Index Catalog // ScholarsArchive@OSU

Data Assimilation using Synthetic-Aperture Radar Imagery for Bathymetry Inversion at the Mouth of the Columbia River

Creator:: Harper, Spencer H.
Abstract:: Synthetic-aperture radar (SAR) imagery can provide wavenumber and frequency data to generate bathymetry estimates for locations where limited access or extreme ocean conditions can make standard bathymetry survey techniques difficult or impossible. The availability of SAR data could allow for regular bathymetry estimates of navigational channels providing insight into dredging...
Resource Type:: Masters Thesis
Full Text:: River. Abstract approved:_____________________________________________________ H. Tuba Özkan

Offshore controls on nearshore circulation

Creator:: Long, Joseph W.
Abstract:: The rip current field resulting from the transformation of surface gravity waves over offshore submarine canyons is studied. Employing a wave transformation model and a wave-induced circulation model over observed bathymetry we find that rip current circulation cells exist with alongshore spacing of O(1OOm) even though the nearshore bathymetry displayed...
Resource Type:: Masters Thesis
Full Text:: on Nearshore Circulation Abstract approved: H. Tuba Ozkan-Haller The rip current field resulting

Breaking Waves Offshore: Measurements and Modeling of Energy Dissipation

Creator:: Ticona Rollano, Fadia M.
Abstract:: In the presence of strong winds, ocean surface waves dissipate significant amounts of energy by breaking. Here, breaking rates and wave-following turbulent dissipation rate measurements are compared with numerical WAVEWATCH III estimates of bulk energy dissipation. At high winds, the measurements suggest that turbulent dissipation becomes saturated, however the modeled...
Resource Type:: Masters Thesis
Full Text:: : ______________________________________________________ H. Tuba Özkan‒Haller In the presence of strong winds, ocean surface waves dissipate

Toward wave energy in Oregon : predicting wave conditions and extracted power

Creator:: Oskamp, Jeffrey A.
Abstract:: Knowledge of wave conditions in nearshore regions supports the development of ocean wave energy technology by providing wave climatology for device design considerations, and power output estimates. By modeling wave transformation over the continental shelf, wave conditions were predicted in nearshore regions where potential wave energy conversion sites are located....
Resource Type:: Masters Thesis
Full Text:: would like to thank my advisor, Dr. H. Tuba Özkan-Haller, for the time she spent working with me on

Modeling shallow-water hydrodynamics : rotations, rips, and rivers

Creator:: Long, Joseph W.
Abstract:: Hydrodynamic models are used as a diagnostic tool to understand the temporal variability of shallow-water processes that are difficult to completely resolve with traditional field measurements. For all simulations, modeled quantities are qualitatively or quantitatively compared with available measurements to gain confidence in conclusions derived from the modeled results. In...
Resource Type:: Dissertation
Full Text:: -Water Hydrodynamics: Rotations, Rips, and Rivers Abstract approved: H. Tuba Özkan-Haller

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:: approved: H. Tuba Özkan-Haller A new set of data from a large-scale sand bar migration experiment is

Wave field patterns generated by wave energy converters

Creator:: McNatt, J. Cameron
Abstract:: The eventual deployment of wave energy converters (WECs) on a commercial scale will necessitate the grouping of devices into arrays or "wave farms," in order to minimize overhead costs of mooring, maintenance, installation, and electrical cabling for shoreward power delivery. Closely spaced WECs will interact hydrodynamically through diffracted and radiated...
Resource Type:: Masters Thesis
Full Text:: Patterns Generated by Wave Energy Converters Abstract approved: H. Tuba Özkan-Haller The eventual

Wave propagation processes at the mouth of the Columbia River

Creator:: Andes, Lisa (Lisa Christine)
Abstract:: The mouth of the Columbia River (MCR) has a longstanding reputation of hazardous navigational conditions. This reputation has been developing since the first ship, the Columbia, traversed through the inlet in 1792. The hazardous conditions are related to the large waves and strong tidal currents that are common in the...
Resource Type:: Masters Thesis
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Depth-dependence of surf zone eddies : a study at Duck, NC

Creator:: Aiken, Rebecca A.
Abstract:: Surf zone eddies (f < 0.01 Hz) are important in nearshore mixing, shoreline erosion, the distribution of pollutants, and ecological processes, such as offshore transport of larvae. Surf zone eddies have traditionally been treated as two-dimensional features with horizontal length scales larger than the local water depth. Studies by Lippmann...
Resource Type:: Masters Thesis
Full Text:: : ______________________________________________________ H. Tuba Özkan-Haller Surf zone eddies (f < 0.01 Hz) are important in nearshore mixing

Nearshore wave predictions along the Oregon and southwest Washington coast

Creator:: García-Medina, Gabriel
Abstract:: This thesis contains a manuscript describing the implementation of a high resolution wave forecasting model for the coasts of Washington and Oregon. The purpose of this project was to advance the wave predictive capabilities of the states of Oregon and the southwest part of Washington by including the effects of...
Resource Type:: Masters Thesis
Full Text:: : _____________________________________________________________________ H. Tuba Özkan-Haller This thesis contains a manuscript describing the implementation of a

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:: Shallow Water Flows with Uncertain Bathymetry Abstract approved: ¨ H. Tuba Ozkan-Haller A new

Wave modeling at the mouth of the Columbia River

Creator:: Kassem, Sarah
Abstract:: As the second largest river in the U.S., the entrance to the Columbia River is home to some of the most extreme wave conditions on the Pacific Coast. Winter storms commonly generate waves 6-8 m in height, which in combination with strong tidal currents, can produce dangerous navigation conditions. To...
Resource Type:: Masters Thesis
Full Text:: of the Columbia River Abstract approved: H. Tuba Özkan-Haller As the second largest river in the

Extreme Wave Runup and Runup Variability on Beaches

Creator:: Li, Chuan
Abstract:: Wave runup is an important physical process that affects nearshore sediment transport, coastal erosion, and flooding. Large and unexpected runup events can also be dangerous to beach goers. Extreme runup statistics are essential parameters used in engineering design of marine structures and in coastal management. Although the study of runup...
Resource Type:: Dissertation
Full Text:: and Runup Variability on Beaches Abstract approved: H. Tuba Özkan-Haller Wave runup is an

Wave runup : Physics, variability, and societal impacts

Creator:: García Medina, Gabriel
Abstract:: The U.S. Pacific Northwest is home to one of the most extreme wave climates in the world with waves of 10 m in height arriving to the coast approximately each year. With an average water temperature of 12℃, the beaches in the region are too cold to go on a...
Resource Type:: Dissertation
Full Text:: : Wave Runup: Physics, Variability, and Societal Impacts Abstract approved: H. Tuba Özkan-Haller The

