### Utility to calculate and graph co-oscillation tides

This utility calculates and plots the amplitude and phase of a co-oscillation tide in a narrow gulf. The solution is found for one tidal constituent at a time. It is advisable to read the theory, model and example before proceeding to an application.

Projects for which this utility can be used:

- Calculate the tides of Spencer Gulf, South Australia, compare the result with observations and modify the friction parameter to optimize the match between model and observations.
- Find the seiche periods for Spencer Gulf by varying the model period until resonance occurs.
- Investigate seiches in a rectangular semi-enclosed basin, by entering constant width and cross-sectional area and verifying the theoretical seiche period as a resonance in the model.
- Calculate the tides and seiche periods for any narrow gulf or basin by entering the appropriate topographic data.

This utility is based on A. K. Easton (1978) A reappraisal of the tides in Spencer Gulf, South Australia. *Australian Journal of Marine and Freshwater Research* **29**, 467 - 477.

© 2000 M. Tomczak

Last updated 23 August 2000.