Modelling t idal f lows in Passamaquoddy Bay

Work on modelling M, tidal flows in Passamaquoddy Bay is being done with a suite of three numerical 3 0 finite element models. A linear harmonic model gives a first order estimate of tidal currents and elevations. A second model, fully nonlinear, demonstrates the significant effects of quadratic friction, tidal elevation and the advection of momentum on the tidal flows and as well as the generation of a residual circulation. A third model has been developed from the second that will take into consideration the drying of intertidal areas on the falling tide. Given the complex shoreline, topography and strong tidal currents in Passamaquoddy Bay, it is felt the third model will be necessary to accurately predict flows in the area. Results given here are still preliminary and it is anticipated that comparisons with observations will show where further tuning of the model is necessary