Nearshore hydrodynamic model comparisons and predictions of bathymetric evolution

Creator:: Lescinski, Jamie M.
Abstract:: The surf zone exhibits large energetic signals from wave shoaling and subsequent dissipation due to breaking, forcing circulation. The bathymetry responds to the wave and wave-induced circulation with the growth, transport, and destruction of large scale bathymetric features, such as mega ripples and sand bars. There is an obvious fluctuation...
Resource Type:: Masters Thesis
Full Text:: Abstract approved:-------- ........ ----------------- H. Tuba Ozkan-Haller The surf zone exhibits large

Wave Modeling Results: Baseline Observations and Modeling for the Reedsport Wave Energy Site

Creator:: Özkan-Haller, H. Tuba
Abstract:: Offshore wave conditions along the Oregon coastline are measured at a handful of buoy locations where directional wave information is available. Most of these buoys are located in deep waters and incoming waves undergo changes as they travel from deep water onto the shelf where wave energy conversion arrays are...
Resource Type:: Technical Report
Full Text:: Observations and Modeling for the Reedsport Wave Energy Site Prepared by H. Tuba Ozkan-Haller

Power Output Calculations for an Array of Point-absorber Wave Energy Converters

Creator:: García-Castaño, Manuel
Abstract:: This study presents a methodology for power take off (PTO) forecasting for an array of heave wave energy converters (WECs). Based on spectral data obtained directly from the National Data Buoy Center, representative realistic sea states are generated at the location of the WECs, and by using two wave-structure interaction...
Resource Type:: Masters Thesis
Full Text:: : ____________________________________________________________________ H. Tuba Özkan-Haller This study presents a methodology for power take off (PTO) forecasting

Weather and large waves along the Oregon coast: atmospheric controls on a numerical wave model

Creator:: Ellenson, Ashley N.
Abstract:: In this study, the effects of implementing different wind input or physics packages in a numerical wave model to recreate large wave conditions are explored. Three large wave events are simulated with WaveWatch III. The wind inputs which are compared are NCEP's Global Forecasting System (GFS) with 0.5 degree resolution...
Resource Type:: Masters Thesis
Full Text:: acknowledge my committee members, H. Tuba Özkan-Haller, Jim Thomson, and Merrick Haller for their guidance

Ensemble-based data assimilation and depth inversion on the Kootenai River, ID, USA

Creator:: Landon, Kyle C.
Abstract:: Velocity measurements from drifter GPS records are assimilated and used in an ensemble-based inversion 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, USA. The Regional Ocean Modeling System (ROMS) is used to...
Resource Type:: Masters Thesis
Full Text:: like to thank my advisor, Tuba Özkan-Haller. Tuba has been an integral part of my research, helping

Using Magnetotellurics Towards Imaging the Primary Magma Reservoir in the Cotopaxi Volcano, Ecuador

Creator:: Angel, Kaitlan W. E.
Abstract:: In this study, 3D finite difference and 2D finite element forward modeling were used to create an electromagnetic sensitivity analysis for the Cotopaxi volcano in Ecuador. Magnetotellurics (MT) is a natural-source electromagnetic geophysical technique that images electrical conductivity. Measuring strong contrasts in electrical conductivity in volcanic materials allows for the...
Resource Type:: Masters Thesis
Full Text:: Tuba Özkan-Haller In this study, 3D finite difference and 2D finite element forward modeling

Physical-Environmental Effects of Wave and Offshore Wind Energy Extraction: A Synthesis of Recent Oceanographic Research

Creator:: Haller, Merrick C. and Özkan-Haller, H. Tuba
Abstract:: The ocean deployment of arrays of Wave Energy Converters (WEC arrays) appears likely in the near future, and deployment of offshore wind turbines has already started. These technologies tap into a potential renewable energy resource but also involve complex systems with uncertain environmental consequences that will likely scale with the...
Resource Type:: Presentation
Full Text:: Merrick C. Haller and Tuba Özkan-Haller Oregon State University Oregon State University Chemicals

Publisher's note: "Waves on unsteady currents" [Phys. Fluids 19, 126601 (2007)]

Creator:: Haller, Merrick C. and Özkan-Haller, H. Tuba
Abstract:: This article was originally published online and in print with an incorrect version of Fig. 1. AIP apologizes for this error. All online versions of the article have been corrected.
Resource Type:: Article
Full Text:: . Fluids 19, 126601 „2007…‡ Merrick C. Haller1 and H. Tuba Özkan-Haller2 1School of Civil and Construction

Waves on unsteady currents

Creator:: Haller, Merrick C. and Özkan-Haller, H. Tuba
Abstract:: Models for surface gravity wave propagation in the presence of currents often assume the current field to be quasi-stationary, which implies that the absolute wave frequency is time invariant. However, in the presence of unsteady currents or time-varying water depth, linear wave theory predicts a time variation of the absolute...
Resource Type:: Article
Full Text:: Civil and Construction Engineering, Oregon State University, Corvallis, Oregon 97330, USA H. Tuba Özkan

Field validation of a nearshore circulation model for alongshore-nonuniform flows

Creator:: Wilson, Gregory W.
Abstract:: We investigate, theoretically and experimentally, the problem of modeling depth-integrated (2DH) surf zone circulation on an alongshore-nonuniform natural beach, with waves approaching from an arbitrary angle. An approximate theoretical model is developed, which captures the important effect of advection in the alongshore dynamics, and shows that a nondimensional parameter Re[subscript]s...
Resource Type:: Masters Thesis
Full Text:: Nearshore Circulation Model for Alongshore-Nonuniform Flows Abstract approved: H. Tuba Özkan-Haller

Bathymetry correction using an adjoint component of a coupled nearshore wave-circulation model: Tests with synthetic velocity data

Creator:: Kurapov, Alexander L. and Özkan-Haller, H. Tuba
Abstract:: The impact of assimilation of wave-averaged flow velocities on the bathymetric correction is studied in tests with synthetic (model-generated) data using tangent-linear and adjoint components of a one-way coupled nearshore wave-circulation model. Weakly and strongly nonlinear regimes are considered, featuring energetic unsteady along-beach flows responding to time-independent wave-averaged forcing due...
Resource Type:: Article
Full Text:: Alexander L. Kurapov1 and H. Tuba €Ozkan-Haller1 Received 19 December 2012; revised 1 July 2013; accepted 6

