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This test is based on Ebrahimi et al.50 experimental set up
reported on the transmission of the tidal oscillations in a lagoon. In this
test a trapezoidal barrier build of non cohesve sand seperates a closed lagoon
from the sea(fig. 14). Porosity and intrinsic permebelity of the barrier are
0.3 and , respectively. Left hand side boundary condition are open
sea that fluctuates with an amplitude of 60 mm and a period of     , while right and bottom boundaries are
closed with zero velocities water . Figure 14
illustrates the dimensions of experimental setup and the boundary conditions of the problem. Points A, B
and C illustrated in this figure are the places where the solutions are going to be presented and compared with the experimental obsorvations.Point A and point B
displays water level fluctuations in the lagoon and in the
open sea, respectively. On the other hand, point C
is used to illustrate the velocity fluctuations in the open sea. More detailed
descriptions of the measurements and data my be found in Ebrahimi et. al. 50
and in Yuan et al. 26.  Konga et al. 25 and Li et al.23 have been studied this experiment using finite volume/finite
difference andcontrol volume methods, respectively.
Here this experiment is solved with the use of the new procedure of free surface tracking presented in this paper. To do so, the grid size is taken as
 in tiangular shape. The surface water level fluctuations evaluated in
this paper are compared with the experimental obsorvation in Figures 15 and 16 for point B and A,
respectively, where an excellent
aggrement exists between two results. Moreover, the flow velocity
predicted by the present model for point C is compared with the experimental
obsorvation in Fig.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 a large extent12

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