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MS Plan A Defense: Reliable Acoustic Path Tomography at the ALOHA Cabled Observatory: Continuing studies
Holmes Hall 243 2540 Dole Street, Honolulu, HI, United StatesSitthichat (Boris) Sukpholtham We have investigated the feasibility of Reliable Acoustic Path (RAP) tomography using a mobile ship platform (R/V Kilo Moana) and the existing acoustic infrastructure at the ALOHA Cabled Observatory (ACO). Travel times of acoustic signals traveling along direct paths between the shipboard acoustic source and the bottom-mounted hydrophones were measured. Perturbations of the travel times relative to predicted travel times were obtained, based on the CTD cast closest in time to the experiment date. Stochastic linear inversion was employed to solve for the sound speed perturbation field using the travel time perturbation measurements. This provides a spatially-dependent
Seminar: An Overview of Recent Projects at the Water Research Laboratory (WRL) of the University of New South Wales, Sydney
Watanabe 112 2505 Correa Rd, Honolulu, HI, United StatesDr. François Flocard Principal Engineer Water Research Laboratory University of New South Wales, Sydney, Australia WRL is the largest coastal and hydraulic laboratory in Australia and has been conducting a wide range of research and commercial projects in the last 50 years. This talk will first provide an overview of WRL activities followed by more detailed presentations on 3 different recent research coastal activities: Research and Development on low-carbon coastal protection solutions and how they can be integrated in of breakwater upgrades and remediation in Australia and Pacific Islands; Field measurement and modelling (numerical and physical) of coastal processes in
MS Plan B Defense: Hydroelasticity of the Inflatable Assault Craft during slamming events
Marine Science Building 114 1000 Pope Road, Honolulu, HI, United StatesBradley Beeksma Advanced inflatable structures are an emerging technology in the marine environment. Their growth stems from a demand by the U.S. Navy for rapidly deployable structures such as inflatable boats, inflatable bridges, and launch and recover systems. This novel technology requires considering the interactions between hydrodynamic forces and structural behavior, a study commonly known as fluid–structure interaction (FSI). The ability of numerical tools to model FSI characteristics of inflatables is severely underdeveloped in relevant industries. The present work is an evaluation of an existing, research FSI solver to model an advanced inflatable technology known as drop-stitch fabric. As a
Seminar: Modifying the Seafloor to Study Surf-Zone Dynamics: Breaking Waves, Rip Currents, and Shifting Sandbars
Burns Hall 4005 1601 East-West Road, Honolulu, HI, United StatesDr. Melissa Moulton Research Scientist/Engineer Applied Physics Laboratory University of Washington, Seattle The surf zone is the boundary between land and the open ocean. In the surf zone, ocean waves refract, steepen, and break, driving strong currents and transporting sand, biota, and pollutants along the coast and between land and sea. Improving our knowledge of these processes is important for making better predictions of flooding, erosion, swimmer hazards, and storm impacts on infrastructure and ecosystems. Previous work has used numerical and laboratory models, which may lack important physics, and passive observations in the field, where it is difficult to isolate individual
Seminar: The Fascinating Problem of Harnessing Energy from Ocean Waves
POST 723 1680 East-West Road, Honolulu, HI, United StatesDr. Adi Kurniawan Assistant Professor Department of Civil Engineering, Aalborg University, Denmark Harnessing energy from ocean waves in a cost-effective manner remains one great unsolved problem of our time. While great strides toward solving this problem were made in the 1970s to early 1980s, since then progress has been slow. What have we gained from many years of research into this fascinating subject, and how can we move forward? This talk will give an overview of the history and theory behind ocean wave energy conversion, as well as outline some research directions toward identifying cost-effective solutions to harness wave energy
Seminar: Approaching Residency of Marine Robots for Persistent Underwater Autonomy
Marine Science Building 114 1000 Pope Road, Honolulu, HI, United StatesDr. Zhuoyuan Song Assistant Professor Department of Mechanical Engineering University of Hawai'i, Manoa Persistent subsea exploration and monitoring are of vital significance in many fields including early tsunami warning, oceanography, marine biology, coastal safety, natural resource exploitation, and environmental preservation. An emerging frontier of marine robotics is the endeavor to achieve long-term residency of autonomous underwater vehicles. Supported by subsea infrastructures such as ocean observatories, resident autonomous underwater vehicles (RAUVs) can acquire power and cabled communication from off-shore docking stations. RAUV could provide prolonged dynamic measurements of the subsea environment and attend to emerging remote events promptly. This talk covers