Forcing and variability of nonstationary rip currents

Creator:: Long, J. W. and Özkan-Haller, H. Tuba
Abstract:: urface wave transformation and the resulting nearshore circulation along a section of coast with strong alongshore bathymetric gradients outside the surf zone are modeled for a consecutive 4 week time period. The modeled hydrodynamics are compared to in situ measurements of waves and currents collected during the Nearshore Canyon Experiment...
Resource Type:: Article
Full Text:: : Long, J. W., and H. T. €Ozkan-Haller (2016), Forcing and variability of nonstationary rip currents, J

Effects of wave-current interaction on shear instabilities of longshore currents

Creator:: Özkan-Haller, H. Tuba and Li, Ye
Abstract:: We examine the effects of wave-current interaction on the dynamics of instabilities of the surf zone longshore current. We utilize coupled models for the simulation of the incident waves and the wave-induced nearshore circulation. The coupling between the models occurs through radiation stress gradient terms (accounting for the generation of...
Resource Type:: Article
Full Text:: instabilities of longshore currents H. Tuba Özkan-Haller College of Oceanic and Atmospheric Sciences, Oregon

Low-frequency characteristics of wave group-forced vortices

Creator:: Long, Joseph W. and Özkan-Haller, H. Tuba
Abstract:: The dynamics of vorticity motions forced by wave groups incident on an alongshore-uniform barred beach are analyzed. For both normally and obliquely incident wave groups, the potential vorticity and enstrophy equations reveal that the temporal variability of wave group–forced vortices is directly linked to the variability in the incoming wave...
Resource Type:: Article
Full Text:: vortices Joseph W. Long1 and H. Tuba Özkan-Haller1 Received 1 May 2008; revised 25 March 2009; accepted

Offshore controls on nearshore rip currents

Creator:: Long, Joseph W. and Özkan-Haller, H. Tuba
Abstract:: The rip current field resulting from the transformation of surface gravity waves over offshore submarine canyons is studied. Employing a wave transformation model and a wave-induced circulation model over observed bathymetry we find that wave height variations associated with undulations in the canyon contours cause rip current circulation cells with...
Resource Type:: Article
Full Text:: Joseph W. Long and H. Tuba Özkan-Haller College of Oceanic and Atmospheric Sciences, Oregon State

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

Formulation of the undertow using linear wave theory

Creator:: Guannel, G. and Özkan-Haller, H. Tuba
Abstract:: The undertow is one of the most important mechanisms for sediment transport in nearshore regions. As such, its formulation has been an active subject of research for at least the past 40 years. Still, much debate persists on the exact nature of the forcing and theoretical expression of this current....
Resource Type:: Article
Full Text:: Formulation of the undertow using linear wave theory Guannel, G., & Özkan-Haller, H. T. (2014). Formulation

Power Calculations for a Passively Tuned Point Absorber Wave Energy Converter on the Oregon Coast

Creator:: Oskamp, Jeffrey A. and Özkan-Haller, H. Tuba
Abstract:: A wave-structure interaction model is implemented, and power output estimates are made for a simplified wave energy converter operating in measured spectral wave conditions. In order to estimate power output from a wave energy converter, device response to hydrodynamic forces is computed using a boundary element method potential flow model....
Resource Type:: Article
Full Text:: Geophysical Research, 104(C4):7649–7666, 1999. [5] T. K. A. Brekken, H. T. Özkan-Haller, and A. Simmons. A

Recognizing diverse forms of impact

Creator:: Özkan-Haller, Tuba
Abstract:: This presentation will share thoughts on recognizing diverse forms of impact by faculty.
Resource Type:: Video

Large-scale laboratory observations of wave breaking turbulence on a fixed barred beach

Creator:: Scott, Christopher P.
Abstract:: This thesis presents the details of a large-scale laboratory experiment to study the turbulence generated by waves breaking on a fixed barred beach. The data set includes comprehensive measurements of free surface displacement and fluid velocity for one random and one regular wave case. Observations of the time-averaged turbulent kinetic...
Resource Type:: Masters Thesis
Full Text:: questions and encouragement from my cont mnbers, avtkic Hailer and Tuba kan-Hailer, are much appreciated

Nowcast/forecast of storm surge and drawdown using a hybrid FE/ANN approach

Creator:: Darnell, Joel T.
Abstract:: In the northwestern Gulf of Mexico there is a need for reliable water level forecasts to facilitate safe commercial navigation, marine construction, and emergency management. Though the low amplitude tides of the region can be predicted with conventional harmonic techniques, frequent strong storms make accurate forecasts of water levels difficult....
Resource Type:: Masters Thesis
Full Text:: last 4 years and my committee members, Dr. Merrick Hailer and Dr. Tuba Ozkan-Haller, for their

The impact of wave energy converter arrays on wave-induced forcing in the surf zone

Creator:: O'Dea, Annika, Haller, Merrick C., and Ozkan-Haller, H. Tuba
Abstract:: An alternative metric for assessing nearshore hydrodynamic impact due to Wave Energy Converter (WEC) arrays is presented that is based on the modeled changes in alongshore radiation stress gradients in the lee of the array. The metric is developed using a previously observed relationship between measured radiation stresses and alongshore...
Resource Type:: Article
Full Text:: . Haller a, H. Tuba €Ozkan-Haller b a School of Civil & Construction Engineering, Oregon State University

Assessing physical vulnerability of the coast in light of a changing climate : an integrated, multi-hazard, multi-timescale approach

Creator:: Harris, Erica L.
Abstract:: Hazards threaten coastal communities and ecosystems over a wide range of spatiotemporal scales. One of the most pressing concerns for coastal property owners, decision makers, and researchers is the uncertain role that a changing climate will have on the intensity and frequency of these hazards. The significant uncertainties associated with...
Resource Type:: Masters Thesis
Full Text:: under NOAA Grant #NA06OAR4170010. To my committee members, Jonathan Allan and Tuba Ozkan-Haller

Eddy correlation benthic O₂ exchange rates and characterizations of sediment properties from the central Oregon shelf at 30 meters

Creator:: McCann-Grosvenor, Kristina
Abstract:: Rates of benthic O₂ exchange are important measurements for determining organic matter remineralization, and can shed light on factors driving biogeochemical processes in coastal environments. Measurement of in situ O₂ consumption and production within permeable sediments, such as those found over ~43% of the Oregon-Washington shelf, has traditionally been done...
Resource Type:: Masters Thesis
Full Text:: acknowledge the hard work of Tuba Özkan-Haller for all of her help with the physical oceanography

Modeling Eddy Correlation Biases Created by Velocity Sensitivities of Clark-type Oxygen Microelectrodes Under Waves

