1994 Volume 38 Pages 739-746
The three-dimensional configurations of river bed were measured by a echo sounder, and, at almost the same time, time series of photographs were taken of the patterns of tracers scattered on the flow surface during a flood stage in the Hii River.
Photograph data were analyzed by picture processing technique to obtain velocity vectors. The relationships among streamlines, vorticity and divergence calculated from the obtained velocity vectors were examined.
The characteristics of wave height and wave length of dunes and small scale bars measured during the decreasing stage of flood flow are examined. The height of small scale bars increases while one of dunes decreases during the stage.
