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Filtering by: Creator Özkan-Haller, H. Tuba Remove constraint Creator: Özkan-Haller, H. Tuba Degree Field Civil Engineering Remove constraint Degree Field: Civil Engineering

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  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • Amplification of solitary waves along a vertical wall

    Creator:
    Li, Wenwen
    Abstract:
    Reflection of an obliquely incident solitary wave at a vertical wall is studied experimentally in the laboratory wave tank. Precision measurements of water-surface variations are achieved with the aid of laser-induced fluorescent (LIF) technique and detailed temporal and spatial features of the Mach reflection are captured. During the development stage...
    Resource Type:
    Dissertation
    Full Text:
    of Solitary Waves along a Vertical Wall Abstract approved: Harry H. Yeh Reflection of an obliquely

  • Advancing Spatial Data Engineering and Analysis: Integrative Approaches with GIS, Statistical Modelling, and Deep Learning

    Creator:
    Krivova, Maria
    Abstract:
    Geospatial data analysis is a multifaceted discipline encompassing the collection, processing, and visualization of diverse datasets. It models and delineates the interactions of people, objects, and phenomena within geographical spaces and predicts patterns based on the relationships between different locations. Despite significant advancements in geospatial data engineering and analytics over...
    Resource Type:
    Dissertation
    Full Text:
    ______________________________________________________________________________ Merrick C. Haller Geospatial data analysis is a multifaceted discipline encompassing

  • Evaluation of Stereoscopic Camera Systems for Non-Intrusive Spatial Free Surface Measurement in Coastal Research Laboratories

    Creator:
    O'Day, Christopher S.
    Abstract:
    Physical modelling is instrumental to the progression of coastal engineering research and our understanding of the offshore and nearshore environments. Scaled models are designed and built to be tested in coastal research laboratories, where a wave basin or flume generates the desired wave conditions for experimentation. The surrounding hydrodynamics of...
    Resource Type:
    Masters Thesis
    Full Text:
    ............................................................................................................... 87 6.1.1 Shore Normal (H = 0.5 m, T = 1.8 s, θ = 0 deg, h= 1m

  • Hydrodynamic loads on fiber-optic micro cables

    Creator:
    Evans, Matthew R.
    Abstract:
    A Finite Element Model of a deployed Fiber-Optic Micro Cable (FOMC) was performed using the marine cable modeling software, OrcaFlex. The focus of this study was a parametric analysis of a two-part, towed cable array with the FOMC dragged behind a depressor and connected to a drogue chute. Length-to-diameter ratios...
    Resource Type:
    Capstone Project
    Full Text:
    opportunities and needs. My committee members, Dr. Dan Cox and Dr. Merrick Haller, not only supported this

  • A procedure to identify and evaluate forest arterial and collector road networks

    Creator:
    Kehr, Richard H.
    Abstract:
    This thesis presents a procedure to identify and evaluate forest arterial and collector networks. The procedure identifies those decision criteria important in evaluating both the arterial and collector networks and the specific facilities identified on these networks. The procedure incorporates the decision criteria and results from network and facility analysis...
    Resource Type:
    Masters Thesis
    Full Text:
    Kehr, Richard H. AN ABSTRACT OF THE THESIS OF Richard

  • On Undular Bores and Solitary Waves in Variable Depth

    Creator:
    Knowles, Jeffrey N.
    Abstract:
    Numerical results are presented using a higher-order pseudo-spectral method in order to solve the Zakharov-Craig-Sulem formulation of the Euler model. We study the effects of variable bathymetry on weakly-dispersive, weakly-nonlinear, shallow water waves. Improved predictions on wave amplitude and shoaling behavior are developed by analytical means in the context of...
    Resource Type:
    Dissertation
    Full Text:
    and Solitary Waves in Variable Depth Abstract approved: Harry H. Yeh Numerical experiments were

  • Contact and impact dynamic modeling capabilities of LS-DYNA for fluid-structure interaction problems

