Nested circulation modelling of inter-tidal zones: details of a nesting approach incorporating moving boundaries |
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Authors: | Stephen Nash Michael Hartnett |
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Institution: | (1) Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Galway, Ireland |
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Abstract: | Nested circulation models developed to date either exclude the flooding and drying process or prohibit flooding and drying
of nested boundaries; they are therefore ill-suited to the accurate modelling of inter-tidal areas. The authors have developed
a nested model with moving boundaries which permits flooding and drying of both the interior domain and the nested boundaries.
The model uses a novel approach to boundary formulation; ghost cells are incorporated adjacent to the nested boundary cells
so that the nested boundaries operate as internal boundaries. When combined with a tailored adaptive interpolation technique,
the approach facilitates a dynamic internal boundary. Details of model development are presented with particular emphasis
on the treatment of the nested boundary. Results are presented for Cork Harbour, a natural coastal system with an extensive
inter-tidal zone and a complex flow regime which provided a rigorous test of model performance. The nested model was found
to achieve the accuracy of a high resolution single grid model for a much lower computational cost. |
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