SEDIMENT-CLOUD BASED MODEL OF SUSPENSION OVER RIPPLE BED DUE TO WAVE ACTION

Hitoshi Gotoh, Tetsuro Tsujimoto, Hiroji Nakagawa

Abstract


Sediment cloud, which is released periodically from the crest of ripples, plays a very important role in suspension over a ripple bed under the wave action. By considering the special role of the sediment cloud, suspension is divided into two subprocesses: (i) the transition process from bed-load motion to suspension as the entrainment of the sediment cloud; and (ii) the diffusion process of suspended sediment released from the sediment cloud. The trajectory of the sediment cloud is calculated by Lagrangian approach in the flow field solved by k-e model of turbulence. The suspended sediment concentration is simulated by solving a diffusion equation which has the source term due to sediment cloud.

Keywords


rippled bed; sediment cloud; sediment model

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