    Creator:
    Challa, Ravi
    Abstract:
    Fluid-structure interaction (FSI) is a very interesting and challenging multi-disciplinary field involving interaction of a movable or deformable structure with an internal or surrounding fluid flow. FSI plays a pivotal role in many different types of real-world situations and practical engineering applications involving large structural deformation and material or geometric...
    Resource Type:
    Masters Thesis
    Full Text:
    thankful to Prof. Harry Yeh and Prof. Merrick Haller for imparting the basic principles in ocean

  • Wave Resource Assessments: Spacio-Temporal Effect of Wave Energy Converter Scale and Blue Economy Opportunities

    Creator:
    Dunkle, Gabrielle R.
    Abstract:
    Wave energy has the potential to power large and small factions of economies around the world alike. Current methods for determining the amount of wave energy resource available to wave energy converter (WEC) devices entail capturing the look of the sea state at large by presenting characteristic wave heights, periods,...
    Resource Type:
    Masters Thesis
    Full Text:
    thank my committee members Dr. Meagan Wengrove, Dr. Merrick Haller, and Dr. Edward Dever for their

  • Morphodynamic Evolution of Coastal Oregon: Using New Lidar-derived Beach and Sand Dune Morphometrics to Explore Multi-decadal Change

    Creator:
    Light, Jacob W
    Abstract:
    The coast of Oregon is highly dynamic, with beach and dune morphodynamics constantly evolving in response to physical and ecological forcing at scales ranging from seconds to decades and meters to tens of kilometers. Evaluating spatial and temporal trends in shoreline evolution is paramount in understanding and eventually developing a...
    Resource Type:
    Masters Thesis
    Full Text:
    committee members Dr. Merrick Haller, Dr. Meagan Wengrove, and Dr. Rick Colwell for their support and

  • Application of Motion Capture Technologies to Assess the Free Surface and Track Waterborne Debris in Wave Research Laboratories

    Creator:
    Shultz, Jamie
    Abstract:
    In coastal and ocean engineering, understanding the ocean environment and the forces from waves, tsunamis and waterborne debris on structures and floating bodies is an important aspect of designing safe and effective infrastructure. Understanding the impact of these forces on structures becomes an important question in the design process. Answering...
    Resource Type:
    Masters Thesis
    Full Text:
    A and B value, the wave height calculated from the B value, and kh and h calculated from this wave

  • Light-frame versus timber frame : a study in quantifying the differences

    Creator:
    Malone, Brian P.
    Abstract:
    The objective of this study was to compare light wood framing and traditional timber framing quantitatively through environmental impact assessment and load path analysis. This research was inspired by a traditional timber frame structure constructed in Vermont in 2011, and the design of structures considered within reflect the general characteristics...
    Resource Type:
    Masters Thesis
    Full Text:
    in Quantifying the Differences Abstract approved: Rakesh Gupta Thomas H. Miller The

  • Structural Response of High-Performance Fiber-Reinforced Cementitious Composites: Evaluation, Simulation, and Sensitivity Analysis

    Creator:
    Khlef, Feras L.
    Abstract:
    The constitutive behavior of high-performance fiber-reinforced cementitious composites (HPFRCCs) under mechanical loading is characterized by significant tensile properties that play an essential role in the structural response of several applications in structural engineering. The significance of tensile properties of HPFRCCs in structural engineering is the focus of three manuscripts presented...
    Resource Type:
    Dissertation
    Full Text:
    : ____________________________________________________________________ Andre R. Barbosa Jason H. Ideker The

  • Effect of an Idealized Mangrove Forest of Moderate Cross-shore Width on Loads Measured on a Sheltered Structure and Comparison with Predicted Forces

    Creator:
    Mitchell, William T.
    Abstract:
    As coastal communities face increasing chronic and acute hazards, nature-based coastal engineering solutions have experienced a rapid growth in popularity and interest. Recent works on this topic have shown that “Green Infrastructure” may be effective at mitigating coastal hazards and therefore provide sustainable adaptation alternatives to traditional engineering solutions such...
    Resource Type:
    Masters Thesis
    Full Text:
    encouraging me to present the work as a thesis  Merrick Haller for serving on my committee, providing

