Local Scour Caused by Submerged Square Jets under Model Ice Cover

“…This ice cover can, however, act like a lid, causing pressurized flow and increased risk of scour. Flume studies of gate releases have shown that scour depths and widths downstream of gates are the same size or larger when they occur under a simulated ice cover (Sui et al 2009). This same effect could occur in other areas where ice jams or shore-fast ice have narrowed and concentrated the flow into a jet.…”

Section: Hydropower Flood-control and Other Damsmentioning

confidence: 99%

Validation of modeling flow approaching navigation locks

Carr¹,

Dahl²

2017

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Ice in navigation channels and around structures can cause significant damage that requires expensive repairs. This damage can also trigger delays that have the potential to disrupt the entire navigation system, well beyond the reach of the stretches of water directly impacted by ice. One example is upstream of Melvin Price Lock and Dam where ice-induced scour was repaired at a cost in excess of $1,000,000 and the scour hole reappeared within a year of the repair. Therefore, this report outlines the risks to navigation and structures, including a review of the available literature.

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“…They also noted that the depth of scour holes around bridge piers increases with the increase in the roughness of model ice cover. Sui et al (2009) assessed the scour patterns caused by submerged jet under conditions of open flow, smooth ice-covered flow and rough ice-covered flow. Their results showed that the scour depth under rough ice-covered condition exceeds that under the open flow condition and that decreasing the flow depth increases the scour depth.…”

Section: Introductionmentioning

confidence: 99%

Local scour around a bridge pier under ice-jammed flow condition – an experimental study

Wang

Hou

Sun

et al. 2021

Journal of Hydrology and Hydromechanics

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The appearance of an ice jam in a river crucially distorts local hydrodynamic conditions including water level, flow velocity, riverbed form and local scour processes. Laboratory experiments are used for the first time here to study ice-induced scour processes near a bridge pier. Results show that with an ice sheet cover the scour hole depth around a bridge is increased by about 10% compared to under equivalent open flow conditions. More dramatically, ice-jammed flows induce both greater scour depths and scour variability, with the maximum scour depth under an ice-jammed flow as much as 200% greater than under equivalent open flow conditions. Under an ice-jammed condition, both the maximum depth and length of scour holes around a bridge pier increase with the flow velocity while the maximum scour hole depth increases with ice-jam thickness. Also, quite naturally, the height of the resulting deposition dune downstream of a scour hole responds to flow velocity and ice jam thickness. Using the laboratory data under ice-jammed conditions, predictive relationships are derived between the flow’s Froude number and both the dimensionless maximum scour depth and the dimensionless maximum scour length.

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Local Scour Caused by Submerged Square Jets under Model Ice Cover

Cited by 20 publications

References 6 publications

Scour Caused by Wall Jets

Scour Caused by Wall Jets

Validation of modeling flow approaching navigation locks

Local scour around a bridge pier under ice-jammed flow condition – an experimental study

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