Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Wind waves"”.
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Similarity relations of wind waves in finite depth
Three formulations for the rear face of a growing wind-sea spectrum in finite depth based on Phillips (1958), Toba (1972) and Donelan et al. (1985) are tested using spectral measurements from Lake St. Clair. Assuming spectral similarity in wave number space relations between the energy, equilibrium …
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Gradient-Based Surface Reconstruction and the Application to Wind Waves
… to imaging slope gauge data measured in the wind-wave facility Aeolotron in Heidelberg. Using newly developed segmentation methods, it is possible to detect different coordinate system orientations of gradient field data and reconstruction algorithms. In addition, the use of a zero slope …
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Gradient-Based Surface Reconstruction and the Application to Wind Waves
… to imaging slope gauge data measured in the wind-wave facility Aeolotron in Heidelberg. Using newly developed segmentation methods, it is possible to detect different coordinate system orientations of gradient field data and reconstruction algorithms. In addition, the use of a zero slope …
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Modeling wind forcing in phase resolving simulation of nonlinear wind waves
Wind waves in the ocean are a product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts the ability of traditional phase averaged models to simulate their complex …
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One-dimensional wave spectrum analysis of wind waves off Cape Town
Wind waves in the vicinity of Cape Town, South Africa, were measured by means of an N.I.O. (England) ship-borne wave recorder, in water depths varying from 12 - 140 metres. One dimensional frequency spectra were computed from the records, by power spectrum analysis, based on the method of Blackman …
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Modeling wind forcing in phase resolving simulation of nonlinear wind waves
Wind waves in the ocean are a product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts the ability of traditional phase averaged models to simulate their complex …
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The Effects of Variable Parameters on the Behavior of Initial Wind Waves
<p>The generation mechanism of short wind waves is generally thought to be a viscous instability at the air-sea interface. The short, regular waves arising from a sudden wind on a still water surface have a dispersion relation which is characteristic of gravity-capillary waves. The effects of …
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Spatio-temporal slope measurement of short wind waves under the influence of surface films at the Heidelberg Aeolotron
… of the two-dimensional slope of short wind-driven water waves at unprecedented temporal and spatial resolution. Wave number spectra are measured up to k = 13000 rad/m with a temporal resolution of more than 1500 Hz. The high sampling frequency eliminates aliasing up to wave numbers of …
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Infragravity waves over topography : generation, dissipation, and reflection
Ocean surface infragravity waves (periods from 20 to 200 s) observed along the southern California coast are shown to be sensitive to the bottom topography of the shelf region, where propagation is linear, and of the nearshore region, where nonlinearity is important. Infragravity waves exchange …
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Infragravity waves over topography: generation, dissipation, and reflection
Ocean surface infragravity waves (periods from 20 to 200 s) observed along the southern California coast are shown to be sensitive to the bottom topography of the shelf region, where propagation is linear, and of the nearshore region, where nonlinearity is important. Infragravity waves exchange …
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Ανάπτυξη ανεμογενών κυματισμών. Επεξεργασία μετρήσεων και μαθηματικά μοντέλα πρόγνωσης
THE GENERATION AND GROWTH OF WIND WAVES IS DUE TO THE ACTION OF THREE PHYSICAL PROCESSES: THE ENERGY TRANSFER FROM WIND TO SEA, THE WAVE ENERGY DISSIPATION AND THE NONLINEAR ENERGY TRANSFER BETWEEN THE INTERACTING WAVES. THIS PHYSICAL PHENOMENON IS STUDIED BY MEANS OF IN-SITU WAVE MEASUREMENTS AND …
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Hydrodynamic Characterisation and Wave Current Interaction around Dunnet Head in the Pentland Firth with Implications for Marine Energy Generation
… present.<br/>This study involved monitoring waves and currents in the Firth to improve existing knowledge. An Acoustic Wave and Current Profiler (AWAC) and an Acoustic Doppler Current Profiler (ADCP) were deployed in the Pentland Firth approximately 1 km north of Dunnet Head for two 15-week …
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Vessel induced physical effects related to navigation changes on the Kanawha River, West Virginia
… equations which simulate ambient velocities; wind waves; diverging waves; squat and backwater generated by the tows; and propeller jet velocities and its associated entrainment velocities. Based on the calculated velocities, concentrations of suspended sediment induced by the disturbance are …
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WAVE AND CURRENT OBSERVATIONS IN A TIDAL INLET USING GPS DRIFTER BUOYS
… showed improved capability, particularly in the wind-wave band. Vertical measurements were significantly improved through the addition of the accelerometer. A large array of WRD buoys was deployed in the Golden Gate channel at the entrance to San Francisco Bay and allowed to drift with the …
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Modeling and simulation of standalone hybrid PV-wind renewable energy system base case study: Iraq
… collected from renewable sources like Solar, wind, waves and others. The problem of renewable sources that is unexpected and have intermittent nature. This thesis contain modeling of Photovoltaic renewable energy system to produces maximum 10 KW/h. Moreover, the study contains modeling of wind …
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Little Buoys, Big Ocean: Observations of Wave-Driven Transport of Buoyant Objects in the Nearshore and Marginal Ice Zone
… and observations of transport driven by wind and waves in the Arctic marginal ice zone. The microSWIFT is a small buoy equipped with a GPS module to measure the buoy'sposition and horizontal velocities and an Inertial Measurement Unit (IMU) to directly measure the buoy's rotation rates, …
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Investigação de efeitos de escoamento 3D e de ondas de vento na aplicação de um modelo de transporte de sedimentos
… direction than that defined by 2DH currents. The wind waves also interfere in the solid transport, as the combined wacecurrents interaction promotes an increase of the transport capacity. This work aims to evaluate the effects of adjusting the direction of currents near the bottom via 3D models …
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The sedimentology of bedforms to barforms within tidally-influenced fluvial zones (TIFZx): lower Columbia River, OR/WA, USA, and the lower Chehalis River, WA, USA
… effects of flood-tidal currents and intrabasinal wind-waves. Vibracores taken from two mixed tidal-fluvial mid-channel bars have vertical grain size trends displaying coarsening-upwards sequences towards the bar-tops, where the bar-top medium sands become very-well sorted. This coarsening-upwards …
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Mapping the Distribution of Barrier Island Slash Pine Woodland and Determining Growth Responses of Pinus elliottii to Hurricane Katrina (2005) on Cat Island, Mississippi
… such as extreme episodic events. The wind, waves, and storm surges of Hurricane Katrina heavily impacted the Mississippi–Alabama barrier island chain on August 29, 2005. Cat Island experienced a 7-m storm surge, the highest wind energy in the chain, but was estimated to have the least …
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Drift modelling of marine mammal carcases in coastal waters
… is governed by its buoyancy, shape, and the wind, waves and currents it experiences. Here, I develop a drift modelling framework for marine mammal carcases in coastal waters. The resulting models were run forwards and backwards in time to provide insights into strategies for environmental …
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