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Numerical Modelling of Tidal Flow through Irreversible Gates

R. Balaji

Abstract



Irreversible gates that control tidal flow in and out of Lake of Tunis were numerically modeled to assess tidal current pattern of lake. The numerical study was carried out using a finite element based numerical scheme, RMA2 [Donnell et al., 2006]. The tidal gates were modeled as irreversible control structures and various numerical parameters were calibrated using set of measured water level and tidal flow data [Gana and Kochlef, 2007]. The estimated water level variations, upstream and downstream of tidal gates and tidal discharge through gates obtained from numerical model are in agreement with measured data. The model results showed that tidal induced current magnitudes do not exceed 0.4m/s inside lake. Using the estimated tidal hydrodynamics, numerical modeling of flushing characteristics of the lake was carried out and the resident time of tides was estimate to be of the order of 7days. The details of numerical scheme, methodology and results are presented in this paper.

Keywords


Irreversible tidal gate, tidal hydrodynamics, RMA2, flushing.

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