M.S. - Ocean and Resources Engineering

Permanent URI for this collection

Browse

Recent Submissions

Now showing 1 - 10 of 28
  • Item
    SEASONAL WAVE CLIMATE ANOMALIES ON THE NORTH SHORE INDICATIVE OF EROSION CONDITIONS
    ( 2022) Storey, Andrew ; Stopa, Justin E. ; Ocean & Resources Engineering
  • Item
    DETECTING SPINNER DOLPHIN (STENELLA LONGIROSTRIS) CLICKS IN NOISY AND LOW SAMPLING RATE HYDROPHONE RECORDINGS
    ( 2021) Manabe, Kei ; Nosal, Eva-Marie ; Ocean & Resources Engineering
  • Item
    MORPHODYNAMIC CHANGES DUE TO CALM/MODERATE WAVE FORCING: A CASE STUDY OF WAIKĪKĪ BEACH
    ( 2021) Kalksma, Julianne ; Stopa, Justin E. ; Fletcher, Charles H. ; Ocean & Resources Engineering
  • Item
    A FATIGUE ANALYSIS OF THE NO-WEC MOORING SYSTEM AT THE U.S. NAVY WAVE ENERGY TEST SITE OFF O‘AHU, HAWAI‘I
    ( 2020) Morrow, Cameron Sean ; Huang, Zhenhua ; Ocean & Resources Engineering
  • Item
    RELATIONSHIPS BETWEEN TSUNAMI SIZE AND EARTHQUAKE MAGNITUDE IMPROVED BY FAULT PARAMETERS
    ( 2020) Sun, Lin ; Cheung, Kwok Fai ; Ocean & Resources Engineering
  • Item
    UNCERTAINTIES OF MULTI-DECADAL BUOY AND ALTIMETER OBSERVATIONS
    ( 2020) Leyva, David James ; Stopa, Justin E. ; Ocean & Resources Engineering
  • Item
    MAPPING THE OCEAN SOUND SPEED AT THE ALOHA CABLED OBSERVATORY USING RELIABLE ACOUSTIC PATH TOMOGRAPHY
    ( 2019) Sukpholtham, Sitthichat ; Howe, Bruce ; Ocean & Resources Engineering
  • Item
    Reliable Acoustic Path (RAP) Tomography at the ALOHA Cabled Observatory.
    ( 2017-12) Varamo, Vincent J. ; Ocean & Resources Engineering
  • Item
    Bottom-Discontinuous Riemann Solver for Modeling of Wave Overtopping
    ([Honolulu] : [University of Hawaii at Manoa], [August 2015], 2015-08) Wesley, Matthew
    Depth-integrated numerical models represent an adequate and efficient method to describe near-shore processes including wave breaking. A limitation to these models is encountered as a wave overtops a vertical breakwater. The vertical flow structure cannot be recreated, leading to inaccurate results or numerical instabilities. The Riemann solver containing a bottom discontinuity presented by Murillo and Garcia-Navarro (2010; 2012, Journal of Computational Physics) may alleviate this limitation. In this study, a review of the Riemann solver and its incorporation into a one-dimensional second-order MUSCL-Hancock scheme are presented. The first series of validation tests mimics the Riemann problem with an emphasis on overtopping over a bottom discontinuity. The model results give good overall agreement to those from OpenFOAM (an open-source computational fluid dynamics code), but show underestimation of the downstream propagation speed when free fall of water is involved. A laboratory experiment was conducted in a 9.14 m long flume to provide validation data for solitary wave overtopping of a vertical breakwater. The numerical model shows slightly more reflection from the breakwater and underestimates the overtopping volume. Despite the discrepancies, the bottom-discontinuous Riemann solver performs reasonably well in approximating the overall processes given the simplicity of its formulation.
  • Item
    In-ocean experiments of a wave energy conversion device with a drogue and wave power calculations
    ([Honolulu] : [University of Hawaii at Manoa], [August 2013], 2013-08) Nolte, Jerica Dawn
    This research describes the experimental and numerical modeling of a heaving point source wave energy conversion (WEC) device developed by Trex Enterprises of Maui and tested by the University of Hawaii at Manoa. The principle of operation of the WEC device is to convert the vertical heave displacement into a rotational action, which generates electrical power. The heave displacement is created by the WEC system riding incoming waves relative to an anchoring system. Two deployment cases of the single WEC device were ocean tested with the goal of collecting power data based on the type of the anchoring method. The anchoring methods are referred to as the single-body case (moored system) and double-body case (drogue anchored system). The experiments were carried out on the South shore of Oahu during the summer of 2012. The WEC system was equipped with sensors to measure and record the heave displacements of the WEC system, the generated power output, and the surface elevation. The real time experimental data were collected and analyzed to determine the power generation profile, the WEC system's heave displacements, surface elevation, and heave response amplitude operator (RAO) for both cases. A numerical modeling program was built to perform hydrodynamic analysis in the time domain in irregular seas for the single-body or double-body case. The program solves for the individual body motion. It is used to predict the WEC device's power production over the time series.