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• W1899211478 abstract "In general, coastal and shelf hydrodynamic modelling is undertaken with limited area numerical models such as Delft3D or Mike 21. To conduct successful numerical simulations these programmes require appropriate boundary conditions. Various options exist to obtain boundary conditions such as Neumann conditions, specifying water levels, specifying velocities and combination of these, amongst others. In this study one specific method is investigated, namely the specification of water levels on all the open boundaries using a reduced approach. This method may be more appropriate than Neumann conditions when the domain is fairly large and is also of particular interest as it allows measured data to be incorporated in the boundary conditions, although the latter was not considered in this study. The boundary conditions of interest are determined by separating the crossshore and alongshore components of the momentum equations. To justify the separation, the equations of motion are firstly non-dimensionalised to determine the relative importance of various terms and then scaled to determine under which conditions the cross-shore and alongshore components can be solved independently. The efficacy of a computer program, Tilt, to calculate the open boundary conditions have been investigated for a number of idealised cases. Based on an understanding of the underlying physics and scaling assumptions, situations where these open boundary conditions underperformed have been analysed and reasons given for their underperformance. When applied to real-life situations it is likely that one or more of the scaling assumptions will be violated. Comment is provided on the likely errors in model simulations should this occur. The main conclusions are that the reduced approach used in Tilt restricts fairly significantly the range of flow that can be simulated. Should the scaling assumptions underlying Tilt be satisfied, Tilt performs adequately for limited area model simulations of coastal and shelf regions, however there remain some concerns: • The no flux condition at the coast and clamped water level offshore ii Stellenbosch University https://scholar.sun.ac.za" @default.
• W1899211478 created "2016-06-24" @default.
• W1899211478 creator A5068503785 @default.
• W1899211478 date "2015-03-01" @default.
• W1899211478 modified "2023-09-24" @default.
• W1899211478 title "Investigation of a simplified open boundary condition for coastal and shelf sea hydrodynamic models" @default.
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• W1899211478 hasPublicationYear "2015" @default.
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