A5034793790- Ocean Waves and Remote Sensing
- Oceanographic and Atmospheric Processes
- Coastal and Marine Dynamics
- Tropical and Extratropical Cyclones Research
- Meteorological Phenomena and Simulations
- Optical and Acousto-Optic Technologies
- Geophysics and Gravity Measurements
- Climate variability and models
- Aeolian processes and effects
- Atmospheric and Environmental Gas Dynamics
- Advanced Fiber Optic Sensors
- Landslides and related hazards
- Underwater Acoustics Research
- Atmospheric aerosols and clouds
- Coastal and Marine Management
- Soil and Unsaturated Flow
- Soil Moisture and Remote Sensing
- Radio Wave Propagation Studies
- Plant Water Relations and Carbon Dynamics
- Fire effects on ecosystems
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Flood Risk Assessment and Management
- Geology and Paleoclimatology Research
- Ocean Acidification Effects and Responses
UNSW Sydney
2010-2024
In this paper we report on a laboratory study, the Spray Production and Dynamics Experiment (SPANDEX), conducted at University of New South Wales Water Research Laboratory in Australia. The goals SPANDEX were to illuminate physical aspects spume droplet production dispersion; verify theoretical simplifications used estimate source function from ambient concentration measurements; examine relationship between implied strength forcing parameters such as wind speed, surface turbulent stress,...
Refining radiative‐transfer modeling capabilities for light transmission through the sea surface requires a more detailed prescription of roughness beyond probability density function slope field. To meet this need, exciting new measurement methodologies now provide opportunity to enhance present knowledge roughness, especially at microscale. In context, two intensive field experiments using R/P Floating Instrument Platform were staged within Office Naval Research's Radiance in Dynamic Ocean...
Abstract Turbulent flow over strongly forced steep steady and unsteady waves is simulated using large-eddy simulation (LES) with time t space x varying wave height h ( , ) imposed as a lower boundary condition. With waves, based on measurements of incipient active breaking collected in wind-wave flume, while numerical code used to generate an evolving packet (group). Highly intermittent airflow separation found the simulations, results suggest near crest occurs prior onset breaking. The form...
Despite recent improvements in the accuracy of hurricane track forecasts, mean position errors still remain unacceptably large. For example, recurvature is captured poorly by forecast models and can produce excessively large errors. This study addresses problem forecasting three ways. First, initial conditions for model are augmented a dense coverage high spatial temporal resolution satellite-derived wind vectors. Second, to gauge extent which this additional four-dimensional detail...
Abstract The Australian marine research, industry, and stakeholder community has recently undertaken an extensive collaborative process to identify the highest national priorities for wind-waves research. This was under auspices of Forum Operational Oceanography Surface Waves Working Group. main steps in were first, soliciting possible research questions from via online survey; second, reviewing at a face-to-face workshop; third, ranking by individuals. resulted 15 identified priorities,...
Turbulent flow over steep steady and unsteady wave trains with varying height h(x, t) propagation speed c is simulated using large-eddy simulation (LES) in a wind-wave channel [17]. The imposed waveshape based on measurements of incipient active breaking waves collected tank, while numerical code used to generate an evolving train (or group) [3]. For the adopted waveshapes, process studies are carried out age c/u* from ~ 1 10: airflow friction velocity u*. Under strong wind forcing or low 1,...
Optical variability occurs in the near‐surface and upper ocean on very short time space scales (e.g., milliseconds millimeters less) as well greater scales. This is caused by solar, meteorological, other physical forcing biological chemical processes that affect optical properties their distributions, which turn control propagation of light across air‐sea interface within ocean. Recent developments several technologies modeling capabilities have enabled investigation a variety fundamental...
In response to the growing need for robust validation data Phillips (1985) breaking wave spectral framework, we contribute new field results observed from R/P FLIP crest length distributions, Λ, during two different wind‐wave conditions, and strength one condition. The first experiment in Santa Barbara Channel had developing seas second central Pacific Ocean south of Hawaii mature seas. These are among experiments use dissipation rate measurements probing up into together with simultaneous...
A dynamical understanding of the physical process surface gravity wave breaking remains an unresolved problem in fluid dynamics. Conceptually, can be described by inception and onset, where is initiation unknown irreversible processes within a crest that precede visible manifestation onset. In search for energetic indicator inception, we use ensemble non-breaking crests evolving unsteady packets simulated numerical tank to investigate evolution each term kinetic energy balance equation. We...
Abstract A spectral framework for quantifying the geometric/kinematic and dynamic/energetic properties of breaking ocean waves was proposed by Phillips in 1985. assumed a constant strength coefficient to link kinematic/geometric crest associated excess energy momentum fluxes from upper ocean. However, scale-dependent (spectral) is needed, but unavailable measurements. In this paper, feasibility parametric mean effective valid wide range sea states investigated. All available wave datasets...
The breaking of surface gravity waves is a key process contributing to air-sea fluxes and turbulent ocean mixing. highly nonlinear nature wave breaking, combined with the challenges observing this in laboratory or field setting, leaves our understanding energetic processes underpinning incomplete. Progress towards refining was made recent study (D. G. Boettger et. al., An signature for inception waves, Journal Fluid Mechanics 959, A33 (2023)), which identified an kinetic energy evolution...
We examine the influence of wind forcing on inception breaking in surface gravity waves using an ensemble high-resolution numerical simulations. find that there is a critical point energetic evolution wave which convergence kinetic energy at crest can no longer be offset by conversion to potential energy, resulting rapid growth up onset. This signature shown consistently differentiate between non-breaking and under range speeds.
This paper reviews the research activities that were carried out under auspices of National Ocean Partnership Program (NOPP) to advance in wind wave modeling and transfer maturing technologies into operational community models. Primary focus funded this program was improve source terms associated with deep water waves a secondary on shallow processes. While has been developing capabilities for stochastic phase averaged models, some work reported here also touches resolved models as well...
The Australian Forum for Operational Oceanography (FOO), started in 2015, established a working group to focus on wind-waves. One of the aims this was identify key priorities wind-waves research. This undertaking has been driven by needs, but Australia is just one part larger international waves community; results process are also relevant other marine-focused nations. research engaged both researchers and stakeholders democratic, collaborative, iterative process. main steps were 1)...