A5051166993- Oceanographic and Atmospheric Processes
- Ocean Waves and Remote Sensing
- Wind Energy Research and Development
- Tropical and Extratropical Cyclones Research
- Coastal and Marine Dynamics
- Wind and Air Flow Studies
- Climate variability and models
- Underwater Acoustics Research
- Meteorological Phenomena and Simulations
- Hydrology and Sediment Transport Processes
- Wave and Wind Energy Systems
- Geology and Paleoclimatology Research
- Geophysics and Gravity Measurements
- Coastal wetland ecosystem dynamics
- Marine and coastal ecosystems
- Fluid Dynamics and Vibration Analysis
- Soil Moisture and Remote Sensing
- Precipitation Measurement and Analysis
- Aquatic and Environmental Studies
- Solar Radiation and Photovoltaics
- Cavitation Phenomena in Pumps
- Remote Sensing in Agriculture
- Methane Hydrates and Related Phenomena
- Coastal and Marine Management
- Atmospheric and Environmental Gas Dynamics
University of Edinburgh
2007-2024
University of Reading
2005-2019
Edinburgh College
2019
Scottish Association For Marine Science
2012
Bangor University
2010
Abstract Vertical mixing in the bottom boundary layer and pycnocline of Laptev Sea is evaluated from a rapidly sampled 12-h time series microstructure temperature, conductivity, shear observations collected under 100% sea ice during October 2008. The turbulent kinetic energy dissipation was observed to be enhanced (ε ∼ 10−4 W m−3) beyond background levels 10−6 m−3), extending up 10 m above seabed when simulated tidal currents were directed on slope. Upward heat fluxes into halocline-class...
Abstract The structure function method for estimating the dissipation rate of turbulent kinetic energy, previously validated measurements from seabed fixed mounts, is applied to data 1.2-MHz acoustic Doppler current profiler (ADCP) instruments operating in pulse–pulse coherent mode and mounted midwater below a tethered buoy. Movements buoy introduce additional relative velocity components, but it hypothesized that these flow components should not seriously interfere with turbulence...
This Round Robin Test program aims to establish the influence of combined wave and current effect on power capture performance a generic tidal turbine prototype. Three facilities offering similar range experimental conditions have been selected basis that their dimensions along with rotor diameter translate into low blockage ratio conditions. The shows differences between up 25% in terms average coefficient, depending cases. To prevent flow velocity increasing these differences, coefficients...
Decision makers need accessible robust evidence to introduce new policies mitigate and adapt climate change. There is an increasing amount of environmental information available policy concerning observations trends relating the climate. However, this data hosted across a multitude websites often with inconsistent metadata sparse quality, accuracy validity data. Subsequently, task comparing datasets decide which most appropriate for certain purpose very complex infeasible. In support...
Wave–current interaction phenomena are often represented through coupled model frameworks in ocean modelling. However, benchmarking of these models is scarce, revealing a substantial research challenge. We seek to address this selection cases for wave–current This comprises series analytical and experimental test spanning three diverse conditions wave run-up, one scenario waves opposing current flow, 2-D arrangement propagating over submerged bar. simulate coupling the spectral model,...
Abstract Numerical Weather Prediction (NWP) fields are used to assist the detection of cloud in satellite imagery. Simulated observations based on NWP within a framework Bayes' theorem calculate physically-based probability each pixel with an imaged scene being clear or cloudy. Different thresholds can be set probabilities create application-specific cloud-masks. Here, this is done over both land and ocean using night-time (infrared) We use validation dataset difficult targets for Spinning...
A broadband acoustic Doppler current profiler was used to measure the velocity field of ebb tidal jet formed at entrance Otago Harbour, South Island, New Zealand. Four separate surveys were conducted where various sets transects run continuously over a 13 hour period, producing time series profiles with 1 sampling grid an across‐jet resolution 20 m and along‐jet 150 m. The is phase locked response harbor, making it possible combine data from cycle produce synoptic maps depth‐averaged field....
High horizontal resolution moving vessel acoustic Doppler current profiler (ADCP) observations of the spatial pattern cross‐stream velocities in a curved tidal channel show radially outward surface up to 10 cm s −1 which are maximum midchannel, consistent with helical secondary flow vertical plane normal depth‐averaged velocity. The 30‐m‐cross‐ and 150‐m‐along‐channel from 2700‐m‐long section 350‐m‐wide horizontally vertically well mixed radius curvature 1–5 km. along‐channel allows...
A Round Robin Tests program is being undertaken within the EC MaRINET2 initiative. This programme studies used facility influence can have on performance evaluation of a horizontal axis tidal turbine prototype when it operated under wave and current conditions. In this paper, we present design experiments that throughout work results related to flow characterisation obtained at Ifremer circulating tank, Cnr-Inm towing tank ocean research FloWave. These facilities been identified provide...
