ABSTRACT
This chapter considers the influence of hydrodynamics on other important environmental parameters, often called transport modelling, including the motion of sediments and water-quality modelling. If the dissolved oxygen falls saturation, on exposure to the atmosphere the water will dissolve more oxygen to restore the balance. The oxygen balance of a river may be improved by using artificial aeration by aerators; alternatively, hydraulic structures using overfalls or hydraulic jumps also represent a possible source of local dissolved oxygen improvement. The chapter discusses some of the consequences of the approximations inherent in the development of a computational model of the processes. In many circumstances, a computational model with reduced spatial dimensionality will be used in engineering practice. Some parts of (applied) hydraulics developed from statements in the formulation and application of scaling laws, in mathematical modelling of various types of flow or engineering applications are best dealt with immediately before discussing the modelling procedure and problems.
