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Hydraulic characteristics of unsteady flows were investigated experimentally in compound channels with vegetated flood plains. Some noticeable differences between unsteady flow structure in compound channels with and without vegetation were revealed. The vegetation in the flood plains increases the unsteadiness of the main-channel velocity and its double peek property is changed by the effects of vegetation arrangement. During the rising stage, the velocity in the vegetation does not reach the value in the steady flow case so that the lateral velocity gradient and the turbulence intensity increase near the vegetation interface. Lastly, 1-D numerical calculation technique for unsteady flow with vegetation in flood plains was investigated.

Hydraulic Characteristics of Unsteady Flow in Compound Channels with Wooded Zones on Flood Plains