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Spillway Jet Regimes

Spillway jet regimes depend on the geometry, spill flow rate, and tailwater elevation:

  • Surface jet or skimming flow: In skimming flow, the momentum of the surface jet remains tangential to the free surface, minimizing the bubble transport to depth and the production of TDG.
  • Plunging flow: The plunging regime is observed in a spillway without deflectors or for low tailwater elevations. Water flowing over the spillway plunges deep into the stilling basin, forming a hydraulic jump. This regime transports bubbles to deep regions where high pressure forces their dissolution into water, resulting in the highest TDG production.
  • Submerged or surface jump: The submerged surface jet flow regime occurs during high tailwater elevations. A hydraulic roller forms above the jet, aerating the downstream water surface with potential of high TDG production.
Spillway jet regimes depend on the geometry, spill flow rate, and tailwater elevation.

Spillway jet regimes depend on the geometry, spill flow rate, and tailwater elevation.

Last modified on September 26th, 2012
Posted on March 14th, 2012