BED UPWARD SEEPAGE EFFECTS ON SCOUR DIMENSIONS DOWNSTREAM OF FREE FALLING JETSS.M.R. Nabavit1 and M. Shafai Bejestan2Abstract Free falling jets occur in many river and dam site. Scour downstream of this structure can lead to failure of the structures. Over the past decades the effect of different variables on these phenomena has been studied, however the effect of upward seepage is not well known. In this paper the result of an experimental investigation on the characteristics of the scour hole downstream of a free falling jet with presence of upward seepage through the bed is presented. Experiments were run over beds of sediments (median sizes = 1.5, 2.4 and3.15 mm) under different flow discharge. The characteristic lengths of the scour hole determined from the scour profiles are: The horizontal distance of the location of maximum scour depth from the lower wall of weir XS, the point bar height hd, and the horizontal distance of the point bar crest from the lower wall of weir XD.
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