Impact of Unfavorable Pressure Gradient and Vegetation Bed on Flow

摘要

Vegetation in free streams plays an important role in environmental hydraulic studies. Experiments were conducted in a flume with plexiglas walls and vegetated bed in the hydraulics lab with different flow discharges and flow depths. Results showed that the main velocity and main turbulence intensity as well as the Reynolds stress distributions were affected by the presence of vegetation in the channel but not by the variation of flow depth and discharge. The log law in the inner layer and the velocity defect law in the outer layer held reasonably over the vegetated bed under unfavorable (adverse) pressure gradient.