Creator:: Albright, Andrea and Albright, Andrea T. P.
Abstract:: Field deployments, flume experiments, and a 2D wave model have been used to identify the characteristics of Clark-type oxygen microelectrodes and measurement parameters that could possibly bias eddy correlation (EC) flux measurements made under waves. Eddy correlation is a technique adapted from atmospheric sciences that couples concurrent and co-located velocity...
Resource Type:: Capstone Project
Full Text:: . Thanks to Tuba Özkan-Haller for teaching me about wave theory and providing the seeds to many of the

Remote sensing of radiation stress gradients from optical imagery

Creator:: Killian, Jason R.
Abstract:: Wave-induced circulation is the defining characteristic of the nearshore. Within this region, the constant feedback cycle between incoming waves, wave-generated currents, and the mobile sediment bed is responsible for the evolution of complex patterns in nearshore and beach morphology. Central to our understanding of this system is knowledge of the...
Resource Type:: Masters Thesis
Full Text:: help me finish this project, and my committee members, Mick Haller and Tuba Özkan-Haller, for their

An Inner-Shelf Wave Forecasting System for the U.S. Pacific Northwest

Creator:: Garcia-Medina, Gabriel, Özkan-Haller, H. Tuba, Ruggiero, Peter, and Oskamp, Jeffrey
Abstract:: An operational inner-shelf wave forecasting system was implemented for the Oregon and southwest Washington coast in the U.S. Pacific Northwest (PNW). High-resolution wave forecasts are useful for navigational planning, identifying wave energy resources, providing information for site-specific coastal flood models, and having an informed recreational beach user group, among other...
Resource Type:: Article
Full Text:: , Oregon State University, Corvallis, Oregon H. TUBA €OZKAN-HALLER AND PETER RUGGIERO College of Earth

Microelectrode Velocity Effects and Aquatic Eddy Covariance Measurements under Waves

Creator:: Reimers, Clare E., Özkan-Haller, H. Tuba, Albright, Andrea T., and Berg, Peter
Abstract:: Interest in validating the eddy covariance (EC) technique under wave-induced flows led to a series of experiments in a 104-m-long large wave flume (LWF) using an acoustic Doppler velocimeter (ADV) and two oxygen microelectrodes (tips ~2 mm apart) mounted on a sturdy tripod. Four additional ADVs positioned within the flume...
Resource Type:: Article
Full Text:: Aquatic Eddy Covariance Measurements under Waves CLARE E. REIMERS, H. TUBA ÖZKAN-HALLER, AND ANDREA T

Nearshore Wind-Wave Forecasting at the Oregon Coast

Creator:: Garcia, Gabriel, Özkan-Haller, H. Tuba, and Ruggiero, Peter
Abstract:: This presentation was given as part of Oregon State University's College of Oceanographic and Atmospheric Sciences graduate student seminar series. It describes the basics of wave forecasting and then focuses on work implementing a wave forecasting system for the Oregon and Southwestern Washington Coast.
Resource Type:: Presentation
Full Text:: the Oregon Coast Gabriel García, H. Tuba Özkan-Haller, Peter Ruggiero November 16, 2011 Wave

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

Mechanistic analysis of the wave-current interaction in the plume region of a partially mixed tidal inlet

Creator:: Moghimi, Saeed, Özkan-Haller, H. Tuba, Akan, Cigdem, and Jurisa, Joseph T.
Abstract:: In this research, a three-dimensional coupled wave-circulation model, including meteorological forcing, freshwater inflow and time varying open boundary conditions, for New River Inlet is validated. A mechanistic approach is taken to investigate how various wave-current interaction mechanisms affect the nearshore circulation, plume expansion and surface wave field in the plume...
Resource Type:: Article
Full Text:: the plume region of a partially mixed tidal inlet. Saeed Moghimia,b,∗, Tuba Ozkan-Hallerc, Cigdem

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

Data for Runups of unusual size: rogueness and variability of swash

Creator:: Garcia Medina, Gabriel, Ozkan-Haller, H. Tuba, Ruggiero, Peter, Holman, Robert A., and Li, Chuan
Abstract:: This repository item contains the files needed to reproduce the results reported in the published work entitled "Runups of unusual size: rogueness and variability of swash" in the Journal of Geophysical Research. As described in the publication, the results described within it pertain to simulations of wave runup for various...
Resource Type:: Dataset

Remote measurements of waves and currents over complex bathymetry

Creator:: Chickadel, Carmine C. (Carmine Christopher)
Abstract:: Waves are the primary input of energy in the nearshore region, and together with the currents forced through the transfer of momentum that occurs during the wave breaking process they are the principal mechanism for sediment transport in the nearshore. The basic physics of waves and currents are thought to...
Resource Type:: Dissertation
Full Text:: committee members, Tuba Ozkan-Haller for her incredible ability to teach even me, Mick Haller for his

Wave-by-Wave Forecasting via Assimilation of Marine Radar Data

Creator:: Simpson, Alexandra Joyce
Abstract:: A wave-by-wave forecasting system is desired for optimization of wave energy conversion devices and for improving safety of vessel-based marine operations. This study outlines the first validation attempts of a recently developed forecasting system called Wavecast. The forecasting approach uses X-Band marine radar images for data assimilation, then reconstructs and...
Resource Type:: Masters Thesis
Full Text:: like to acknowledge. To my committee members, Tuba Özkan-Haller, Ted Brekken and Geoff Hollinger

Analysis of rip current embayments on the Oregon coast

Creator:: Dalon, Matthew M.
Abstract:: Understanding the past, present, and future behavior of our nation's shorelines is vital for sensible coastal management. Localized areas of erosion, termed "erosional hot spots", can shift the shoreline landward threatening coastal infrastructure (Kraus and Galgano, 2001; Stauble and Gravens, 2004; McNinch, 2004). One specific type of erosional hot spot...
Resource Type:: Masters Thesis
Full Text:: my other committee members; Tuba Ozkan-Haller, Peter Ruggiero, and Roger Graham. Together this

Analysis of waves in the near-field of wave energy converter arrays through image processing

Creator:: Black, Colleen
Abstract:: Oregon State University conducted a series of laboratory experiments to measure and quantify the near-field wave effects caused within arrays of Wave Energy Converters (WEC). As the waves and WECs interact, the WECs generate radiated waves; these effects vary with the location within the array. Analyzing the near-field waves will...
Resource Type:: Masters Thesis
Full Text:: Abstract approved: ______________________________________________________ Merrick C. Haller

On the nearshore impact of wave energy converter arrays

Creator:: O'Dea, Annika Magnuson
Abstract:: Radiation stresses, defined as the excess flow of momentum due to the presence of waves (Longuet-Higgins, 1964), are the main drivers behind the cross-shore and longshore forcing that results in wave setup, set-down, and longshore currents (e.g. Svendsen, 2006). Longshore currents entrain and transport sediment and therefore play an important...
Resource Type:: Masters Thesis
Full Text:: , Peter Ruggiero, Tuba Özkan-Haller, and Emily Shroyer for their feedback. Finally, I would like to

