斐伊川における洪水観測について(2)-洪水時の河床形状の変化特性-

Abstract

The three-dimensional river-bed configurations were measured by a echo-sounder attached to a cross-type float which was tagged from the top of the bridge, and almost simultaneously, time series of photographs were taken of the flow patterns on the flow surface during a flood stage in the Hii River. Photograph data were analyzed by picture processing technique to obtain the mean velocity in water surface of flood flows.5 series of measurements were made from 1993 to 1995. In this paper, by using the obtained data, the characteristics of bed configulations and their time variations were examined in relation to the time variation of flow depth, resistance and velocity.