Physical Sciences and Mathematics Commons^™

Ocean Waves Workshop 2019 Session 4 Notes, Kaus Raghukumar, Sam Mcwilliams

Ocean Waves Workshop

No abstract provided.

Deficiencies In The Physics Of Existing Operational Wave And Surge Models, D. T. Resio

Ocean Waves Workshop

No abstract provided.

A New Real-Time Ocean Observing Station On Ship Shoal On Louisiana Shelf, Chunyan Li, Peter Luo, Brian Milan, Wei Huang

Ocean Waves Workshop

One of the major challenges that we are facing in the northern Gulf of Mexico coastal area is the need of a better and reliable offshore met-ocean real time data collection system that supports the mission of Bureau of Ocean Energy Management (BOEM) and other federal and local agencies for coastal management, protection, and restoration, especially along the Louisiana coast. This area has a suite of environmental problems that require the acquisition of real time data for immediate assessment or model-based assessment and predictions that rely on this kind of data. One such system providing this kind of data is …

Ocean Waves Workshop 2019 Session 3 Notes, Kaus Raghukumar, Sam Mcwilliams

Ocean Waves Workshop

No abstract provided.

Update In Us Navy Global Wave Model Forecasting, J. D. Dykes, W. E. Rogers, D. Wang

Ocean Waves Workshop

No abstract provided.

Ocean Waves Workshop 2019 Session 2 Notes, Kaus Raghukumar, Sam Mcwilliams

Ocean Waves Workshop

No abstract provided.

Directional Spectrum Measurements By The Spotter: A New Developed Wave Buoy, Kaus Raghukumar, Grace Chang, Frank Spada, Tim Jannsen

Ocean Waves Workshop

The Spotter is an accurate, low-cost, easily deployable and robust solar powered wave buoy recently developed by Sofar Technologies (formerly Spoondrift). Spotter reduces costs and complexity of surface wave and current measurements, which can be useful for academic, military, and commercial research into surface wave and wave-driven dynamics. We performed a series of validation tests and research experiments with the Spoondrift Spotter. The low-cost and compact Spotter makes it easy to deploy arrays of wave buoys which was previously not feasible (or cost prohibitive) with traditional wave buoys. A well-designed array can provide a direct measurement of the directional wave …

Ocean Waves Workshop 2019 Session 1 Notes, Kaus Raghukumar, Sam Mcwilliams

Ocean Waves Workshop

No abstract provided.

Innovations In Metocean Sensors, Pieter Smit, T. T. Janssen

Ocean Waves Workshop

Real-time observations are critical to understand, predict and estimate the impact of extreme weather events such as extratropical hurricanes and storms. Remote sensing, moored wave buoys and advances in predictive models have greatly advanced understanding and predictive capability of extreme ocean weather. However, due to cost and complexity of traditional moored buoys, in-situ networks are typically sparse and often close to shore and not well suited to drive predictive models over meaningful geophysical scales. Here we will discuss ongoing efforts to extend the capability of the Sofar Spotter to measure marine boundary layer dynamics. With the advancement to more portable …

Session 4 Discussion Notes, Ocean Waves Workshop 2017

Ocean Waves Workshop

No abstract provided.

Overview Of Open Source Codes To Assess Environmental Effects On Ocean Wave Farms, Chris Chartrand, Kelley Ruehl, Jesse Roberts, Sam Mcwilliams, Kaus Raghukumar, Aaron Porter, Cameron Mcnatt

Ocean Waves Workshop

The development of SNL-SWAN by Sandia National Laboratories (SNL) allows users to investigate the interaction between a WEC or WEC array and the wave environment. SNL-SWAN when coupled with a hydrodynamic and sediment transport model such as Delft3D, developed by Deltares Inc, allows for the direct investigation of WEC array effects on the physical environment (e.g. waves, currents, seabed) and the associated site ecology. Ongoing development of these tools has shown how the coupling of SNL-SWAN with Delft3D-Flow can quantify the interaction between device(s) and the hydrodynamic environment at a real-world site.

Wave-Measuring Performance Characteristics Of Spoondrift Spotter, K. Raghukumar, G. Chang, F. Spada, C. Jones, W. Gans, T. Janssen

Ocean Waves Workshop

Spoondrift Spotter represents a state-of-the-art wave measurement buoy developed by Spoondrift (www.spoondrift.co) and supported by funding from the Advanced Research Projects Agency – Energy (ARPA-E). A low-cost buoy platform like Spotter enables a range of new applications. For instance, coherent arrays of Spotters can support adaptive tuning of marine and hydrokinetic energy devices. In general, the availability of high-fidelity wave measurements can help support wave assessments for a variety of commercial, military, operational, academic, and recreational users.

Wave Energy Converter Effects On The Nearshore Environment, Grace Chang, Craig Jones, Jason Magalen, Jesse Roberts

Ocean Waves Workshop

This poster presents efforts to use predictive modeling tools to evaluate the impacts of Wave Energy Converter (WEC) arrays on nearshore processes, investigate effects of different WEC devices on wave propagation, examine wave propagation in the lee of a WEC array over different wave conditions, and accelerate the realization of commercial-scale wave power.

Session 4 Presentation - Improved Coastal And Nearshore Wave Forecasting, Jeffrey Hanson, Robert Fratantonio

Ocean Waves Workshop

Accurate nearshore and coastal wave forecasts are essential for the protection of life and property as well as enhancing the economy through safe and efficient commercial activities. Modeling the nearshore environment has remained both computationally intensive and challenging due to the strong interaction of waves with the ocean bottom in shallow water environments. Here we develop a new wave system approach for nearshore wave modeling that addresses these issues. Wave systems result from specific wind forcing events on the ocean surface. This approach extends earlier work on wave system partitioning and tracking to assimilate coastal buoy observations into model output …

Session 3 Discussion Notes, Ocean Waves Workshop 2017

Ocean Waves Workshop

No abstract provided.

