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 43 for “"Tidal flow"”.
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Numerical modelling of solute transport processes using higher order accurate finite difference schemes. Numerical treatment of flooding and drying in tidal flow simulations and higher order accurate finite difference modelling of the advection diffusion equation for solute transport predictions.
… distributions with both uniform and rotational flow fields. They were further tested for a number of 2-D continuous discharge cases, with the corresponding exact solutions having also been derived herein. All the numerical tests in both the 1-D and 2-D cases were compared with the corresponding …
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Numerical modelling of tidal flows around headlands and islands
This thesis presents a study of tidal flow interaction with headland and island features. Wake development in the lee of topographic features can generate complex two- and three-dimensional flow structures. The primary objectives of the research are to (i) determine the suitability of traditional …
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Limitations on tidal-in-stream power generation in a strait
… to limit the effects of global climate change, tidal-in-stream energy is being investigated as one of many possible sustainable means of generating electricity. In this scheme, turbines are placed in a tidal flow and kinetic energy is extracted. With the goal of producing maximum power, there is …
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Laboratory Analysis of Vortex Dynamics For Shallow Tidal Inlets
… vortical structures. At the mouth of an inlet, tidal flow forces the formation of two dimensional vortical structures whose lateral extent is much greater than the water depth. After the starting jet vortex dipole detaches from the inlet, secondary vortices shed due to separation from the inlet …
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Surface and bottom boundary layer dynamics on a shallow submarine bank : southern flank of Georges Bank
… layer driven by the semi diurnal tides and the flow field's response to wind forcing. The observational analysis presented here is based on a combination of moored array and bottom tripod-mounted current, temperature, conductivity, and meteorological data taken between February and August 1995. …
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Exchange flows in an urban water body: Bayou St. John responses to the removal of flood control structures, future water elevation control, and water quality
… has two anthropogenic structures that regulate flow from the Lake . The City of New Orleans has plans to remove the inner control structure to improve water quality. Field and numerical methods used in this study show removing this structure increased water elevations throughout the Bayou but …
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Experimental investigation of 2D and 3D internal wave fields
… stereo- Particle Image Velocimetry (PIV) flow field measurement techniques. A benchmark was provided by an experiment involving tidal flow over a 2D Gaussian ridge; this study providing a counterpart with which studies of a 3D incised Gaussian ridge could be compared with. To further …
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Surface and bottom boundary layer dynamics on a shallow submarine bank : southern flank of Georges Bank
… layer driven by the semidiurnal tides and the flow field's response to wind forcing. The observational analysis presented here is based on a combination of moored array and bottom tripod-mounted current, temperature, conductivity, and meteorological data taken between February and August 1995. …
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Turbulence Modelling of Tidal Currents in Rectangular Harbours
… and layer-integrated Reynolds equations. As most flows in practice are always turbulent, it is necessary to try and model the turbulence as accurately as possible. Various turbulence models including the mixing length, k-s and algebraic stress turbulence models all adopting a time average …
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Experimental investigation of internal tide generation by two-dimensional topography using synthetic Schlieren
… topography oscillated horizontally to simulate tidal flow. The wave field was measured by capturing the distortion of a pattern of random dots placed on a light sheet behind the tank using a CCD camera, and using the synthetic Schlieren processing of the movies obtained. Four experiments were …
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Seabird use of tidal stream environments and potential interactions with tidal energy devices
… demand from renewable energy sources such as tidal streams. However, tidal stream environments are also important habitats for marine wildlife, including seabirds. Risk of collision and habitat displacement are the major negative effects of concern. The following thesis therefore examined the …
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The development of nonlinear surface and internal wave groups
… of large amplitude internal waves by stratified tidal flow over a submarine ridge indicates that the large amplitude and asymmetry of the topography are critical in determining the type of flow response. The calculated Froude numbers response length scale and duration differ markedly between the …
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Diatoms of the genus thalassiosira from the tidal San Joaquin River, Stockton CA, USA
… the lower twenty-eight km strongly influenced by tidal flow reversals driven by the San Francisco Estuary. Ninety four whole water samples were collected from surface waters during the months of July, August, September and October in 2005 and the months of July and August in 2006. Six species of …
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Channel Processes and form Near the Tidal Limit
<p>Coastal plain river flow is driven by the topographic gradient unless acted on by marine tides. Where sufficiently strong tides occur, a tidal wave will enter the river mouth and advance upstream until it dissipates due to bottom friction and downstream flow. It follows that near the upstream …
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Modeling coupled physics and biology in ocean straits
… represent biology for various physical flows, including advection-dominated flows over discontinuities, by using the Weighted Essentially Non-Oscillatory (WENO) scheme. The numerical model is verified against a Discontinuous-Galerkin (DG) numerical scheme on an unstructured grid. Several …
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Investigating the foraging ecology of black guillemots Cepphus grylle in relation to tidal stream turbines and marine protected areas
Tidal streams provide important foraging habitat for several species of marine top predator. This habitat is potentially vulnerable to alteration from the construction of tidal stream turbines. These turbines have been installed in the north of Scotland, with several hundred more planned. Tidal …
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Theoretical and experimental study of nonlinear internal gravity wave beams
… and may also be generated in the oceans by tidal flow over sea-floor topography. So far, internal wave beams have been studied mostly using the linearized equations of motion valid for small-amplitude disturbances. The present thesis examines theoretically and experimentally some aspects of …
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The application of historical data and computational methods for investigating causes of long-term morphological change in estuaries : a case study of the Mersey Estuary, UK
… from the net effects of perturbations induced by tidal, seasonal and episodic events, averaged over a longer period. Theoretically a dynamic equilibrium may exist between deposition and erosion when considered over a time period that is sufficiently long to encompass the cyclic variability that …
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The role of Marine Renewable Energy structures and biofouling communities in promoting self-sustaining populations of Non-Native Species
… observed where buoys were deployed in greater tidal flow rates. However, overall community composition was not significantly different between ‘high’ (>1 ms-1) and ‘low’ (<1 ms-1) flow areas and for buoys deployed for different time durations (1-7 years). These finding have important …
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An Examination of the Legal, Social, and Environmental Issues That Surround the Restoration of Tidal Hydrology in Edisto Beach, South Carolina
… for roadbeds through these marshes, existing tidal creeks were routinely filled and cut off from oceanic tidal flow by constructed causeways. The Highway 174 Causeway in Edisto Beach, SC is one example. These manmade obstructions to tidal flooding have far-reaching impacts in coastal wetlands, …
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