TRIAL OF SEDIMENT DISCHARGE MEASUREMENTS UNDER FLOODS IN THE HII RIVER

The river-bed configurations were measured by a echo-sounder attached to a cross-type float under floods in the Hii River which is the typical sand-bedded river in Shimane Prefecture. At the same time, time series of photographs were taken of the flow patterns on the flow surface, and the vertical distributions of the velocity and turbidity were also measured.In this paper, by using the data, moving velocities of dunes were obtained at every stage of the floods, and approximate estimations of discharge rate of bed load and suspended load were tried.