You've mislabelled things a bit. It seems like you think that the hydraulic jump is the water diving down over the top of the weir. In fact the hydraulic jump is the turbulent jump in water surface elevation that you finally see moving up from downstream; that which you labelled a "submerged hydraulic jump". It's not a submerged hydraulic jump until it moves all the way up to the weir.
@fwengsolutions I'm the author of the video, and you're right. I was taught that a change in flow regime (e.g. subcritical to critical) was hydraulic jump, but I see that the definition is restrictied the way you describe, thanks for the correction.
@argongemini I guess I'd add a wetting surface (at the foot of the weir, unless there are more spillway rules) to create turbulence from the jump, or add cycloidal forms to throw pressure (merely) consistent with depth against what peeps call backwash; or, concentrate that submerged hydraulic jump/roller, add radial vanes and call it the observation pad. More love for the camera station crew.
You've mislabelled things a bit. It seems like you think that the hydraulic jump is the water diving down over the top of the weir. In fact the hydraulic jump is the turbulent jump in water surface elevation that you finally see moving up from downstream; that which you labelled a "submerged hydraulic jump". It's not a submerged hydraulic jump until it moves all the way up to the weir.
fwengsolutions 1 year ago 6
@fwengsolutions I'm the author of the video, and you're right. I was taught that a change in flow regime (e.g. subcritical to critical) was hydraulic jump, but I see that the definition is restrictied the way you describe, thanks for the correction.
gravelbar 3 weeks ago
question mate, how will you design a spillway to counter the submerged jump?
argongemini 2 years ago
@argongemini I guess I'd add a wetting surface (at the foot of the weir, unless there are more spillway rules) to create turbulence from the jump, or add cycloidal forms to throw pressure (merely) consistent with depth against what peeps call backwash; or, concentrate that submerged hydraulic jump/roller, add radial vanes and call it the observation pad. More love for the camera station crew.
Cineenvenordquist 8 months ago