  • Mapping Nearshore Bathymetry with Spaceborne Data Fusion and State Space Modeling

    Creator:
    Forfinski-Sarkozi, Nicholas A.
    Abstract:
    Despite numerous techniques for measuring and estimating water depth, bathymetry in the nearshore zone is notoriously difficult to map. Dangerous sea states, noisy environmental conditions, and expensive survey operations, particularly in remote areas, contribute to the difficulties of obtaining data along the coast. Global datasets, derived mainly from satellite altimetry...
    Resource Type:
    Dissertation
    Full Text:
    mentor. I would also like to thank my committee members, Dr. Michael Olsen, Dr. Merrick Haller, Dr

  • Radiometric Calibration of EAARL‐B Bathymetric Lidar Data

    Creator:
    Wilson, Nicholas C.
    Abstract:
    The Experimental Advanced Airborne Research Lidar ‐ B (EAARL‐B), which was built and deployed by the U.S. Geological Survey (USGS) in 2014, is a novel topographic‐bathymetric lidar system. While retaining a number of features that were pioneered in the original National Aeronautics and Space Administration (NASA) EAARL system (e.g., low...
    Resource Type:
    Masters Thesis
    Full Text:
     also like to thank my committee members Michael Olsen, Merrick Haller and Jamon Van Den  Hoek for

  • Roundabout Safety: Econometric and Machine Learning Models and Applications

    Creator:
    Zubaidi, Hamsa AN
    Abstract:
    The rapid growth in the number of roundabouts raises some significant research challenges, especially around safety performance and evaluation in the U.S. Despite the safety advantages that roundabout geometric design brings, crashes still occur. While operationally roundabouts are good at preventing severe crashes, they may lead to more less severe...
    Resource Type:
    Dissertation
    Full Text:
    , Dr. David S. Hurwitz, Dr. Katharine H. Zaworski, and Dr.Yue Zhang, for their support, valuable

  • Critical Assessment of Chloride States and Quantities in Ordinary Portland and Specialty Cements

    Creator:
    Ahmed, Ahmed Abdulhaq
    Abstract:
    The constituent materials of concrete often contain chlorides. The presence of chlorides in sufficient amounts can disrupt the passive layer, also known as the passive film, that protects the reinforcing steel in concrete. This disruption can lead to premature corrosion of the reinforcing steel in concrete. To minimize the risk...
    Resource Type:
    Dissertation
    Full Text:
    Haller for all of the help and support. You are a person that I feel to be lucky to know and to work

  • Probabilistic Multi-hazard Earthquake-Tsunami Structural Risk Assessment Framework

    Creator:
    Alam, Mohammad Shafiqual
    Abstract:
    Catastrophic earthquake and tsunami events that resulted in significant loss of life and property over the past two decades have raised the global awareness regarding the need to understand the response of communities and their built environment to multi-hazard extreme events. In recognition to this impending threat to the coastal...
    Resource Type:
    Dissertation
    Full Text:
    journal publication with the following complete reference: “Alam, M. S., Barbosa, A. R., Scott, M. H

  • Probabilistic Tsunami Hazard and Damage Assessment of the Built Environment : Applied at Seaside, Oregon

    Creator:
    Park, Hyoungsu
    Abstract:
    Damage estimates to the built environment from tsunamis are important for disaster mitigation, including planning emergency response and recovery. This dissertation evaluates the damage states of buildings in a small urban coastal city, Seaside, Oregon, from tsunami hazards generated by a Cascadia Subduction Zone (CSZ) event. This study is separated...
    Resource Type:
    Dissertation
    Full Text:
    College of Earth, Ocean and Atmospheric Sciences: Dr. Merrick Haller, Dr. Tuba Ozkan-Haller, Dr. Peter

