A study was carried out of the influence of the horizontal pressure gradient in inland water bodies (lakes and reservoirs) on the processes of formation of concentrations of dissolved gases. A three-dimensional hydrostatic model and a one-dimensional model based on averaging of three-dimensional equations over a horizontal section of a reservoir and complemented by parametrization of the pressure gradient to take into account gravitational oscillations (seiches) were used as tools for carrying out calculations. Based on the results of the numerical experiments, it can be concluded that the use of parameterization is of fundamental importance for describing the formation of concentrations of dissolved gases: turning off the pressure gradient in the model gives results corresponding to the Cato–Phillips formulation and does not allow one to correctly reproduce the distribution of gases in reservoirs of finite size. Parameterization of the influence of pressure gradient and horizontal diffusion in the one-dimensional LAKE model allows one to reproduce biogeochemical processes with sufficient accuracy, in accordance with the reference results obtained using the full three-dimensional model.
D.S. Gladskikh (Wed,) studied this question.