Experimental and numerical modeling of wave height attenuation by emergent coastal vegetation

Creator:: Blackmar, Philip James
Abstract:: Coastal vegetation dampens waves which can provide benefits to the local area, but existing literature shows large variations in the degree of wave height attenuation depending on plant properties and wave conditions. Better knowledge of how to predict the wave height decay accurately in different types of vegetation may help...
Resource Type:: Masters Thesis
Full Text:: . Thank you to my committee members, Dan Cox, Peter Ruggiero, Tuba Ozkan- Haller, and John Simonsen for

Coupled wave and surge modeling of Tillamook Bay, Oregon : extreme events and climate change impacts

Creator:: Cheng, Tiffany Kay
Abstract:: Estuaries represent the confluence of land and ocean environments and encompass a number of complex interactions amongst tides, winds, offshore waves and the riverine contributions, all of which contribute to total water levels (TWLs). The study of TWLs and the relative weight of its components can assist local communities in...
Resource Type:: Masters Thesis
Full Text:: Ozkan-Haller and Peter Ruggiero for their insightful critiques and suggestions along the way. With Dr

Assessment of the Active Absorption System of the Large Wave Flume

Creator:: Savić, Una
Abstract:: The Large Wave Flume at the O.H. Hinsdale Wave Research Laboratory houses a piston wavemaker with a built-in active absorption system designed by MTS Systems Corporation. The performance of the active absorption system has not been properly assessed yet. This thesis evaluates the performance of the MTS active absorption system...
Resource Type:: Masters Thesis
Full Text:: . I would like to thank Tuba Ozkan-Haller for always being willing to listen and to Harry Yeh for

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

On the Imaging of Rip Currents in X-band Radar

Creator:: Kloster, Rebecca
Abstract:: Rip currents pose a serious danger to visitors of bathing beaches; they are also an important process in surf zone circulation. Haller et al. [2014] demonstrated that shore-based X-band radar can be used to compliment in situ measurements of rip currents. However, little is known of the underlying radar imaging...
Resource Type:: Masters Thesis
Full Text:: , Tuba Özkan-Haller, Dan Cox, and Ed Brook, for their feedback. Last, I would like to thank the

Laboratory observations and numerical modeling of the effects of an array of wave energy converters

Creator:: Porter, Aaron K.
Abstract:: This thesis investigates the effects of wave energy converters (WECs) on water waves through the analysis of extensive laboratory experiments, as well as subsequent numerical simulations. Data for the analysis was collected during the WEC-Array Experiments performed at the O.H. Hinsdale Wave Research Laboratory at Oregon State University, under co-operation...
Resource Type:: Masters Thesis
Full Text:: : Merrick C. Haller This thesis investigates the effects of wave energy converters (WECs) on water waves

Simulating extreme total water levels using a time-dependent, extreme value approach

Creator:: Serafin, Katherine A.
Abstract:: Coastal flood hazard zones and the design of coastal defenses are often devised using either the maximum recorded total water level (TWL) or a 'design' event such as the 100-year return-level flood, usually projected from observed extreme events. Despite technological advances driving more consistent instrumental records of wave heights and...
Resource Type:: Masters Thesis
Full Text:: is inspiring. To my other committee members, Rob Holman and Tuba Ӧzkan-Haller, thank you for your

Surf zone bathymetry and circulation predictions via data assimilation of remote sensing observations

Creator:: Wilson, G. W., Özkan-Haller, H. Tuba, Holman, R. A., Haller, M. C., Honegger, D. A., and Chickadel, C. C.
Abstract:: Bathymetry is a major factor in determining nearshore and surf zone wave transformation and currents, yet is often poorly known. This can lead to inaccuracy in numerical model predictions. Here bathymetry is estimated as an uncertain parameter in a data assimilation system, using the ensemble Kalman filter (EnKF). The system...
Resource Type:: Article
Full Text:: predictions via data assimilation of remote sensing observations Wilson, G. W., H. T. Özkan-Haller, R. A

Laboratory Observation of Waves in the Vicinity of WEC-Arrays

Creator:: Haller, Merrick C., Porter, Aaron, Lenee-Bluhm, Pukha, Rhinefrank, Ken, Hammagren, Erik, Özkan-Haller, H. Tuba, and Newborn, David
Abstract:: This paper was presented at the 9th European Wave and Tidal Energy Conference held in Southampton, UK September 4-11, 2011.
Resource Type:: Technical Report
Full Text:: , Ken Rhinefrank*, Erik Hammagren*, Tuba Özkan-Haller+3, David Newborn# #School of Civil

The Application of Machine Learning Techniques on Marine Science Models

Creator:: Ellenson, Ashley
Abstract:: A variety of stakeholders require information about marine systems. In the open ocean, pilots of marine vessels require knowledge about environmental conditions for safe passage and route planning. On the coastline, communities rely on information about nearshore dynamics to increase safety from coastal hazards such as nearshore pollutants, coastal erosion,...
Resource Type:: Dissertation
Full Text:: , Y. Pei, G. Wilson, H. Tuba Özkan-Haller, Xiaoli Fern Coastal Engineering https://doi.org/10.1016

Observations and prediction of intermittent sediment suspension in the surf zone

Creator:: Yoon, Hyun Doug
Abstract:: In this dissertation the interactions between hydrodynamics, sediment suspension and transport, and morphological evolution in the surf zone was investigated with a large-scale laboratory experiment data, CROss-Shore Sediment Transport Experiment (CROSSTEX). The data set included comprehensive measurements of water surface elevation, fluid velocity, sediment concentration, and morphology for irregular waves...
Resource Type:: Dissertation
Full Text:: here in Corvallis. I am thankful to Dr. Solomon Yim, Dr. Tuba Ozkan-Haller, Dr. Peter Ruggiero

From the Shoreface to the Foredunes : Coastal Morphodynamics Across the Land-Sea Interface

Creator:: Cohn, Nicholas T.
Abstract:: Coastal flooding and erosion are major concerns for low lying coastal communities -- particularly in light of accelerated sea level rise and climate change. To improve quantitative understanding of the physical drivers of both flooding and coastal landscape change, this dissertation explores coastal morphodynamics bridging the land-sea interface on modally...
Resource Type:: Dissertation
Date Created:
Full Text:: other members of my committee, Tuba Özkan-Haller, Rob Holman, and Michael Olsen as well. I have been

