WRE 6 min prob 15

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andyrich

Andy
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In the water resources six minute solutions #15, they use the specific force method to solve this problem. Why is the specific force on each side of the hydraulic jump set equal? I was under the impression that energy is lost in a hydraulic jump?

 
In the water resources six minute solutions #15, they use the specific force method to solve this problem. Why is the specific force on each side of the hydraulic jump set equal? I was under the impression that energy is lost in a hydraulic jump?
There is no force applied to the fluid and therefore (by Newton's Law), momentum is conserved. The values of the conjugate depths on either side of a hydraulic jump are derived from a statement of equal momentum, not equal energy. Energy is indeed lost in a hydraulic jump, while momentum is conserved.

 
Okay thanks!

After doing a little more research I found a reference that indicates that the specific force on either side of a hydraulic jump is the same... the CERM did not point that out as far as I can tell...

 
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