2000 Volume 44 Pages 777-782
he present study describes field surveys of bed material, findings based on surveyed data and bed variation in a downstream reach, 0km to 37km, of the Kizu River. Field data realize that the river bed elevation changes longitudinally like riffle-pool bed profiles, coarse gravel are dominant in the riffle region, sand particles are deposited deep in the pool region, and sediment particles of pool region are transported from upstream as over-passing load or as selectively entrained sediment on riffle bed. The formula of grain size distribution which is employed in numerical simulation of river bed variation as the upper boundary condition of the study reach is proposed, taking account for the difference between grain sizes in riffle and pool regions as well as for characteristics of bed load transport such as over-passing load.
