Discussion of “A 2DH nonlinear Boussinesq-type wave model of improved dispersion, shoaling, and wave generation characteristics” by Chondros and Memos

Abstract The procedure proposed by Chondros and Memos [Chondros and Memos, 2014, A 2DH nonlinear Boussinesq-type wave model of improved dispersion, shoaling, and wave generation characteristics, Coast. Eng ., 91: 99–122] for improving dispersion, shoaling and wave generation characteristics of a 2DH Boussinesq-type wave model is discussed. We realize that the rationale behind utilizing variable coefficients in Boussinesq equations is not valid for natural waves and the technique of using surface elevation to obtain wave number in numerical simulation is inaccurate. In addition, the numerical examples provided in the paper are also not convincing.