Real-Time Wave Assimilation Using Low-Cost Sensor Arrays (Extended Abstract), Pieter Smit, Tim Janssen, Cameron Dunning, Wheeler Grans

Ocean Waves Workshop

In this paper we present the underlying theory and principal results from a new real-time data-assimilation system in which we integrate a dense network of Spotters. The sensor network was deployed as part of the ONR Innershelf DRI experiment during the period from September 2017 till November 2017. The array consists of 18 Spotters, deployed seaward of Point Sal (California) along the 20-, 50- and 100-meter depth contours (Fig. 1). Each of these buoys provides estimates of the complete frequency-directional spectrum every hour. The wave spectra and directional moments are assimilated in real-time using an efficient backward raytracing algorithm to …

Session 3 Presentation - An Overview Of Recent Wave Glider® Field Program, Pat Fitzpatrick, Yee Lau, Robert Moorhead, Adam Skarke, Daniel Merritt, Keith Kreider, Chris Brown, Ryan Carlon, Graham Hine, Teri Lampoudi, Alan Leonardi

Ocean Waves Workshop

Developed by Liquid Robotics, Inc., Wave Gliders® (WGs) use wave energy for propulsion through the synergistic alternating thrust of wave action on the floating vehicle and mechanical wings 6 m below the vehicle. WGs provide dynamic environmental monitoring in the maritime environment with weeks-tomonths-long deployments using solar panels to power sensors, and satellite and cell communication channels for data delivery. Some data is transmitted real-time or in bulk at more infrequent intervals, while other data is archived on-board for extraction after a mission.

Example field programs include: wave, ocean, and PBL measurements in tropical cyclones; algae bloom monitoring; satellite ground …

Session 2 Discussion Notes, Ocean Waves Workshop 2017

Ocean Waves Workshop

No abstract provided.

Overview Of Open Source Codes To Assess Environmental Effects Of Ocean Wave Farms (Extended Abstract), Chris Chartrand, Kelley Ruehl, Jesse Roberts, Aaron Porter, Cameron Mcnatt

Ocean Waves Workshop

The United States has a theoretical ocean wave energy resource potential of 1,594–2,640 TWh/year, enough to power between 143.5 and 237.6 million homes/year and contribute substantially to the United States’ energy portfolio [1]. However, wave energy converters (WECs) are currently in the early stages of research and development at low technology readiness levels. Open ocean deployment data is from demonstration-scale projects, not from utility-scale deployments. As a result, researchers, developers, and regulators rely heavily on numerical models to understand the environmental effects of wave farms.

Preliminary numerical studies have demonstrated that small-scale deployments of ~10 WECs or less have little …

Session 2 Presentation - A New Generation Of Spectral Wave Models, Don Resio, Dorukan Ardag, C. Reid Nichols

Ocean Waves Workshop

Over the last decade, considerable effort has been spent on the evaluation of operational wave models such as the WAM, WAVEWATCH III, and SWAN thirdgeneration (3G) model. Most recent effort has focused on a “wholistic” approach to model evaluation, rather than on related comparisons directly to physics-based processes. In such an approach, model coefficients are tuned to maximize the global fit to integrated wave parameters such as wave height, mean/peak period, mean direction and directional spreading [1]. However, these coefficients do not ensure a universal “best-fit” to observation. Also, comparisons to spectra are omitted from the model evaluations since they …

Session 1 Discussion Notes, Ocean Waves Workshop 2017

Ocean Waves Workshop

No abstract provided.

Session 1 Paper - Contemporary Expeditionary Warfare For Scientists And Engineers, C. Reid Nichols

Ocean Waves Workshop

Expeditionary forces from many countries have deployed to mitigate the effects of natural disasters and human conflicts. Approaches are usually linked to the nation’s maritime strategy. Expeditionary forces provide rapid response to man-made disruptions such as mass casualties by terrorists, vessel hijackings by pirates, murders by drug cartels, and nuclear accidents. Recent examples include Humanitarian Assistance/Disaster Response (HA/DR) and Non Combatant Evacuation Operations (NEO). HA/DR type missions have been planned and executed to mitigate the effects of catastrophic tropical cyclones, flooding, wild fires, and tsunami. NEO missions are focused on the evacuation of a nation’s citizens and other foreigners from …

A Modeling System For Integral Simulation Of Propagation Of Ocean Surge And Wave And Their Impinging On Coastal Structure (Extended Abstract), Ke Qu, Hansong Tang, Anil Agrawal

Ocean Waves Workshop

Now it has become necessary to develop our capability to directly simulate many emerging coastal ocean flow and wave problems. These flow problems present a common challenge to our modeling capability; they involve multiphysics phenomena spanning a vast range of spatial and temporal scales, however, so far essentially we have no methods and computer software to directly and integrally simulate these phenomena. Now it has become necessary for us to develop new capability to model them in efficient ways and high-fidelity. Towards this goal, we have developed a brand new, unprecedented modeling system that is able to directly evaluate many …

Session 1 Presentation - Use Of Offshore Energy Facilities As Deepwater Ocean Observing Platforms, Jeffrey Morin, Pak Leung, Ruth Mullins Perry, Eoin Howlett, Armen-Sjur Minassian, Rudy Poulos

Ocean Waves Workshop

Wave measurement is one of the major components for any ocean observation program, however, it is also the most challenging one due to its complexity. For Oil & Gas community, wave data is often used for platform stability calculation, operational decision making, structure fatigue analysis, and engineering design criteria.

Wavemaker Improvements At The University Of New Orleans Towing Tank, Ryan D. Thiel

Ocean Waves Workshop

No abstract provided.