Dune erosion models and swash zone kinematics from remote video observations

Creator:: Palmsten, Margaret L.
Abstract:: The subaerial beach, composed of sand dunes and the foreshore, provides a natural buffer zone between vulnerable land and the dissipation of storm wave energy due to wave breaking. The natural beauty of this region is attractive to people, and as a result, significant investment has been placed in this...
Resource Type:: Dissertation
Full Text:: . Once I got to Oregon State University, I was fortunate enough to be mentored by Rob and Tuba. You

Technical note: Time lag correction of aquatic eddy covariance data measured in the presence of waves

Creator:: Berg, P., Reimers, Clare E., Rosman, J. H., Huettel, M., Delgard, M. L., Reidenbach, M. A., and Özkan-Haller, H. Tuba
Abstract:: Extracting benthic oxygen fluxes from eddy covariance time series measured in the presence of surface gravity waves requires careful consideration of the temporal alignment of the vertical velocity and the oxygen concentration. Using a model based on linear wave theory and measured eddy covariance data, we show that a substantial...
Resource Type:: Article
Full Text:: ., Delgard, M. L., Reidenbach, M. A., & Özkan-Haller, H. T. (2015). Technical note: Time lag correction of

Technical note: Time lag correction of aquatic eddy covariance data measured in the presence of waves

Creator:: Berg, P., Reimers, Clare E., Rosman, J. H., Huettel, M., Delgard, M. L., Reidenbach, M. A., and Özkan-Haller, H. Tuba
Abstract:: Extracting benthic oxygen fluxes from eddy covariance time series measured in the presence of surface gravity waves requires careful consideration of the temporal alignment of the vertical velocity and the oxygen concentration. Using a model based on linear wave theory and measured eddy covariance data, we show that a substantial...
Resource Type:: Article
Full Text:: ., Delgard, M. L., Reidenbach, M. A., & Özkan-Haller, H. T. (2015). Technical note: Time lag correction of

Development of 2D models to estimate nearshore bathymetry and sediment transport

Creator:: Splinter, Kristen D.
Abstract:: We examine the interactions and feedbacks between bathymetry, waves, currents, and sediment transport. The ﬁrst two pro jects focus on the use of remote sensing techniques to expand our knowledge of the nearshore. Due to the plethora of snap-shot data that is available from satellites and their distribution via Google...
Resource Type:: Dissertation
Full Text:: , 2DH bar variability, a, and wave characteristics (wave height, H, wave period, T , and wave angle, θ

Benthic oxygen consumption rates during hypoxic conditions on the Oregon continental shelf: Evaluation of the eddy correlation method

Creator:: Reimers, Clare E., Özkan-Haller, H. Tuba, Berg, Peter, Devol, Allan, McCann-Grosvenor, Kristina, and Sanders, Rhea D.
Abstract:: Three stations, at ∼80 m water depth on the Oregon shelf between 44.7°N and 43.9 N, were studied under hypoxic conditions in late spring and summer of 2009 to determine benthic oxygen consumption rates. Oxygen fluxes were derived from eddy correlation (EC) measurements made from an autonomous lander deployed for...
Resource Type:: Article
Full Text:: Clare E. Reimers,1 H. Tuba Özkan-Haller,1 Peter Berg,2 Allan Devol,3 Kristina McCann-Grosvenor,1 and

Benthic oxygen consumption rates during hypoxic conditions on the Oregon continental shelf: Evaluation of the eddy correlation method

Creator:: Reimers, Clare E., Özkan-Haller, H. Tuba, Berg, Peter, Devol, Allan, McCann-Grosvenor, Kristina, and Sanders, Rhea D.
Abstract:: Three stations, at similar to ~80 m water depth on the Oregon shelf between 44.7 degrees N and 43.9 N, were studied under hypoxic conditions in late spring and summer of 2009 to determine benthic oxygen consumption rates. Oxygen fluxes were derived from eddy correlation (EC) measurements made from an...
Resource Type:: Article
Full Text:: Clare E. Reimers,1 H. Tuba Özkan-Haller,1 Peter Berg,2 Allan Devol,3 Kristina McCann-Grosvenor,1 and

Wave Energy Converter Modeling in the Frequency Domain : A Design Guide

Creator:: Bosma, Bret, Zhang, Zhe, Brekken, Ted K. A., Özkan-Haller, H. Tuba, McNatt, Cameron, and Yim, Solomon C.
Abstract:: Wave energy converter research continues to advance and new developers are continuing to emerge, leading to the need for a general modeling methodology. This work attempts to outline the design methodology necessary to perform frequency domain analysis on a generic wave energy converter. A two-body point absorber representing a generic...
Resource Type:: Conference Proceeding
Full Text:: : A Design Guide Bret Bosma, Zhe Zhang, Ted K.A. Brekken, H. Tuba Özkan-Haller, Cameron McNatt

Sediment Transport Study: Baseline observations and modeling for the Reedsport wave energy site

Creator:: Özkan-Haller, H. Tuba, Allan, Jonathan C., Barth, Jack A., Haller, Merrick C., Holman, Rob A., Ruggiero, Peter, Oregon State University, and Oregon Department of Geology and Mineral Industries
Abstract:: This project was carried out collaboratively by Oregon State University (OSU) and the Oregon Department of Geology and Mineral Industries (DOGAMI) and involved baseline observations and modeling at the proposed wave energy conversion (WEC) array site near Reedsport, OR. In particular, observations and predictions of the wave conditions at the...
Resource Type:: Technical Report

The wave energy resource of the US Pacific Northwest

Creator:: Lenee-Bluhm, Pukha
Abstract:: The substantial wave energy resource of the US Pacific Northwest (i.e. off the coasts of Washington, Oregon and N. California) is assessed and characterized. Archived spectral records from ten wave measurement buoys, operated and maintained by the National Data Buoy Center and the Coastal Data Information Program, form the basis...
Resource Type:: Masters Thesis
Full Text:: committee members, Dr. H. Tuba Ozkan- Haller, Dr. Solomon Yim, Dr. Joe Zaworski and Dr. Bart Eleveld, for

Hydrodynamic and Morphologic Controls on Extreme Coastal Total Water Levels Across Regional and Local Scales

Creator:: Serafin, Katherine A.
Abstract:: Coastal and estuarine flooding and erosion events are usually driven by the cumulative effect of multiple individual processes like waves, streamflow, storm surge, and/or tides. This dissertation focuses on separating the influence of the regional and local-scale geomorphologic and hydrodynamic processes driving variability in the magnitude and impacts of extreme...
Resource Type:: Dissertation
Full Text:: things coastal. To my committee members Dr. Hilary Stockdon, Dr. Phil Mote, Dr. Tuba Özkan-Haller, and

