Abstract
A method to calculate suspended load is proposed for equilibrium and non-equilibrium conditions. The diffusion theory is conventional for these problems, but it is difficult to decide the concentration at a reference level and the diffusion coefficient of particle. In the present theory which is based on the stochastic analysis of motion of suspended particles and pick up rate, suspended load can be predicted without these parameters, and it is found to be useful in calculating non-equilibrium suspended load.
Pick up rate is studied for nonuniform sediment theoretically and experimentally by considering sheltering effect of gravels, and suspended load can be calculated for uniform and nonuniform sediment. Equilibrium concentration distribution and concentration at reference level which are calculated from the present model are compared with the previous results. Then, this method is applied to calculating non-equilibrium suspended load with armouring process.
