# Model state/output¶

The AeoLiS model state is described by a collection of spatial grid variables with at least one value per horizontal grid cell. Specific model state variables can also be subdivided over bed composition layers and/or grain size fractions. All model state variables can be part of the model netCDF4 output. The current model state variables are listed below.

```
('ny', 'nx') : (
'x', # [m] Real-world x-coordinate of grid cell center
'y', # [m] Real-world y-coordinate of grid cell center
'ds', # [m] Real-world grid cell size in x-direction
'dn', # [m] Real-world grid cell size in y-direction
'dsdn', # [m^2] Real-world grid cell surface area
'dsdni', # [m^-2] Inverse of real-world grid cell surface area
'alfa', # [rad] Real-world grid cell orientation
'uw', # [m/s] Wind velocity
'uws', # [m/s] Component of wind velocity in x-direction
'uwn', # [m/s] Component of wind velocity in y-direction
'tau', # [m/s] Wind shear velocity
'taus', # [m/s] Component of wind shear velocity in x-direction
'taun', # [m/s] Component of wind shear velocity in y-direction
'dtaus', # [-] Component of the wind shear perturbation in x-direction
'dtaun', # [-] Component of the wind shear perturbation in y-direction
'udir', # [rad] Wind direction
'zb', # [m] Bed level above reference
'zs', # [m] Water level above reference
'Hs', # [m] Wave height
),
('ny','nx','nfractions') : (
'Cu', # [kg/m^2] Equilibrium sediment concentration integrated over saltation height
'Ct', # [kg/m^2] Instantaneous sediment concentration integrated over saltation height
'q', # [kg/m/s] Instantaneous sediment flux
'qs', # [kg/m/s] Instantaneous sediment flux in x-direction
'qn', # [kg/m/s] Instantaneous sediment flux in y-direction
'pickup', # [kg/m^2] Sediment entrainment
'w', # [-] Weights of sediment fractions
'w_init', # [-] Initial guess for ``w''
'w_air', # [-] Weights of sediment fractions based on grain size distribution in the air
'w_bed', # [-] Weights of sediment fractions based on grain size distribution in the bed
'uth', # [m/s] Shear velocity threshold
),
('ny','nx','nlayers') : (
'thlyr', # [m] Bed composition layer thickness
'moist', # [-] Moisure content
'salt', # [-] Salt content
),
('ny','nx','nlayers','nfractions') : (
```