EFFECTS OF THE INTRODUCTION OF SEEPAGE ON THE BED STABILITY AND TURBULENCE CHARACTERISTICS IN AN OPEN CHANNEL FLOW

A comprehensive study was carried out to understand the effects of seepage on the turbulence characteristics of flow in an open channel. To this end, both suction and injection seepage tests were conducted covering a range of seepage rates. The tests were conducted at two different flow rates (450 GPM and 720 GPM) corresponding to Reynolds number 31,000 and 47,500 respectively. The variables of interest include the mean velocity, turbulence intensity, Reynolds shear stress, shear stress correlation and higher-order moments. It was seen that the seepage causes a significant change in mean velocity profile and the magnitude of this change depends on the seepage rate. Seepage also affects bed stability with injection increases the bed stability, whereas suction causes a reduction. The results show that the effect of seepage on velocity and turbulence characteristics is not restricted to the near-bed region but can be seen throughout the flow depth.

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