in terms of their food web structure. Little empirically based evidence exists to suggest that there is any one form of trophic control of EBC systems and, because of logistical constraints,...
Resource Type:: Article
Full Text:: diet analysis Todd W. Miller1,*, Richard D. Brodeur2, Greg Rau3, Koji Omori1 1Center for Marine

The Influence of Expansive Additives on Early Age Shrinkage and Stress Development

Creator:: Wilson, Cameron, Ideker, Jason, and Weiss, W. Jason
Abstract:: The objective of this project was to investigate the performance of three different expansive additives on the hydration properties, volume change, and stress development of Portland cement pastes and concrete.
Resource Type:: Technical Report
Full Text:: (SCG) Prepared by: Cameron Wilson, M.S. Jason Ideker, Ph.D. Jason Weiss, Ph.D

Phylogenetic placement of the ectomycorrhizal genus Cenococcum in Gloniaceae (Dothideomycetes)

Creator:: Spatafora, Joseph W., Owensby, C. Alisha, Douhan, Greg W., Boehm, Eric W. A., and Schoch, Conrad L.
Abstract:: Cenococcum is a genus of ectomycorrhizal Ascomycota that has a broad host range and geographic distribution. It is not known to produce either meiotic or mitotic spores and is known to exist only in the form of hyphae, sclerotia and host-colonized ectomycorrhizal root tips. Due to its lack of sexual...
Resource Type:: Article
Full Text:: Plant Pathology, Oregon State University, Corvallis, Oregon 97330 Greg W. Douhan Department of Plant

Data assimilation and bathymetric inversion in a two‐dimensional horizontal surf zone model

Creator:: Wilson, G. W., Özkan-Haller, H. Tuba, and Holman, R. A.
Abstract:: A methodology is described for assimilating observations in a steady state twodimensional horizontal (2‐DH) model of nearshore hydrodynamics (waves and currents), using an ensemble‐based statistical estimator. In this application, we treat bathymetry as a model parameter, which is subject to a specified prior uncertainty. The statistical estimator uses state augmentation...
Resource Type:: Article
Full Text:: inversion in a two‐dimensional horizontal surf zone model G. W. Wilson,1 H. T. Özkan‐Haller,1 and R. A

Predicting Polycyclic Aromatic Hydrocarbon Concentrations in Resident Aquatic Organisms Using Passive Samplers and Partial Least-Squares Calibration

Creator:: Forsberg, Norman D., Smith, Brian W., Sower, Greg J., and Anderson, Kim A.
Abstract:: The current work sought to develop predictive models between time-weighted average polycyclic aromatic hydrocarbon (PAH) concentrations in the freely dissolved phase and those present in resident aquatic organisms. We deployed semipermeable membrane passive sampling devices (SPMDs) and collected resident crayfish (Pacifastacus leniusculus) at nine locations within and outside of the...
Resource Type:: Article

ScholarsArchive@OSU

Quantifying the length-scale dependence of surf zone advection

Bathymetry Estimation Using Drifter-Based Velocity Measurements on the Kootenai River, Idaho

Ensemble-Based Data Assimilation for Estimation of River Depths

Anomalous Diffusion of Sand Tracer Particles Under Waves

Data assimilation for prediction of shallow water flows with uncertain bathymetry

Prey dominance shapes trophic structure of the northern California Current pelagic food web: evidence from stable isotopes and diet analysis

The Influence of Expansive Additives on Early Age Shrinkage and Stress Development

Phylogenetic placement of the ectomycorrhizal genus Cenococcum in Gloniaceae (Dothideomycetes)

Data assimilation and bathymetric inversion in a two‐dimensional horizontal surf zone model

Predicting Polycyclic Aromatic Hydrocarbon Concentrations in Resident Aquatic Organisms Using Passive Samplers and Partial Least-Squares Calibration

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