A study on the numerical model of non-equilibrium sediment transport in unsteady flow

A fully coupled one-dimensional mobile-bed river model for the condition of unsteady flow and non-equilibrium sediment transport with looped network system is created. The governing equations are as follows: continuity, motion, conservation of material in suspension, conservation of bed-material, sediment transport formula and roughness equation. The above equations are solved simultaneously using the Preissmann implicit scheme. Manning roughness coefficient with the bed form (ripple and dune) considered by van Rijn method is calculated at each time step. Applying this fully coupled sediment transport model to Belley reservoir of Rhone river, total trap efficiency (=0.4) gives reasonably good result comparing with the measurement (=0.49).