Deep-sea sediment paleomagnetism : a case study from the North Atlantic

Creator:: Strano, Sarah Elianna
Abstract:: Sedimentary records from the North Atlantic, instrumental in the development of modern paleo-geomagnetic concepts, show a highly variable field even during times of constant polarity. Yet, our understanding of how the magnetization is acquired in the sediments is poorly understood. Primary magnetizations preserved in deep-sea sediments are known to be...
Resource Type:: Dissertation
Full Text:: Ozkan-Haller, Edward Brook, without whom I would not be defending my dissertation today. They are

Ensemble-variational data assimilation for dynamically challenging coastal ocean circulation

Creator:: Pasmans, Ivo
Abstract:: Currently, forecasts produced by the Oregon-Washington (OR-WA) Coastal Ocean Forecast System are constrained by assimilation of only surface observations. The 4-dimensional variational (4DVAR) data assimilation (DA) algorithm is utilized to combine the model and the data, with the time-independent forecast ("background'') error covariance B. In this study, two possible improvements...
Resource Type:: Dissertation
Full Text:: Ozkan-Haller. I am grateful to the college administrative staff for helping out with the neverending

Climate Change Impacts to Estuarine Hydrodynamics: Tools, Methodologies, and Predictions

Creator:: Parker, Kai A.
Abstract:: Coastal communities in the U.S. Pacific Northwest (PNW) are rapidly engaging with the idea that hazards and environmental pressures are changing and may be characteristically different in the near future. This has led to a need for scientific knowledge and tools that can help coastal communities prepare and build resilience...
Resource Type:: Dissertation
Full Text:: development as a researcher. To my other committee members, Tuba Ozkan-Haller, Sarah Emerson, and Emily

Predicting the longshore-variable coastal response to hurricanes

Creator:: Stockdon, Hilary F.
Abstract:: The longshore variability of the coastal response to hurricanes may be examined within the framework of a storm-impact scaling model that compares spatially-variable beach morphology and fluid forcing. The relative elevations of dune height and storm-induced water levels are used to define three impact regimes (swash, collision, and overwash), within...
Resource Type:: Dissertation
Full Text:: Dr. Tuba Ozkan-Haller, an exceptional scientist and role model, for asking the hard questions

Effects of Wave Nonlinearity and Vertical Variation of Vegetation Density on Wave Attenuation

Creator:: Wu, Wei-Cheng
Abstract:: The understanding and prediction how coastal wetland vegetation attenuates wave action has received renewed attention with global climate change impacts and increasing populations on coastlines. Conventional attenuation models utilize empirical drag coefficients, but these coefficients exhibit a wide range of values, and there is some uncertainty in the relative importance...
Resource Type:: Dissertation
Full Text:: Ozkan-Haller, Dr. Peter Ruggiero for providing helpful guidance and supporting the development of my

Data Mining in Food Science Research and Technical Functionality of Wheat Straw-Derived Fibers

Creator:: Karaarslan Urhan, Tuba
Abstract:: This dissertation focused on data mining in food science research and on the technical functional properties of wheat straw-derived biorefinery-byproduct fiber preparations as related to potential applications as food ingredients. This first study evaluated the importance of electronic bibliographic database selection and multiple database usage during the information retrieval phase...
Resource Type:: Dissertation
Full Text:: ANALYSIS Tuba Karaarslan Urhan1, Hannah Gascho Rempel2, Lisbeth Meunier-Goddik1 and Michael H

Laboratory observations and numerical modeling of inner surf and swash zone hydrodynamics on a steep slope

Creator:: Shin, Sungwon
Abstract:: Laboratory data of free surface elevations and fluid velocities were obtained using a laser-Doppler velocimeter for the case of a periodic wave plunging over an impermeable, steep (1:10) slope with a fixed bottom roughness. The measurements were conducted over 15 cross-shore locations from the outer surf zone to the swash...
Resource Type:: Dissertation
Full Text:: and advice. I am thankful to Dr. Solomon Yim, Dr. Memck Haller, Dr. Tuba Ozkan- Hailer, and Dr. Ben

PTIE Findings: Expanding Promotion and Tenure Guidelines to Inclusively Recognize Innovation and Entrepreneurial Impact

Creator:: Carter, Rich G.
Abstract:: Funded through a grant from the National Science Foundation (Award # CNS-1936073), Oregon State University has led a nationwide effort to identify best practices for the inclusive recognition of innovation† & entrepreneurship (I&E) impact within promotion and tenure (P&T) guidelines. The grant PI for this effort is Rich G. Carter....
Resource Type:: Conference Proceeding
Full Text:: Özkan-Haller and Irem Tumer. Additional organizing committee members are Julie Risien and Brian Wall

Wave-current interaction induced by standing long waves in the surf zone

Creator:: Phaksopa, Jitraporn
Abstract:: This dissertation has focused on the charateristics of bubbles generated by breaking waves and the feedback of wave-current interaction on the forcing mechanism of low frequency wave especially basin seiching wave. For the first study, Optical image capture observations of breaking waves in a laboratory surf zone are presented. The...
Resource Type:: Dissertation
Full Text:: like to express my gratitude to Prof. Tuba Özkan- Haller for insightful comments and suggestions for

Calculations for dimensions of flywheel for laboratory motor generator set

Creator:: Haller, Lorain Walter
Resource Type:: Undergraduate Thesis

Depth estimation and frontal imaging via X-band marine radar

Creator:: Honegger, David Andrew
Abstract:: This dissertation focuses on two core aspects of remote sensing: (a) interpretation of the remotely sensed data to identify and characterize sea surface features of interest, and (b) the quantitative analysis of previously characterized features to produce robust estimates of geophysical variables. Specifically, these aspects are addressed in the context...
Resource Type:: Dissertation
Full Text:: thoughtful questions. ¨ I am grateful for the insight gained through conversations with Dr. Tuba Ozkan

An investigation on the modeling of wave field transformation and shoreline morphology near steep bathymetric features

Creator:: Michalsen, David R.
Abstract:: Steep bathymetric anomalies in the beach profile, such as offshore borrow pits, submerged breakwaters, and nearshore canyons can significantly transform the wave climate through the effects of refraction, diffraction, and reflection. When located in the nearshore region the modified wave climate can also substantially change the location of breaking and...
Resource Type:: Masters Thesis
Full Text:: also like to thank Dr. K.D. Suh and Dr. Tuba Ozkan-Haller whose knowledge was a tremendous asset with

