Hydraulic Jump Information for Engineers

With a Variety of Channel Sections

Except in a wide or rectangular channel, the final (downstream or sequent) depth after a hydraulic jump cannot be defined with certainty from knowledge of initial conditions upstream. To get a closer indication of the final depth, in each of six channel sections,   the Streamforce at the initial state just before the jump is evaluated. A process of iteration using depths greater than that upstream arrives at a value of Streamforce downstream virtually identical to the upstream value and a solution for the downstream depth. Every pip on the curves represents such a calculation.

Since this process ignores energy losses due to three dimensional effects the results give somewhat greater final depths than will occur in practice.  Readings from the graphs provide guidance.
- Dr Bill Dickens

 

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About Dr Bill Dickens

The author has taught and studied hydraulics for many years and has a particular interest in dimensions and the dimensionless approach to problems. With an MSc in hydraulics at Imperial College London, his PhD dealt with the problem of in-line vibration of piles brought dramatically to light during the construction of an oil terminal on the Humber. Since retiring he has taken an interest in computer programming and offers these two examples in the hope that they will be of use to Civil Engineers.