How to Cite

Vasarmidis, P., Stratigaki, V., Suzuki, T., Zijlema, M., & Troch, P. (2020). AN INTERNAL WAVE GENERATION METHOD FOR THE NON-HYDROSTATIC MODEL SWASH. Coastal Engineering Proceedings, (36v), waves.16.


Numerical wave propagation models are commonly used as engineering tools for the study of wave transformation in coastal areas. In order to simulate waves in the nearshore zone correctly, the generation and absorption of waves at the boundaries of the models need to be modelled accurately. In numerical models, incident waves are usually generated by prescribing their horizontal velocity component at the boundary of the computational domain over the vertical direction. Additionally, in order to absorb and to prevent re-reflections in front of the numerical wave generator, a weakly reflective wave generation boundary condition is applied in which the total velocity signal is a superposition of the incident velocity signal and a velocity signal of the reflected waves. However, this method is based on the assumption that the reflected waves are small amplitude shallow water waves propagating perpendicular to the boundary of the computational domain and hence this method is weakly reflective for directional and dispersive waves. Within the present study, an internal wave generation method combined with sponge layers is applied in the non-hydrostatic model SWASH, in order to more accurately generate waves and avoid re-reflections at the boundaries.

Recorded Presentation from the vICCE (YouTube Link):


Vasarmidis, P., Stratigaki, V., Suzuki, T., Zijlema, M., Troch, P., 2020. On the accuracy of internal wave generation method in a non-hydrostatic wave model to generate and absorb dispersive and directional waves. Ocean Eng. 108303.

Vasarmidis, Stratigaki, Suzuki, Zijlema, Troch (2019): Internal Wave Generation in a Non-Hydrostatic Wave Model, Water, vol 11, p. 986.

Wei, Kirby, Sinha (1999): Generation of waves in Boussinesq models using a source function method, Coastal Engineering, vol 36, pp. 271–299.

Zijlema, Stelling, Smit, (2011): SWASH: An operational public domain code for simulating wave fields and rapidly varied flows in coastal waters, Coastal Engineering, vol. 58, pp. 992–1012.

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.