抄録
Recently, various tools have been developed to predict flow and bed variation in alluvial rivers. The basic theory of these tools are based on the erodible bed condition in which the sediment transport rate can be calculated by the local equilibrium bed shear stress. However, non-erodible layers are often seen in the rivers as natural bed rocks or artificial structures. Models to calculate the bed variation including non-erodible layers are not established and it required from the engineering purposes. In this paper, methods to predict sediment transport rate and bed variation over non-erodible layers are studied. Several methods are tested in uniform grain size bed condition and mixture grain size condition in the Ishikari River. It is found that a method proposed by Struiksma (1999), in which sediment transport rate is adjusted depends on the bed condition, can be powerful for the calculation including non-erodible layers.
