SWASH calculates the time-dependent evolution of the surface elevation, velocities (both horizontal and vertical), pressure and possibly
some turbulence quantities. It would require an excessive amount of disk space to the store these quantities at every grid
point for every time step. Therefore, the user has to make some decisions on what need to be outputted by SWASH.
One can make some tables of time series of surface elevation, velocities, discharges, pressures, turbulent kinetic energy, etc.
or time-averaged velocities and turbulence quantities or wave height and wave-induced setup at specified location points.
Alternatively, one may also output several quantities over the entire domain or a part of the domain at certain times
("snapshots"). They are stored as blocks in the Matlab binary files.
The user must determine the time duration over which the wave parameters, e.g. wave height and setup, mean current or mean turbulence quantities are computed; see command QUANT. This corresponds to the final stage of the simulation period, which should be long enough to establish steady-state conditions. This time duration, which should be long enough to provide statistically reliable data, equals the duration of the simulation minus the spin up time of the simulation; see Section 5.4.1.