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It is necessary to predict the effect of vegetation in the river channel on flood flow.In this study, a flow field in a compound meandering channel with vegetation along banks is simulated numerically by using three dimensional model with spectral method, which is effective to simulation of the flow field without vegetation. Result of simulation is compared with that of experiment. Simulation can describe distribution of water level and of velocity above the level of flood channel, but cannot velocity distribution in the lower layer and secondary flow. This model may not describe properly the mixing between fluid of low velocity near the vegetation and that in main flow. Other turbulence model may be necessary to describe the three dimensional flow field with vegetation.

STUDY ON NUMERICAL CALCULATION OF FLOW IN A COMPOUND MEANDERING CHANNEL WITH TI-LE FLOOD CONTROL VEGETATION