UNSTEADY BEHAVIOR OF DUNES.

Abstract

In alluvial streams, several kinds of sand waves are formed, and their scales and behaviours severely affect sediment transport rate and hydraulic resistance. Hence, it is very important on designing of hydraulic structures to estimate the behaviours of sand waves. The resistance law of flow in alluvial streams and the geometrical properties of sand waves have been investigated by many hydraulic researchers, and several prediction formulas have been proposed. These predictions are discussed in the paper.