Full-scale tidal turbines deployed in channels are subjected to complex flow due the effects of local bathymetry and coastline shape which modify directionality, shear, twist speed underlying tidally forced flow. In response these effects, wake an operational turbine will vary spatially temporally. order predict form, is a key step for scaling up energy as developments move from single devices arrays, we have developed demonstrated open source turbine-embedded regional three-dimensional (3D)...
Wave–current interactions (WCI) emerge in nearshore coastal areas, prompting the development of coupled modelling systems to simulate these phenomena. We present a new multi-scale parallelised Python-interfaced WCI system adopting component-based approach enabling model-components integration without inhibiting their respective development. The underlying principles emphasise model equitability, flexibility and language interoperability. hybrid comprises spectral wave SWAN 2-D shallow-water...
Abstract This paper describes the techniques used to obtain sea surface temperature (SST) retrievals from Geostationary Operational Environmental Satellite 12 (GOES-12) at National Oceanic and Atmospheric Administration’s Office of Data Processing Distribution. Previous SST retrieval relying on channels 11 μm are not applicable because GOES-12 lacks latter channel. Cloud detection is performed using a Bayesian method exploiting fast-forward modeling prior clear-sky radiances numerical...
Harnessing the energy of tidal currents has huge potential as a source clean renewable energy. To do so in reliable and cost effective way, it is critical to understand interaction between turbines, waves, turbulent ocean. Scaled testing tank test provides controlled, realistic, highly reproducible down-scaled open ocean environment, key step gaining this understanding. Knowledge hydrodynamic conditions during tests measurements at multiple locations are required accurately characterise...
Abstract A study of the formation and propagation volume anomalies in North Atlantic Mode Waters is presented, based on 100 yr monthly mean fields taken from control run Third Hadley Centre Coupled Ocean–Atmosphere GCM (HadCM3). Analysis temporal spatial variability thickness between pairs isothermal surfaces bounding central temperature three main subtropical mode waters shows that large-scale occurs over time scales ranging 5 to 20 yr. The largest are associated with a southward shift...
Acoustic Doppler Profilers (ADPs) are routinely used to measure flow velocity in the ocean, enabling multi-points measurement along a profile while Velocimeters (ADVs) laboratory instruments that provide very precise point measurement. The experimental set-up allows comparison of from these two instruments. Simultaneous multi-point measurements horizontal tank Single-Beam Profiler (SB-ADP) were compared against multiple co-located an ADV. Measurements performed FloWave Ocean Energy Research...
Abstract A study of thermally driven water mass transformations over 100 yr in the ocean component Third Hadley Centre Coupled Ocean–Atmosphere General Circulation Model (HadCM3) is presented. The processes surface-forced transformations, subduction and mixing, both above below winter mixed layer base, are quantified. Subtropical Mode Waters formed by surface heat fluxes subducted at more or less same rate. However, Labrador Seawater Nordic classes (the other main classes) primarily mixing...
Abstract Flow in coastal waters contains multi-scale flow features that are generated by separation, shear-layer instabilities, bottom roughness and topographic form. Depending on the target application, mesh design used for ocean modelling needs to adequately resolve pertinent study objectives. We investigate an iterative strategy, inspired hydrokinetic resource assessment, uses modelled dynamics refine across key features, a number of elements constrain density. The method is...
Tidal Stream Energy is considered a regular, predictable and dense energy source with potential to make significant contribution our future needs. Development of the industry, from resource assessment device design operation, requires characterisation flow environment at variety spatial temporal scales tidal sites. Demand for arises companies developing, installing operating turbine prototypes or small arrays in locations Scotland France Canada. Flow stream applications relies on measurement...
Most of the mixing throughout world ocean is driven by wind forcing surface, which also exerts a controlling influence rate exchange gases between atmosphere and ocean. As part UK NERC-funded surface boundary layer consortium "OSMOSIS" we conducted AUV-based observations near-surface turbulent bubble entrainment in Clyde estuary, Scotland, conjunction with program ship-, mooring, glider-based measurements. A Hydroid REMUS 600m AUV equipped forward-mounted microstructure sensing package...
Abstract Flow in coastal waters contains multi-scale flow features that are generated by flow-separation, shear-layer instabilities, and bottom roughness. Depending on the target application, ocean modelling needs to adequately resolve certain key coherent pertinent study objectives. Insufficient model resolution of hydrodynamics can diffuse their structure, leading a potential misrepresentation system hydraulics. As community adopts use unstructured models where mesh convergence analysis...
Full-scale tidal turbines deployed in channels are subjected to complex flow due the effects of local bathymetry and coastline which modify speed directionality flow. In response these effects, wake a turbine will vary spatially temporally. To predict form for scaling up energy developments from single devices arrays, we have developed demonstrated an open source turbine-embedded regional three-dimensional hydrodynamic model power prediction. Simulation outputs been validated against in-situ...