By chosing the compiler option SLICE_MODEL it is possible to operate GETM as a two-dimensional vertical (-)model under the assumption that all gradients in -direction vanish. In order to do so, a bathymetry file with a width of 4 grid points has to be generated, with the outer (, ) bathymetry values set to land, and the two inner ones being independent on . The compiler option SLICE_MODEL then sets the transports, velocities, and sea surface elevations such that they are independent of , i.e. they are forced to be identical for the same -index. Especially, the -transports and velocities in the walls (, ) are set to the calculated value at index .