Abstract
Numerical method of the solution of water quality equation for rivers is proposed on the basis of the method of characteristics. The movement of water in non-tidal or tidal rivers is simulated by solving the continuity equation and momentum equation for unsteady flows by the implicit finite difference method. Then, water quality changes are simulated along the trace of the movement of water by solving the water quality equation. The results of simulation of water quality are presented to understand the pollution process in tidal rivers.
