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EXPERIMENTAL APPROACH THE LENGTH OF THE ROLL SURFACE IN A HYDRAULIC JUMP CHANNEL PROFILEKeywords: Hydraulic jump , channal-shaped in U , stilling basin , channel bottom rough. Abstract: This study aims to experimentally evaluate an experimental approach to the length of the roller surface of the hydraulic jump controlled by threshold, moving in a channel profile 'U' rough bottom roughness for different tested. a functional relation ship in dimensionless term, linking the different characteristics of the projection, showing the effect of the roughness of the channel bottom was obtained
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