This test is based on Ebrahimi et al.50 experimental set up reported onthe transmission of the tidal oscillations in a lagoon.

In this test atrapezoidal barrier build of non cohesve sand seperates a closed lagoon fromthe sea(fig. 14). Porosity and intrinsic permebelity of the barrier are 0.

3 and , respectively. The water level in the open sea wasfluctuated with an amplitude of 60 mm and a period of  to apply the boundaryconditions. Figure 14 illustrates the dimensions of experimental setup and theboundary conditions of the problem.

Points A, B and C illustrated in thisfigure are the places where the solutions are going to be presented andcompared with the experimental obsorvations. Point A and point B displays waterlevel fluctuations in the lagoon and in the open sea, respectively. On theother hand, point C is used to illustrate the velocity fluctuations in the opensea. More detailed descriptions of the measurements and data my be found inEbrahimi et.

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al. 50 and in Yuan et al. 26.  Konga et al. 25 and Li et al.

23 have beenstudied this experiment using finite volume/finite difference and controlvolume methods, respectively. Here this experiment is solved with the use of thenew procedure of free surface tracking presented in this paper. To do so, the gridsize is taken as  in tiangular shape. Thesurface water level fluctuations evaluated in this paperare compared with the experimental obsorvation in Figures 15 and 16 for point B and A, respectively, where an excellentaggrement exists between two results.

Moreover, the flow velocity predicted bythe present model for point C is compared with the experimental obsorvation inFig.17, where again an excellent matches achieved. It is worth mentioning that Reynolds number in this problem is less than 10, and Darcy assumption is acceptable to alarge extent12