A 3D hydrodynamic model calibration by means of friction coefficients adjusting is presented. The YAXUM3/D was originally developed in the Mexican Institute of Water Technology to study shallow lake hydrodynamics and applied to Patzcuaro Lake, Mexico. Different simulations tests were made in order to evaluate the 3D hydrodynamic model. Numerical simulations were made taking in account all, steady and cyclic winds, as well as initial wind of excitation for 24 h with posterior calm. The results showed that the hydrodynamics conditions repeat after 3 cycles, this means those three days of simulation are required to overcome the initial condition of calm. Wind forcing and bottom friction are the main mechanisms of the hydrodynamic and circulation patterns. Coefficients Cd, bottom friction (Chezy) as well as vertical eddy viscosity were estimated to describe the most realistic simulations describing the best adjustment between measurements and simulations in lake circulation were determined.
