掃流砂礫が流れの流速分布におよぼす影響について

Abstract

The velocity distribution near the bed for bed-load laden flow diviates from astraight line in the semi-logarithmic plot on usual co-ordinate. The auther reasonedthat the diviation is due to a shear stress generated by the rotation of sand gravels.If a mass transport moves due to the gravel rotation, a momentum difference betweenthe upper and lower layer of the rotation axis results. The difference is the equivalentof shear force between the two layer. The total shear stress for the bed-load ladenflow consists of a turbulent and the gravel rotation's shear stress. By use of aboveconsideration, the velocity distribution can be obtained. It is shown that the velocitydistribution for hed-load laden flow is straight line of gradient I/ic in the semi-logarithmic plot on new co-ordinate. The experimental results permited that abovetheory is appropriateness.