**4.3 Results of hydrodynamics simulations**

The simulation represents 30 days corresponding to dry and rain season. The numerical integration time or time step was, ∆t = 2.0 s. Fig. 11 shows the obtained result for resultant velocity.

A Study Case of Hydrodynamics and Water Quality Modelling: Coatzacoalcos River, Mexico 63

The following figures show the model results for these water quality parameters.

Fig. 12. Discharge scenario

Fig. 13. Temperature simulations over time

Fig. 11. Velocity contours of Coatzacoalcos River (rain and dry season) over time
