Introduction - Computational River Dynamics - page 10

modeling approaches that are widely used in computational river dynamics. Chapter 6
explains the depth-averaged and width-averaged 2-D models for flow and sediment
transport. It also includes a discussion of the enhancement of the depth-averaged 2-D
model in order to take the effects of secondary flows in curved channels into account.
Chapter 7 illustrates the 3-Dmodeling approaches for turbulent flow, general sediment
transport in rivers, and local scour around in-stream hydraulic structures. Chapter 8
covers the general techniques used to integrate and couple various models, such as
domain decomposition; the coupling of 1-D, 2-D, and 3-D channel models; and the
integration of channel and watershed models. Chapters 9 12 introduce several special

topics related to river engineering, such as dam-break fluvial processes, vegetation
effects on fluvial processes, cohesive sediment transport, and contaminant transport.
This topic is one of the first to present a complete picture of the physical principles
and numerical methods used in computational river dynamics. It covers the funda-
mentals of flow and sediment transport in rivers, including many newly developed
non-uniform sediment transport formulas. It is unique in presenting multidimen-
sional numerical models, including 1-D, depth-averaged 2-D, width-averaged 2-D, and
3-D models, as well as integration and coupling of these models. It introduces many
recently developed numerical methods for solving open-channel flows, such as the
SIMPLE(C) algorithms with Rhie and Chow's momentum interpolation method on
non-staggered grids, the projection method, and the extended stream function and
vorticity method. It presents state-of-the-art sediment transport modeling approaches,
such as non-equilibrium transport models, non-uniform total-load transport mod-
els, and semi-coupled and coupled procedures for flow and sediment calculations.
It includes many engineering applications, such as reservoir sedimentation, channel
erosion (due to dam construction), channel widening and meandering, local scour
around in-stream hydraulic structures, vegetation effects on channel morphodynamic
processes, and cohesive sediment transport.

−