Model of Semi-Connected Tidal Inlets

Agnieszka Herman

Institute of Oceanography, University of Gdansk, Poland

SeCoTide is a lumped-parameter numerical model of water circulation in a system of tidal basins connected to the open sea by narrow inlets and to each other by shallow "transition areas" (tidal divides or watersheds), as shown schematically in this figure:
The basins are treated as water reservoirs with volumes determined from their bathymetric curves. Both inlets and watersheds are parameterized as one-dimensional channels with a given length, cross-sectional area and water depth. For N basins, the model solves a system of 3N−1 ordinary differential equations (ODEs): N continuity equations for the volume change of each basin, N momentum equations for the inlets and N−1 momentum equations for the watersheds. The flow within the inlets and watersheds is assumed to be driven by water level differences at both ends and damped by friction.

The most important features of SeCoTide are:

The model has been successfully applied to study various aspects of water circulation in the basins of the East Frisian Wadden Sea (Germany) and of the Magdalen Islands (Gulf of Saint-Lawrence, Canada) – see references. SeCoTide is conceptionally very similar to the model of two connected basins developed recently by van de Kreeke et al. (Coastal Engng 2008, 55, 319–332).



Herman, A., 2007. Numerical modelling of water transport processes in partially-connected tidal basins. Coastal Engng, 54, 297-320, doi:10.1016/j.coastaleng.2006.10.003. (article)

Urbański, J.A., Herman, A., 2009. Water exchange between the basins of the German Wadden Sea studied with a coupled Matlab-ArcGIS model. J. Coastal Res., SI 56 (Proc. 10th Int. Coastal Symp., Lisbon, Portugal), 1085-1089. (article)

Useful links

Future work

These are some of the improvements or new functionalities that are planned for the next versions of SeCoTide:

If you have any comments or suggestions, or if you found any bugs in the model, I'll be grateful if you send me an e-mail:
You may also want to visit my home page: Agnieszka Herman