NUMERICAL ANALYSIS OF INFLUENCE OF TIEJIWAN RECLAMATION PROJECT ON TIDAL FLOW AND SEDIMENT SILTATION IN SANDUAO BAY

摘要

In order to study the possible influence of the Tiejiwan Reclamation Project upon the tidal flow and the sediment siltation intensity in the Sanduao Bay, a two dimensional numerical model is developed that the depth-integrated tidal flow with the flood-ebb land moving boundary and the engineering sedimentation method is used. The Double-Sweep-Implicit finite-difference scheme is adopted to solve the momentum and continuity equations. Based on the verification of the present model, the reclamation-induced variations of the tidal discharge and flow velocity in the Sanduao Bay are studied. The annual siltation intensity, the final deposition thickness and the balance duration are computed. The changes of the tidal discharge, the diversion ratio, the velocity field and the annual siltation intensity would increase with the increase of the reclamation area. It is found that the diversion ratio of main branch channels has small changes, although the total tidal discharge would decrease 5%-8%, indicating that the change of the situation of shoals and channels would be small.