  • Munition Mobility in Mixed Grain (Sand and Cobble) Environments

    Creator:
    Paskoski, Jessica
    Abstract:
    Nearly 24% of Formerly Used Defense Sites (FUDS) containing military munitions are in the nearshore coastal zone with approximately 30% of those sites containing heterogeneous sediment compositions of gravel-sand. Previous exploration in munition mobility was performed on beaches of sandy or muddy bottoms leaving the influence of heterogeneous sediment properties...
    Resource Type:
    Masters Thesis
    Full Text:
    Station Sensors (H#) and Buried (B#) Sensors . 119 1 Introduction Underwater munitions are exposed to

  • The effect of a variable draft tube flow area on the performance of a reaction turbine

    Creator:
    Ray, Arliss Dean
    Resource Type:
    Masters Thesis
    Full Text:
    acknowledgment. In particular, gratitude is expreased toward H. G. Barnett, Head or the Depal'tment of

  • Root Cause Analysis of Transportation Infrastructure Accidents Using Fault Trees

    Creator:
    Yang, Rebecca
    Abstract:
    The Bureau of Labor Statistics cites construction as the most hazardous industry within the United States. The construction industry was responsible for 20% of all fatal occupational injuries in 2014. Approximately 20% of the construction injuries occur within Heavy Civil Engineering, in which there are 950,000 workers employed annually. This...
    Resource Type:
    Masters Thesis

  • Multi-hazard Damage and Loss Assessment of Bridge Networks

    Creator:
    Burns, Patrick O.
    Abstract:
    The overarching objective of this study is to examine and compare the vulnerabilities of bridges combining effects of earthquake-induced ground shaking, ground failure (e.g., landslides and lateral spreading), and tsunami inundation. A parametric study is performed to understand the sensitivity of economic loss and traffic capacity with respect to the...
    Resource Type:
    Masters Thesis
    Full Text:
    , (h) M8.7 CSZ, and (i) M9.0 CSZ. ................................. 13   Figure 3-3: Year of

  • The Art of Reducing Coastal Hazard Complexity: Coupling Physics and Probability to Understand Extremes, Variability, and Climate-dependence

    Creator:
    Anderson, Dylan L.
    Abstract:
    Coastal hazards are the result of numerous physical processes cumulatively causing water levels to flood and erode the land. The waves, storm surges, tides, and run-off contributing to elevated water levels are each the product of chaotic and random weather patterns. These stochastic weather patterns dissipate energy in Earth's climate...
    Resource Type:
    Dissertation
    Full Text:
    SEA waves. h) peak period from the combined wave spectrum. i) the resul- tant compound TWL as defined

  • Probabilistic Geospatial Analyses, Uncertainty Modeling, and Mapping of Seismically-induced Ground Failures

    Creator:
    Sharifi Mood, Mahyar
    Abstract:
    Ground failures, in particular landsliding, liquefaction and lateral spreading can be triggered by seismic sources. The frequency, magnitude, and impact of these ground failures are highly dependent on the topography and geology of the site including its slope, depositional environment, and geotechnical properties as well as the proximity of the...
    Resource Type:
    Dissertation

  • Knowing Concepts in the Social and Material Context of Engineering Practice

    Creator:
    Bornasal, Floraliza
    Abstract:
    It is expected that information taught in the context of school will ultimately transfer to workplace settings. To support this transition, educators and researchers advocate for organizing foundational ideas, or concepts, in specific domains of knowing. In the domain of transportation engineering, knowing of concepts, which include "big ideas" such...
    Resource Type:
    Dissertation

  • Ground Improvement and Liquefaction Mitigation using Driven Timber Piles

    Creator:
    Gianella, Tygh N.
    Abstract:
    Seismically-induced liquefaction represents a major cause of damage to civil infrastructure and can result in significant damage following major earthquakes. Liquefaction can occur when earthquake ground motions raise pore-water pressures in loose, sandy soil, resulting in a substantial decrease of soil strength. Owing to the potential for instability following liquefaction,...
    Resource Type:
    Masters Thesis