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Thesis Topics:Tidal Physics

 Headland Secondary Flows ADCP measurement and/or modelling the structure of the Secondary Circulation cells formed near the tip of a headland due to the curvature of the flow. Tidal Turbulence ADCP meaurement of the horizontal structure of turbulence in a region where flow separates from the shore. Dynamical balance of flow in Otago Harbour Flows of 2 knots are often seen in the Otago Harbour channel where it passes through the narrow gap between the Halfway Islands. The rapid flow acceleration with the gap results in a change in the dynamical balance of the flow. This project will use a ADCP mounted on the University's vessel to measure flows along the channel, momentum balance and drag coefficient of the flow.
Thesis Topics:Power from Tidal Currents
 Depth effects on power production Underwater turbines can extract power from tidal flows along channels. This project looks at the effects that variation in water depth across the channel has on a channel's potential to produce power. Tidal turbines in a boundary layer This project explores aspects of the influence the bottom frictional boundary layer and the resulting variation of velocity with depth has on power production. Efficency of ducted turbines Tidal turbines in large turbine farms are effectively in ducts created by the channel walls and adjacent turbines. The ducting improves efficency. This project is to quantify their efficency in the rectangular duct created by the sea surface, sea bed and adjacent turbines.

Thesis Topics:Others

 Dynamics of vessels. Use GPS technology to understand acceleration and performance in vessel ranging from rowing skiffs to large ships. Drag on Swimmers Use Otago's swimming flume facility to better understand and measure drag and its various components on human swimmers. Current forces on large ships Large ships in confined harbour basins can significantly distort tidal currents within the basin. This distortion affects the current forces which act on the ship. Knowledge of these forces is important in understanding how to best use tugs to turn vessels over 200m long. This project would be to make measurements around a manoeuvring vessel at Port Otago and/or develop models for the forces acting on the vessel.
Thesis Topics:Sea Ice
 Refrozen cracks (theoretical) When a crack forms in sea ice it frequently fills with sea water which then freezes in an environment which is quite different to that of the host sheet. This project would involve the development of a theoretical model for the refreezing of a crack in sea ice. Refrozen cracks (experimental) Laboratory experiments on the effects of crack width and refreezing time on the mechanical and physical properties of the refrozen crack. Brine movement Measurement and/or theoretical modelling of brine motion within a single brine pocket in sea ice. This problem is complicated by the fact that the shape of the pocket may change in response to the movement of the fluid. Acoustic emission studies Comparison of the character of acoustic emission signals from a crack-free sea ice sheet with one containing a refrozen crack.

Thesis Topics:Wave Sea Ice Interaction

 Mathematical modelling of wave-ice interactions. Ocean waves penetrating a region covered by sea ice, either in the form of pack ice or a shore fast ice sheet, are changed by the ice; they are attenuated and their angular distribution is altered. The ice may also be changed by the waves, e.g. it may be broken up or redistributed into a different configuration. Mathematical models of these phenomena have been under development for several years, supported by experimental work in Antarctica.

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