C $Header: /u/gcmpack/MITgcm/pkg/obcs/OBCS_OPTIONS.h,v 1.19 2017/06/11 01:36:56 dimitri Exp $
C $Name:  $

C CPP options file for OBCS package
C Use this file for selecting options within the OBCS package

#ifndef OBCS_OPTIONS_H
#define OBCS_OPTIONS_H
#include "PACKAGES_CONFIG.h"
#include "CPP_OPTIONS.h"

#ifdef ALLOW_OBCS
C Package-specific Options & Macros go here

C Enable individual open boundaries
#define ALLOW_OBCS_NORTH
#define ALLOW_OBCS_SOUTH
#define ALLOW_OBCS_EAST
#define ALLOW_OBCS_WEST

C This include hooks to the Orlanski Open Boundary Radiation code
#define ALLOW_ORLANSKI

C Enable OB values to be prescribed via external fields that are read
C from a file
#define ALLOW_OBCS_PRESCRIBE

C Enable OB conditions following Stevens (1990)
#undef ALLOW_OBCS_STEVENS

C Allow sponge layer treatment of open boundary conditions
#undef ALLOW_OBCS_SPONGE

C Include hooks to sponge layer treatment of pkg/seaice variables
#undef ALLOW_OBCS_SEAICE_SPONGE

C balance barotropic velocity
#define ALLOW_OBCS_BALANCE

C add tidal contributions to normal OB flow
C NOTE that at the moment tidal forcing is applied
C only to "normal" flow.
#undef ALLOW_OBCS_TIDES

C Use older implementation of obcs in seaice-dynamics
C note: most of the "experimental" options listed below have not yet
C       been implementated in new version.
#undef OBCS_UVICE_OLD

#ifdef OBCS_UVICE_OLD
C     The following five CPP options are experimental and aim to deal
C     with artifacts due to the low-frequency specification of sea-ice
C     boundary conditions compared to the model forcing frequency.
C     Ice convergence at edges can cause model to blow up.  The
C     following CPP option fixes this problem at the expense of less
C     accurate boundary conditions.
#undef OBCS_SEAICE_AVOID_CONVERGENCE

C     Smooth the component of sea-ice velocity perpendicular to the edge.
#undef OBCS_SEAICE_SMOOTH_UVICE_PERP

C     Smooth the component of sea ice velocity parallel to the edge.
#undef OBCS_SEAICE_SMOOTH_UVICE_PAR

C     Compute rather than specify seaice velocities at the edges.
#undef OBCS_SEAICE_COMPUTE_UVICE
#endif /* OBCS_UVICE_OLD */

C     Smooth the tracer sea-ice variables near the edges.
#undef OBCS_SEAICE_SMOOTH_EDGE

#endif /* ALLOW_OBCS */
#endif /* OBCS_OPTIONS_H */