Abstract
In open-channel flows with bed-load transport, mean flow properties and turbulence characteristics are affected by the bed load motions. In this study, FLDA measurements over the flat movable sand bed were conducted in open channel flows, and simultaneously the bed loads were collected and these volumes were measured. It was found that the mean velocity profile can be discribed by the log-law in the inner layer. In contrast, at the near bed region, the velocity profile deviates from the log-law. Turbulence intensity distributions, both horizontal and vertical, also change in the inner layer; the securves deviate upward from the exponential formula proposed by Nezu. The Reynolds stress profile near the bed is similar to that of a two dimensional uniform flow. The generation rate of turbulence defects in the near bed region. The phenomena are almost controlled by the bed-load motions.
