HYDRAULIC JUMP IN A DIVERGING CHANNEL WITH AN ADVERSE SLOPE

In this research, the adverse hydraulic jump formed in a gradually expanding stilling
basin of rectangular cross section is investigated both theoretically and experimentally. The
experiments were conducted in a specially designed model for a wide range of bed slopes and
diverging angles of the basin walls in addition to classic jump for a wide range of Froude numbers.
A momentum-based theory is presented to determine the sequent depth ratio. The results show that
there is good agreement between theoretical and experimental data. Comparison of important
parameters of a diverging hydraulic jump on the adverse slope, such as length, sequent depth and
energy loss, with those in the classic jumps indicated that any increase in the adverse bed slope
and the diverging angle of basin wall would cause a reduction of the sequent depth and relative
length of jump and increase in the relative energy loss in comparison to the classical hydraulic
jump.