Steady State Overtop Testing – Hydraulic Jump

Hydraulic Jump Testing was performed at the Hydraulics Laboratory at Colorado State University – Engineering Research Center (CSU) on the HydroTurf® Revetment System. The objective of the hydraulic jump test program was to quantify the performance of HydroTurf under the hydraulic loading caused by a range of hydraulic jumps at various overtopping depths.

A manually operated vertical sluice gate was installed in the flume to create a hydraulic jump on the lower third of the HydroTurf. Continuous flow was set at overtop depths of up to 5.0 ft. After a flow interval for each specific hydraulic jump, the sluice gate was adjusted to move the jump upstream. This produced a wide range of energy environments in order to generate an envelope curve for the energy and Froude ratios. Also, the HydroTurf was shown to disspiate over 120 horsepower.

Section of the Installed HydroTurf System in the Overtopping Flume for Hydraulic Jump Testing

Illustration of Section of the Installed HydroTurf System in the Overtopping Flume for Hydraulic Jump Testing

Section of the Installed  HydroTurf System in the Overtopping Flume for Hydraulic Jump Testing

Hydraulic Jump Testing of HydroTurf at CSU

Hydraulic Jump Testing of HydroTurf at CSU

Hydraulic Jump Testing of HydroTurf at CSU

It should be noted that a maximum performance threshold was not reached since there was no instability, deformation, loss of intimate contact, or damage of the HydroTurf system and since there was no erosion of the underlying subgrade.

Pressurized “Jet” Downstream of Gate

Pressurized “Jet” Downstream of Gate

Pressurized “Jet” Downstream of Gate

Since the sluice gate had a small opening at the base, the flow immediately downstream of it was a pressurized “jet” surging onto the HydroTurf™ System. At the location of this extremely turbulent jet flow, there was no instability, deformation, loss of intimate contact, or damage of the HydroTurf™ system, and there was no erosion of the underlying subgrade. The velocity at this location was calculated to be a minimum of 35 fps.