  The movement of water waves is a topic of interest to researchers from
different areas. While their propagation is described by Euler equations, there
are instances where simplified models can also provide accurate approximations.
A well-known reduced model employed to study the wave dynamics is the
Boussinesq model. Despite being extensively studied, to our knowledge, there is
no research available on a Boussinesq model featuring a sponge layer.
Therefore, in this work, we present a Boussinesq model with a sponge layer.
Furthermore, we carry out a numerical investigation to explore the advantages
and limitations of the proposed model. For this purpose, we compare the
numerical solutions of the model with and without the sponge in three different
scenarios. The numerical solutions are computed by a pseudospectral method. Our
results show that the Boussinesq model with a sponge layer is numerically
stable and advantageous because it is able to absorb low-amplitude waves,
allowing it to run the numerical simulations for long periods of time without
requiring a large spatial domain, but it is not able to absorb high-amplitude
waves.
