ABSTRACT
This chapter deals with models for dissolved substances’ transport, water quality and sediment movement in open channels. The reader is assumed to have mastered the basis of open–channel modelling. The solving asolute–transport problem involves computing the concentration in the dissolved substance at all points at all times of the open–channel system. The chapter not provides a detailed description of the theory of non–uniform sediment motion but also presents the dynamics of morphological flows as well as basic considerations on their modelling. The physical modelling of morphological processes will obviously be closely connected with models of open-channel flow with fixed boundaries and incorporate the procedures outlined there with the additional conditions governing the introduction of a movable bed required to simulate sediment transport. The time scale of morphological processes will not be the same as that for water movement as it will depend on the speed of sediment transport.
