International Association For
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چکیده
nozzle and sediment determ ines the rate of scour . Under fully turbulent conditions, the re la~ive dimensions of the sccur hole d (:pend onl y upon the t ime pa rame ter and the ratio between the fictitious axial jer velocity a t the bed and the fa ll ve locity of the sediment particles. There exist two distinct values of this ratio, at which the eroding action of the jet becomes particularly effective.
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