In applied fluvial geomorphology, dunes are important bed forms and significantly influence the features of turbulence. The effect of gravel dunes on a turbulent flow is important in determining the formation of bed forms, resistance to flow and sediment traort in coarse-bed rivers. Also Vegetation exists widely in natural river systems, especially in flood plains. The turbulent flow structures over fixed 2D dunes have been investigated by many scientists. However, no research has been reported about the interaction of bed form and vegetated channel banks on flow structure. In this study, the influence of the bed forms and vegetation on channel banks on velocity, Reynolds stress distributions and turbulent intensities have been investigated. The experiments have been carried out in a recirculating flume at the Hydraulics laboratory of Isfahan University of technology in Iran. The flume is 8 m long, 0.4 m wide and 0.6 m deep. The stems of rice with a median diameter of 2.7 mm were used to simulate vegetation on flume walls. In total, 4 runs were selected. In the first case, the influence of vegetation on flume walls and flat bed on location of fully developed flow has been investigated. In the second and third case, experimental measurements have been conducted over the fifth and sixth dunes in a series of seven of 2-dimensional asymmetric gravel dunes which the 0.08m height and the 0.96 m wavelength was preserved constantly and the chosen slip face for lee side were respectively 28? ?and 35?. The influence of different angles of lee slope of gravel dunes on the characteristics of flow in vegetated flume has been discussed. In the final case, conditions were similar with the second case only the vegetation was removed. The dunes have been built with graded gravel particles which have a median diameter of d 50 =10 mm. The mean flow depth ( h ) is kept constant as 20 cm for all the experiments. The experiments are performed with a discharge Q = 0.024 m 3 /s. A down looking acoustic Doppler velocimeter (ADV) has been used to measure the instantaneous three-dimensional velocity components. Velocities have been recorded for each point with a sampling frequency of 200 Hz. and the sampling volume of 5.5 mm. The sampling duration at each point was 120 seconds. A total of 7 velocity profiles in first Run, 20 velocity profiles in second Run, 22 velocity profiles in third Run and 16 velocity profiles in first Run were taken. Ultimately, more than 44 millions velocity data were collected. The results show that when flow separation commences, streamlines are directed towards the bed and very Key Words Gravel dune, Lee-slope angle of dune, Vegetated walls, Reynolds stress, Turbulence intensities.