BEDLOAD MEASUREMENT BASED ON THE CELERITY OF DUNE

Abstract

 In this study, the authors proposed the bedload velocity measurement method using celerity of water surface configuration due to dune. The method is constructed by using two definitions of bedload rate, one is for use dune’s height and its celerity u_w, the other is for bedload thickness and its velocity u_b. Comparison of the definitions shows bedlaod velocity is necessary for bedlaod measurement. The proposed method needs celerity u_w, wave heigh/depth ratio and water surface slope at crest. The estimated bedload velocity using the author’s method is plus-minus 50% by the measured value by ADCP. Among the factors, most dominant factor is u_w. STIV method is appropriate method for measuring u_w because the method can measure dominant dunes excepting bed small fluctuation.