DEVELOPMENT OF NUMERICAL SIMULATION MODEL FOR RIVER BED VARIATION FOR RIVER MANAGEMENT AND MAINTENANCE

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Instead of computing vertical distributions of velocity and pressure intencity by 3D model, this study developed the semi-direct bottom velocity computation method for bed variation computation, in which equations of water surface velocity and horizontal vorticity are computed with shallow water equations. It is presented the method can reproduce bottom velocity fields resulted by complex 3D flow structures around river confluence or river structures. A bed variation computation by bottom velocity computation method can explain bed variation in the channel with structures and local scouring around structures. And we demonstrated the method is can be applied to compute river bed variation during flood events.