BBL coefficients and RK3 time stepping
Context
The computation of the coefficients for the bottom boundary layer (BBL) scheme of the modified leapfrog time-stepping scheme involves quantities (uu
, vv
, and gdept
) defined at time level Nmm
. In the RK3 version of the BBL scheme, these computations are unchanged, although quantities at time level Nmm
are no longer constant during the three stages of the RK3 integration.
Proposal
The computation of the BBL coefficients for RK3 time stepping should be reviewed to verify or ensure its validity.