Svašek Hydraulics

Coastal, harbour and river engineering consultants

Simulating WAves till SHore

    Delft University of Technology

    Wave propagation in coastal
    areas, including frequency
    dispersion, shoaling, refraction,
    diffraction, bottom friction,
    partial reflection, transmission
    and nonlinear wave-wave


SWASH is a general-purpose numerical tool for simulating unsteady, non-hydrostatic, free-surface, rotational flow and transport phenomena in coastal waters as driven by waves, tides, buoyancy and wind forces. It provides a general basis for describing wave transformations from deep water to a beach, port or harbour, complex changes to rapidly varied flows, and density driven flows in coastal seas, estuaries, lakes and rivers. It is continuously being developed by Delft University of Technology, the Netherlands.

SWASH accounts for the following physical phenomena:

  • wave propagation, frequency dispersion, shoaling, refraction and diffraction
  • nonlinear wave-wave interactions (including surf beat and triads)
  • wave breaking
  • wave runup and rundown
  • moving shoreline
  • bottom friction
  • partial reflection and transmission
  • wave interaction with structures
  • wave-current interaction

  • wave-induced currents
  • vertical turbulent mixing
  • subgrid turbulence
  • wave damping induced by aquatic vegetation
  • rapidly varied flows
  • tidal waves
  • bores and flood waves
  • wind driven flows
  • space varying wind and atmospheric pressure
  • density driven flows
  • transport of suspended load for (non)cohesive sediment
  • turbidity flows
  • transport of tracer