The ecohydrodynamic model for the Baltic Sea consists of two interacting parts:
one describes the hydrodynamics of the water (3HD), the other organic matter
production and destruction (ProDeMo).The results of the simulation were
validated.The modelled processes were compared with direct observations, which
demonstrated the recurrence of cycles, from the spring diatom blooms through the
summer depletion of nutrient salts and algal blooms, to autumn blooms of diatoms
and the subsequent destruction of organic matter, and intensified mineralisation
of detritus in winter.Ca libration yielded a set of coefficients complementing the
algorithm of equations describing the production and destruction of organic matter
in the coastal zone.V erification of the model has demonstrated that in multi-year
simulations it is stable and also that it follows the laws of conservation of mass
and energy.T he third procedural stage of the model investigation was validation,
in which statistical measures in the form of bias, correlation coefficients and
effectiveness between simulations and observations not used in calibration describe
the quality of ecohydrodynamic modelling in southern Baltic Sea waters
