HYbrid Coordinate Ocean Model (HYCOM) model is a data-assimilative hybrid isopycnal-sigma-pressure (generalized) coordinate ocean model. The hybrid coordinate is one that is isopycnal in the open, stratified ocean, but smoothly reverts to a terrain-following coordinate in shallow coastal regions, and to z-level coordinates in the mixed layer and/or unstratified seas. The HYCOM effort is funded by the National Ocean Partnership Program (NOPP), as part of the U. S. Global Ocean Data Assimilation Experiment (GODAE).

HYCOM Consortium
http://hycom.rsmas.miami.edu