2008 Volume 52 Pages 595-600
Effect of shape of sediment size distribution on alternate bar geometry is discussed by use of linear bed stability analysis and numerical analysis. Normal distribution, Talbot distribution, and bimodal distribution are chosen for sediment size distributions in the analysis. The results show that bar geometry on bed with bimodal type sediment has large difference from the others. Normal distribution with wide sediment size range is also tested and regularity of bar geometry is improved. Furthermore, bed load layer model is applied for reproduction of alternate bars and compared the results to those by exchange layer model. Spatiotemporal change of layers thickness is considered in bed load layer model and makes difference of reproduced bed geometry between two models.