Seminar: Exploring Offshore Marine Structures and Their Complex Dynamics: Current Status and Emerging Future Trends
POST 126 1680 East-West Road, Honolulu, HI, United StatesDr. Ersegun Deniz Gedikli Postdoctoral Fellow, NTNU Norwegian University of Science and Technology Technology, law and world’s appetite for more energy pushed oil-gas and renewable energy source exploration farther from the shores. Recent developments in this search have brought additional design challenges since these large offshore structures are more prone to the harsh environments around them. These factors require innovative approaches, in part because companies cannot operate in conventional ways in the Arctic region and in deep sea. This topic has critical importance to the offshore industry, particularly for the cost-effective development of new ocean structures such as floating offshore
Seminar joint with Oceanography: NOAA, Hydrography, and The Office of Coast Survey
Ensign Airlie Pickett Ensign Harper Umfress NOAA Ship Rainier Hydrography has been around for as long as people have been going to sea. Nautical charts serve as maps for the mariner, identifying shoal areas, wrecks, safe water, reefs, etc. They are the primary source of navigational information for all oceangoing vessels, and support billions of dollars in trade every year. The Office of Coast Survey and NOAA’s fleet of ships and small boats are responsible for the creation and maintenance of the nautical charts within US territorial waters. The science of hydrography has advanced rapidly over the past 100 years.
Seminar: The Push and Pull of Marine Technology
POST 723 1680 East-West Road, Honolulu, HI, United StatesRichard W. (Rick) Spinrad, PhD, CMarSci Professor of Oceans and Atmospheres, Oregon State University President at Marine Technology Society Former Chief Scientist at NOAA The evolution of marine technology is characterized by a balance of “requirements pull” and “capabilities push”. The most obvious driver for scientific/engineering advancement is the need for enhanced performance, in terms of cost, efficiency and safety. To this end, the traditional maritime industries and applications (e.g. oil and gas exploration, commercial fishing, marine transport, etc.) have fostered improvements in a range of areas such as dynamic positioning, acoustic sensors, imaging techniques, and data management. In parallel,
Seminar: NAVATEK: From Science to Application
Sakamaki B101 2530 Dole St, Honolulu, HI, United StatesCharlie Field MS, PE, Mechanical Engineering Navatek, LLC., Honolulu, HI Bradley Beeksma Ocean Engineer Navatek, LLC., Honolulu, HI Navatek is a leading innovation and science-driven small business with experience in modeling, simulation, design, construction, and testing of novel systems. As a growing company of over 130 employees, Navatek has corporate headquarters and a shipyard in Honolulu, and offices in Washington DC, South Kingstown RI, and Portland ME. In collaboration with universities, Department of Defense contractors, and the Office of Naval Research, Navatek excels in transitioning research and design into practical applications. Past and current projects at the company include lifting body
Seminar: Acoustics: From Cavitation to Detection in Clutter
Sakamaki B101 2530 Dole St, Honolulu, HI, United StatesJohn Allen, PhD Associate Professor Department of Mechanical Engineering University of Hawai’i, Mānoa Bubble dynamics and cavitation have had prominent roles in acoustics since Lord Rayleigh's pioneering work noise from ship propellers. Ocean applications are highlighted with respect to ambient noise produced from snapping shrimp off the coast of Hawaii. Snapping shrimp produce sounds by closing an enlarged claw rapidly, creating a cavitation bubble with a water jet. Snapping shrimp sound production has not been previously measured in natural environments with recording levels commensurate with the transient nature of the cavitation bubble sound. Previous field studies have investigated time averaged
Seminar: Investigating Helmholtz Mode for Marine Hydro-Kinetic Energy
Sakamaki B101 2530 Dole St, Honolulu, HI, United StatesReza Ghorbani, PhD Associate Professor Department of Mechanical Engineering University of Hawai'i, Mānoa Short relatively deep tidal basins, which are connected to the open sea by a narrow strait, may exhibit either an amplified (resonant), or damped (choked) response to the tide at the entrance. The sole mode added to this system when the basin communicates with a tidal sea through a narrow strait is the pumping or Helmholtz mode, characterized by a periodic mass exchange through the narrows and associated spatially uniform elevation change within the basin. This is generally also the most energetic mode of such a basin.