Ponte Academic Journal Feb 2021, Volume 77, Issue 2 |
CINEMATIC AND PHYSICAL CHARACTERISTICS STUDY OF HYDRAULIC JUMP B TYPE IN SLOPPING RECTANGULAR CHANNEL WITH NEGATIVE STEP Author(s): Marouf Nadir ,Bemamar Saadia Benmamar, Remini Boualem J. Ponte - Feb 2021 - Volume 77 - Issue 2 doi: 10.21506/j.ponte.2021.2.5 Abstract: The hydraulic jump, B type with negative step in sloping rectangular channel is
investigated theoretically and experimentally. A function relationship is defined linking the
various parameters which influence the phenomenon. The cinematic and physical
characteristics of the jump as its velocities, sequent depths, length, water surfaces and
efficiency are analysed.
At the negative step start, an undisturbed jet is fully developed caused near the fall of the
negative step at very high speeds, which can exceed 150cm/s. In the vortex area, negative
speeds are obtained for different cases of slopes studied. The results also show an exponential
increase in sequent depth with the increase in the Froude number (F1). The roller relative
length (Lr / h1) increases proportionally in a linear fashion with the channel slop increase (θ)
and the step height (S). The yield obtained from the jump studied for the entire study range
justifies the effectiveness of the forced hydraulic jump B type with negative step in energy
dissipation.
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