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Title: Computer modelling of tidal water movement, dispersion process and residual currents in an embayment
Author: Huang, A.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1995
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A numerical model for tidal water movements, which is based on the shallow water equations, has been set up in this study. The shallow water equations are solved using the explicit finite difference method and the study area is divided into relatively rough grid meshes in the initial stage of this study. After the model has been justified and can be operated steadily, the computational area is refined. On the basis of the initial tidal model mentioned above, a further developed tidal model, in which the shallow water equations is solved using a well-known alternating direction implicit method, is programmed. The model is operated with a staggered grid system which allows the ADI numerical scheme to be operated and the two dimensional difference equations to be reduced into one dimensional equations, which can be solved simply, even in an implicit numerical scheme. Tidal water elevation, tidal current velocity field and the tidal water flow pattern can be produced by the model. When the tidal model is running and provides the velocity field of the tidal currents, an advective-diffusion equation is introduced into the model in order that the model can predict the water diffusion and dispersion processes for a water-borne effluent concentration, i.e. salinity, in the study area. The model combining the shallow water and advective diffusion equations becomes the framework of the water quality model. The tidal model is also used to produce tidally-induced Eulerian residual currents for the area of interest by introducing a time filter sub-programme into the model, since residual current significantly affect transport processes in coastal areas, which are important in controlling the water quality in the study area. The model is applied to a real embayment, Swansea Bay, with real bathymetry. The relevant results obtained by the numerical model have been compared to the real data collected from the same computing area, and the results are encouraging showing some of the numerical results in good agreement with the real data.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available