The time discretization used in TELEMAC2D is semi-implicit, with a Crank-Nicholson factor of 0.6.The equations are solved using Method of Characteristics, PSI distributive scheme and N distributive scheme for advection for flow velocities, water depth and tracers respectively.As for the PSI scheme, the Courant-Friedrichs-Lewy condition (CFL condition) must be considered for convergence, and commonly the Courant number should be less than 1.Therefore, in this study, the time step is set