Energy Content Analysis of Closed Basin Wave Simulation Using Linear and Nonlinear Fourier Analysis

2018 ◽  
Author(s):  
Ali Mohtat ◽  
Solomon C. Yim ◽  
Alfred R. Osborne
Keyword(s):  
Fourier Analysis ◽  
Energy Content ◽  
Wave Train ◽  
Stokes Wave ◽  
State University ◽  
Linear Spectrum ◽  
Wave Basin ◽  
Significant Difference ◽  
Nonlinear Components ◽  
Oregon State University

This study focuses on the computation and analysis of the energy content of a wave train and the influence of nonlinear components, such as nonlinear wave profile as in Stokes wave and phased locked breathers, on the content. To this end, an overview of a state-of-the-art nonlinear Fourier analysis tools for the nonlinear Schrödinger equation is presented. Experimental measurements from a set of performance tests of the directional wave basin at Oregon State University were analyzed using this tool and the energy contents, both from the linear spectrum and nonlinear spectrum, were calculated. The deviation of the energy content from linear analysis and its relationship to the level of nonlinearity of the wave train is investigated. The Benjamin-Feir parameter presents the degree of nonlinearity of the wave train. An increasing energy deviation was observed for increasing nonlinearity of the wave field. Spatial evolution of such behavior is also investigated. It was confirmed that the significant difference from the linear energy is due to increase in the nonlinear components and the more distance the wave train could travel (without substantial dissipation) the more erratic and more significant energy deviations were observed.

The Interaction of Tsunamis With Ocean Swell: An Experimental Study

2011 ◽  
Author(s):  
James M. Kaihatu ◽  
Hoda M. El Safty
Keyword(s):  
Preliminary Analysis ◽  
Tsunami Wave ◽  
Spectral Signature ◽  
State University ◽  
High Frequencies ◽  
Wave Basin ◽  
Significant Difference ◽  
Sloping Beach ◽  
Oregon State University ◽  
Bottom Velocities

Our objective is to investigate the effect of combined swell–tsunami interaction on the nature of the tsunami — in particular the surface elevation, the runup speed and the near-bottom velocities. Laboratory testing in the Tsunami Wave Basin at Oregon State University has been performed to simulate this interaction, with free surface elevations and near-bottom velocities measured at various locations over a plane sloping beach. Random wavetrains with varying initial mean steepness were generated in concert with the tsunami. Preliminary analysis of the data reveals that high steepness ocean swell changes the spectral signature of the tsunami, particularly at high frequencies. There is also a significant difference in location of the breakpoint of the tsunami with overriding swell.

scholarly journals OPTICAL MEASUREMENTS FOR LABORATORY OBSERVATIONS OF TSUNAMI RUN-UP ON CONICAL ISLANDS

2018 ◽  
pp. 65
Author(s):  
Peter Rivera ◽  
Adam Keen ◽  
Patrick J. Lynett
Keyword(s):  
Video Data ◽  
Optical Measurements ◽  
Small Islands ◽  
State University ◽  
Ground Control Points ◽  
Wave Basin ◽  
Wave Research ◽  
Run Up ◽  
Tsunami Run Up ◽  
Oregon State University

Recent studies and observations suggest that small islands near the mainland do not offer protection against tsunamis and may in fact amplify the run-up. The goal of this study was to better understand how the combined effect of small islands and reefs affects tsunamis runup on a planar beach. Optical measurements were carried out to study the run-up characteristics. The study was carried out in the Tsunami Wave Basin at the O.H. Hinsdale Wave Research Laboratory, Oregon State University. Two Panasonic AW-HE60 cameras where used to track run-up on the shore. Through camera calibration we obtain the camera’s parameters which are used to undistort the image and obtain reliable run-up measurements. Using a total station ground control points where collected to rectify the images and obtain ‘real world coordinates’ from the videos. The approach of Rueben et al. (2011) was used to track the wave fronts from the video data.

Experimental Results of Tsunami Bore Forces on Structures

2008 ◽  
Author(s):  
I. N. Robertson ◽  
H. R. Riggs ◽  
A. Mohamed
Keyword(s):  
Experimental Results ◽  
State University ◽  
Velocity Measurements ◽  
Fluid Forces ◽  
Cfd Models ◽  
Wave Basin ◽  
Near Shore ◽  
Series Of Experiments ◽  
Floor System ◽  
Oregon State University

A series of experiments has been carried out at the Tsunami Wave Basin (TWB) at Oregon State University (OSU) to determine the effect of tsunami bores on coastal and near-shore structures, especially buildings and bridges. The TWB is equipped with a piston-type wavemaker capable of generating clean solitary waves. The facility was used to model tsunami bores breaking over coastal reefs and their impact on structural components, including columns, walls, and horizontal members, such as building floors and bridge decks. Detailed wave height and velocity measurements were recorded as well. This paper focuses on the fluid forces of a bore impacting a wall/floor system. The experimental setup will be described and force results will be presented. The experimental results provide needed data to validate CFD models that can then be used to determine forces for a wider variety of situations.

scholarly journals Why Age Matters to Higher Education: Age-Friendly Tools and Techniques for Culture Change

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 551-551
Author(s):  
David Burdick ◽  
Karen Rose ◽  
Dana Bradley
Keyword(s):  
University Presidents ◽  
Steering Committee ◽  
State University ◽  
Community Members ◽  
University Leadership ◽  
Drexel University ◽  
College Of Nursing ◽  
Tools And Techniques ◽  
The University ◽  
Oregon State University

Abstract Momentum is growing for the Age-Friendly University Network as proponents, primarily gerontology educators, have successfully encouraged university presidents to sign nonbinding pledged to become more age-friendly in programs and policies, endorsing 10 Age-Friendly University Principles. While this trend is inspiring, more is needed to fully achieve benefits for universities, students, communities, and older adults. Four presentations discuss innovative ways of deepening university commitment, weaving the principles into the fabric of the university. The first paper describes thematic content analysis from five focus groups with admissions and career services staff at Washington University in St. Louis and the recommendations that emerged for the provision of programs and services for post-traditional students. The second paper describes efforts to utilize community-impact internships and community partnerships to build support for Age-Friendly University initiatives at Central Connecticut State University, particularly in the context of the university’s recent Carnegie Foundation Engaged Campus designation. The third paper describes how Drexel University became Philadelphia’s first Age-Friendly University and current efforts in the Drexel College of Nursing and Heatlh Care Profession’s AgeWell Collaboratory to convene university-wide leadership for an AFU Steering Committee working on four mission-driven efforts to ensure AFU sustainability. The fourth paper describes steps taken by AFU proponents at Western Oregon State University to gain endorsement from university leadership and community, including mapping the 10 AFU Principles to the university’s strategic plan, faculty senate endorsement, and survey/interview results of older community members’ use of the university, which collectively have enhanced deeper and broader campus buy-in of AFU.

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