A laboratory experiment on sand bar migration with comparisons to recent models

Creator:: Magalen, Jason
Abstract:: Successful prediction of nearshore sediment migration is important in determining the vulnerability of a coastline. During energetic wave climates (storm events) sediment rapidly erodes from beaches and is deposited offshore. In subsequent milder wave conditions, the sediment migrates shoreward, accreting on the beach and helping to protect the coastline. It...
Resource Type:: Masters Thesis
Full Text:: the value of questioning my results. I would like to thank Dr. Tuba Ozkan-HaIler for her

Efficient key management protocols for mobile ad hoc networks

Creator:: Erdem, Özkan M.
Abstract:: In this thesis, novel solutions are proposed for key management issues in mobile ad hoc networks. Presented Hierarchical Binary Tree (HBT) based model is distributed, self-organizing, scalable and does not employ online key distribution authority or group manager. Two different group authentication and group key establishment protocols are proposed for...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Ozkan M. Erdem for the

Microwave scattering from surf zone waves

Creator:: Catalán Mondaca, Patricio A.
Abstract:: Wave breaking in the surf zone is an important forcing mechanism on the generation of nearshore currents and in the driving of sediment transport. At the same time, wave breaking can have significant spatial and temporal variability that needs to be accounted for in the description of nearshore processes. Remote...
Resource Type:: Dissertation
Full Text:: : Microwave Scattering from Surf Zone Waves Abstract approved: Merrick C. Haller Wave breaking in the surf

Wave-by-wave Forecasting of Sea Surface Elevation for WEC Applications Utilizing NARX Neural Networks

Creator:: Gillespie, Alice
Abstract:: Forecasting of ocean waves over a short duration on the order of tens of seconds was approached with the optimization of wave energy conversion in mind. This study outlines the development of an artificial neural network model, specifically the Nonlinear Autoregressive Network with Exogenous Input (NARX), to predict a wave-by-wave...
Resource Type:: Masters Thesis
Full Text:: : ______________________________________________________ Merrick C. Haller Forecasting of ocean waves over a short duration on the order of tens

An Electrolysis Survey of a Small City

Creator:: Haller, Lorain Walter
Abstract:: Following the installation of a street car system, or for that matter, any other electric system, using the ground return, or the rail return which comes in contact with the ground, there is always more or less trouble experienced by water or gas companies, using metal pipe, due to the...
Resource Type:: Undergraduate Thesis
Full Text:: COLLEGE for the degree of BACT-TFLOP OF SCIFNCE in Electrical Engineering by Lorair 1ter Haller

Calibration, characterization, and linear quadratic Gaussian estimation of sensor feedback signals for a novel ocean wave energy linear test bed

Creator:: Haller, Christopher A.
Abstract:: Continual growth of the world's energy consumption and the demand for long-term clean renewable energy resources has led to the development of ocean-based wave energy technologies. Emerging technologies are advancing potential solutions to the complex problem of energy generation in the harsh and corrosive ocean environment. To develop these technologies,...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Christopher A. Haller for

Educational and occupational aspirations of Oregon tenth grade girls

Creator:: Haller, Michele Suzanne
Abstract:: Purposes and Method of Study The purpose of this study was to find out if tenth grade girls were aware of the probability that a majority of them would work at some time during their lives, and if they planned to prepare for this possibility. A questionnaire was designed and...
Resource Type:: Masters Thesis
Full Text:: grade girls AN ABSTRACT OF THE THESIS OF MICHELE SUZANNE HALLER for the MASTER OF SCIENCE (Name

Remote sensing of wave roller lengths in the laboratory

Creator:: Haller, Merrick C. and Catalán, P. A.
Abstract:: The optical intensity signals from surf zone waves in a laboratory flume are analyzed using several different phase‐averaging techniques, and a methodology is developed for estimating wave roller lengths and local wave dissipation. The intensity signals (i.e., phase‐averaged intensity profiles) of individual breaking waves are compared with the wave profiles...
Resource Type:: Article
Full Text:: flume as shown by Haller and Özkan Haller [2007]. Those previous results showed that the standing wave

Hybrid approach to estimating nearshore bathymetry using remote sensing

Creator:: Catalán Mondaca, Patricio A.
Abstract:: The characterization of bathymetry and its time evolution is very important for both oceanographic science applications, and for societal reasons relating to coastal engineering and development. Historically, the process of depth surveying has been costly and labor-intensive. This is especially true in nearshore regions, hence a method that is both...
Resource Type:: Masters Thesis

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:: situ Stratification via Remotely-sensed Internal Wave Speeds Abstract approved: Merrick C. Haller

Remote Sensing of Nearshore Hydrodynamic and Morphodynamic Processes

Creator:: O'Dea, Annika M.
Abstract:: The use of remote sensing techniques in coastal science and engineering has rapidly increased in the past few decades. This dissertation outlines new remote sensing tools using two remote sensing technologies (lidar and X-band marine radar) along with two nearshore hydrodynamic and morphodynamic analyses supported or motivated by these remote...
Resource Type:: Dissertation
Full Text:: of Nearshore Hydrodynamic and Morphodynamic Processes Abstract approved: Merrick C. Haller The use

Radar and Optical Remote Sensing of Submesoscale Frontal Features

Creator:: Simpson, Alexandra J.
Abstract:: The coastal region is home to many types of surface fronts that exist on a submesoscale (1-10 $km$). While in situ observations capture point or transect observations of frontal behavior subsurface, their complex spatial patterns can be well-captured using remote sensing techniques, which provide synoptic views of the ocean surface...
Resource Type:: Dissertation
Full Text:: : Radar and Optical Remote Sensing of Submesoscale Frontal Features Abstract approved: Merrick C. Haller

Sediment Transport Study: Phase Two: Baseline Observations and Characterization of Sediment Transport Processes for the Reedsport Wave Energy Site

Creator:: Ruggiero, Peter, Holman, Robert A., and Allen, Jonathan C.
Abstract:: This project was carried out collaboratively by Oregon State University (OSU) and the Oregon Department of Geology and Mineral Industries (DOGAMI) and involved continuation of the beach monitoring program begun in summer 2009 to determine baseline conditions and beach variability at the site of the planned Reedsport wave energy conversion...
Resource Type:: Technical Report
Full Text:: for the Reedsport Wave Energy Site’ by Ozkan-‐Haller et al. Core

Experimental study of nearshore dynamics on a barred beach with rip channels

Creator:: Haller, Merrick C., Dalrymple, Robert A., and Svendsen, Ib A.
Abstract:: Wave and current measurements are presented from a set of laboratory experiments performed on a fixed barred beach with periodically spaced rip channels using a range of incident wave conditions. The data demonstrate that the presence of gaps in otherwise longshore uniform bars dominates the nearshore circulation system for the...
Resource Type:: Article
Full Text:: ) are shown for completeness; h is the total water depth including wave setup. 14 - 8 HALLER ET AL

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