Lu, Wright and Brickman recently modified the CANDIE code by including a free-surface and partial cells. The updating of free-surface elevations is implicit in time so that the extra computational cost is minimal in comparison with the original CANDIE code. The addition of partial cells allows the bottom cell of the model to have variable thickness, hence improving the ability to accurately represent topographic variations. They tested the modified model by solving a two-dimensional, linearized problem of internal tide generation over topography. They found the numerical model results agree reasonably well with the semi-analytic solution of Craig (1987).

The above plot shows a time sequence of internal tide stream-function. Starting from the second panel from the top, each panel lags the one above it by 10.9 hours (the tidal period is 17.45 hours). Positive (negative) values correspond to a clockwise (counter-clockwise) baroclinic circulation. The results are for the sub-critical case (alpha=0.6) using 1 kim horizontal resolution.

For details, please click here to download the ps-file of the paper.

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