DEVELOPMENT OF SEDIMENT DISHCARGE MODEL OF RIVERS BY USING FILED DATA AND THE SIMPLE MODEL

Abstract

 Although the calculation of sediment discharge of rivers is very important technique, an accracy of them is not sufficient. In this study, a sediment discharge model of rivers by using filed data and the simple model considering cross-sectional shape of river was proposed by using observation results at the Goryo Brige of Tone River at floods. No-dimensional tractive force was calculated by using the Manning formula. It was slso estimated by using the ADCP data and the Logarythmic law of vertical profile of current velocity. The calculated force was revised by observation results. Furthermore, the revised tractive force was used to calculate the bedload transport ratio. The bedload ratio was also observed by using the bottom track speed of ADCP and the Egashira Flomula. According to other studies, the bedload layer velocity can be estimated by using the bottom track speed of ADCP. The calculated bedload transport ratio by using the revised tractive force was verified by using observation results. Finaly, moored riverboat oscillations were estimated by video analyses and effects of them were removed from bottom track speeds. Comparization between the bedload transport rate by using the conventional model and that by using the revised value considering moored riverboat oscillations revealed the improvement on account of correlation coefficients.