Abstract:
This paper uses the homotopy perturbation method for the analytical solution of groundwater table fluctuations, in response
to the tidal boundary condition, for a coastal unconfined aquifer with sloping beach face. The Boussinesq equation for
sloping beach contains two non-linear terms. The governing equation is reconstructed in homotopic form with two virtual
perturbation parameters and an auxiliary term. The secular terms generated from the non-linear diffusion term and the
slope term are eliminated by using parameter expansions based on two virtual parameters. Two non-dimensional parameters
emerge from the solution in the process of eliminating secular terms: (i) parameter equivalent to amplitude parameter and (ii)
parameter representing beach slope. The second-order (starting from zeroth-order) solution is presented. The higher-order
solution efficiently captures the non-linearity of the problem.