ABSTRACT
Hokkaido University, Sapporo, Japan
ABSTRACT: Morphodynamic behavior of river-bed features and channel geometry such as ripples, dunes,
sand bars, bank erosion, deposition etc is significant in evaluation of flow resistance and other characteristics
associated with river environments; however this aspect of river engineering practice has been given relatively
little attention, and there is no existing tool for making physically based prediction of geometric characteristics
of such bedforms and channel geometry as well as total flow resistance induced by them for arbitrary steady
or unsteady flow condition. Brief description of several different morphodynamic numerical models has been
presented within the scope of this lecture. These models are capable of simulating vertical and horizontal two-
dimensional features of microscale and mesoscale bedforms, and bank deformation for steady or temporally
varying flows. In this work, attention has been given to the evolution of bedforms, sand bar and channel geometry
itself under temporally varying flows.
