Initial conditions for this problem are a quiescent free surface and velocity field, and no stratification.
Stratification can be turned off by setting `beta`

to zero in `suntans.dat`

. This is because the equation
of state, as given in `suntans/main/state.c`

is linear and only requires `beta`

to convert from
salinity to density. Note that when `beta`

is zero, advection of salinity is also not computed, which can
save on computation time.

2014-08-06