The purpose of the this test is to check if the NSWE numerical scheme is not too dissipative and that it does not create large errors in propagation speed.
A long wave with a small amplitude of $0.01m$ and period of $80s$ was sent into a domain of $5m$ depth, grid size of $5m$ and a length of $1km$. At the end, a fully reflecting wall is imposed. The wave length in this case should be $\sqrt{9.81 \cdot 5} \cdot 80 = 560m$. The velocity amplitude should be $\sqrt{\nicefrac{g}{h}} \cdot A = \sqrt{\nicefrac{9.81}{5}} \cdot 0.01 = 0.014m$. After the wave has reached the wall, a standing wave with double amplitude should be created.