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Seminar – Philomene Verlaan
Holmes Hall 400A Discussion of Recent Developments in Marine Minerals Deep-sea mining has seen several “false dawns” since this marine industrial activity emerged in the 1960s. This is because it presents particularly complex challenges due to its multi-faceted and interdependent technological, scientific, environmental, social, industrial, political, economic and legal aspects, all of which must be efficiently managed at both international and national governmental levels to achieve commercially viable results. Recent developments in addressing these challenges for the currently most commercially attractive deep-sea hard mineral resource, the polymetallic nodules found under international waters in the Clarion-Clipperton Zone of the North Pacific Ocean, southeast
Seminar: Numerical Modeling of Flood Hazards from Tsunamis and Hurricanes
Marine Science Building 114 1000 Pope Road, Honolulu, HI, United StatesYoshiki Yamazaki, Ph.D. Post-doctoral Research Fellow Department of Ocean and Resources Engineering The low-lying coastal communities of Hawaii are vulnerable to flooding from tsunamis and hurricanes. In particular, Hawaii was hit by six destructive tsunamis generated by subduction earthquakes during the last 100 years. Accurate prediction of tsunami impacts is crucial for mitigation planning and emergency response. We have developed the shock-capturing, dispersive wave model, NEOWAVE (Non-hydrostatic Evolution of Ocean WAVEs), which includes a two-way nesting scheme of telescopic grids to describe tsunami generation, propagation, and inundation in a single computation. The main motivation for the development is to have
Seminar: A wave-flume study of scour at a pile breakwater: solitary waves
Marine Science Building 114 1000 Pope Road, Honolulu, HI, United StatesConghao Xu Recipient of the ORE Outstanding Student Award, University of Hawai’i Understanding the sediment transport and the resulting scour around coastal structures such as piles under local extreme conditions is important for the stability of foundations of various coastal structures. As a part of combined experimental and multi-phase numerical study of scour around coastal pile structures, this study reports a waveflume experiment investigating the scour at a pile breakwater, which consists of a row of closely spaced piles. Solitary waves were considered in this study. A simple procedure in the experiment was introduced to eliminate possible multiple reflection of
Seminar: Global OTEC Resources
Marine Science Building 114 1000 Pope Road, Honolulu, HI, United StatesGérard C. Nihous, Ph.D. Associate Professor Department of Ocean and Resources Engineering School of Ocean and Earth Science and Technology, University of Hawai‘i Ocean Thermal Energy Conversion (OTEC) relies on the thermal stratification of the water column in tropical oceans to drive a heat engine. OTEC technologies require large seawater flow rates since temperature differences from different water depths are relatively small. This raises a number of questions, for example, whether global OTEC resources are limited, and what large-scale environmental effects might occur. Attempts to address such issues, for more than a decade, are summarized, from one-dimensional analyses of the
Seminar: Application of mixed Eulerian-Lagrangian method in nonlinear wave-structure interactions
Marine Science Building 114 1000 Pope Road, Honolulu, HI, United StatesDr. Chunrong Liu Professor, Xiamen University of Technology (XMUT), China Mixed Eulerian-Lagrangian methods solve water wave problems by tracking the moving boundaries using Lagrangian method and obtaining the flow field using Eulerian method. One advantage of this type of methods is its ability to deal with highly nonlinear water waves. In this talk, a numerical implementation of mixed Eulerian-Lagrangian methods is used to develop a 2D numerical wave tank for studying wave-structure interactions. The numerical wave tank is used to investigate two problems: (1) nonlinear wave scattering by fixed horizontal plate and (2) wave transmission through a submerged heaving plate.
MS Plan B presentation: Resonance patterns along the US west coast from the 2011 Tohoku tsunami
Ryan Braman The 2011 Tohoku earthquake devastated northeast Japan and caused damage and loss of life as far away as the Americas coasts. The pattern of the impact along the US west coast closely resembles those in previous tsunamis originated from different locations. This study seeks to understand the mechanism behind the impact through analysis of non-hydrostatic model results for the tsunami’s propagation across the Pacific and wave action over continental shelves . Recorded data from 13 tide gauges were selected from Washington to California and compared against the computed water surface elevation for model validation. A fast Fourier transform
PhD Defense: Extratropical storm-generated swell induced vulnerability effects on the tropical islands of Hawai‘i
POST 723 1680 East-West Road, Honolulu, HI, United StatesYaprak Onat The poleward shift of strong extratropical storms due to the change in the baroclinicity raises the question of how the storm intensification affects the susceptibility of distant remote islands under high wave energy environments. This study aims to identify the effective linkages between the intensification of extratropical storms and the corresponding swells in order to reduce the uncertainty in prioritizing vulnerable coastal systems in Hawai‘i. The minimum mean sea level pressure and geopotential height, and maximum vorticity are used as a criteria to define strong cyclonic activity from stationary points from an atmospheric reanalysis dataset to hindcast swell
PhD Defense: Numerical dispersion in non-hydrostatic modeling of long-wave propagation
POST 601 1680 East West Road, Honolulu, HI, United StatesLinyan Li Numerical discretization with a finite-difference scheme is known to introduce truncation errors in the form of frequency dispersion in depth-integrated models commonly used in tsunami research and hazard mapping. While prior studies on numerical dispersion have focused on the shallow-water equations, we include the depth-integrated non-hydrostatic pressure and vertical velocity through a Keller-box scheme and investigate the properties of the resulting system. Fourier analysis of the discretized governing equations gives rise to a dispersion relation in terms of the time step, grid size, and wave direction. The interworking of the dispersion relation is elucidated by its lead-order approximation,