Numerical movable-bed models for practical engineering

Abstract Numerical modelling of sediment transport phenomena is an ambitious aim, which can only be attained in the long term by first formulating simplified models. On the basis of practical experience, these may be subsequently refined to give better results. This paper describes some simplifications of the full set of governing equations associated with sedimentation processes under time-dependent flow conditions, such as those in tidal rivers. A numerical movable-bed model is presented which, although economical in its computer requirements, nevertheless simulates some of the complex three-dimensional physical effects. Results from practical applications are given and compared with both laboratory experiments and field investigations.