MEMO solves the conservation equation for mass, momentum and several scalar quantities in terrain-influenced coordinates. Non-equidistant grid spacing is allowed in all directions. The numerical solution is based on second- order discretization applied on a staggered grid. Special care is taken that conservative properties are preserved within the discrete model equations. Advective terms are treated in MEMO with a monotonicity- preserving discretization scheme with only small implicit diffusion.
Turbulent diffusion is described with a two- equation turbulence model.
The surface temperature over land is computed from the surface heat budget equation. The soil temperature is calculated by solving a none- dimensional heat conduction equation for the soil. At lateral boundaries generalized radiation conditions are implemented. The current standard version of MEMO allows performing nested grid simulations. References Flassak Th.