Incipient Motion of Non-Cohesive Sediment under Ice Cover — An Experimental Study

Wang, Jun; Sui, Jueyi; Karney, Bryan W.

doi:10.1016/s1001-6058(08)60036-0

Cited by 42 publications

(40 citation statements)

References 9 publications

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“…Generally, the maximum flow velocity is close to the surface with the smallest resistance coefficient. In the case of narrow river channels or near river banks, the maximum flow velocity will not occur at the surface but rather slightly below the surface due to the resistance forces of the side banks (Wang et al, 2008). The velocity profile under ice conditions also depends on the relative roughness of the ice.…”

Section: Flow Hydraulics Of Open Channel and Ice Covered Conditionsmentioning

confidence: 99%

“…The velocity profile under ice conditions also depends on the relative roughness of the ice. Wang et al, (2008) examined the location of the maximum velocity under rough ice cover, smooth ice cover and open channel flow ( Figure 2). As the ice resistance increases (from smooth ice to rough ice cover), the maximum flow velocity moves closer to the channel bed.…”

Section: Flow Hydraulics Of Open Channel and Ice Covered Conditionsmentioning

confidence: 99%

“…Since ice cover imposes an added boundary on flow conditions, the incipient motion of sediment under ice cover is different than for open channel flow. Wang et al (2008) conducted a number of clear water flume experiments examining the relationship between incipient motion of bed material and ice cover conditions. Since near-bed velocity is higher under ice covered conditions, a higher shear stress is exerted on the river bed under ice covered conditions (Wang et al, 2008).…”

Section: Incipient Motion Of Frazil Icementioning

confidence: 99%

“…Wang et al (2008) conducted a number of clear water flume experiments examining the relationship between incipient motion of bed material and ice cover conditions. Since near-bed velocity is higher under ice covered conditions, a higher shear stress is exerted on the river bed under ice covered conditions (Wang et al, 2008). The threshold velocity for the incipient motion of sediment under ice cover decreases as the ice cover resistance increases.…”

Section: Incipient Motion Of Frazil Icementioning

confidence: 99%

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Sediment Transport under Ice Conditions

Hirshfield¹,

Sui²

2011

Sediment Transport

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Section: Flow Hydraulics Of Open Channel and Ice Covered Conditionsmentioning

confidence: 99%

Section: Flow Hydraulics Of Open Channel and Ice Covered Conditionsmentioning

confidence: 99%

Section: Incipient Motion Of Frazil Icementioning

confidence: 99%

Section: Incipient Motion Of Frazil Icementioning

confidence: 99%

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Sediment Transport under Ice Conditions

Hirshfield¹,

Sui²

2011

Sediment Transport

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“…In the past, some researchers pointed out that the accumulation of frazil particles under ice cover should be similar to the motion of bed load on riverbed (Pariset and Hausser, 1961;Ettema 2002;Wang et al, 2008). Starosolszky (1970) and Sui et al (2000) suggested that the theory of bed load movement could be borrowed to describe the movement of ice under ice cover.…”

Section: Computational Domain For Body-fitted Coordinate Systemmentioning

confidence: 99%

Numerical simulations of ice accumulation under ice cover along a river bend

Sui

Chen

2008

Int. J. Environ. Sci. Technol.

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ABSTRACT:In this paper, the k -έ two-equation turbulence model has been used to simulate ice accumulation under ice cover along a river bend. A 2D depth-averaged numerical model has been developed in a nonorthogonal coordinate system with nonstaggered curvilinear grids. In this model, the contravariant velocity has been treated as an independent variable. To avoid the pressure oscillation in the nonstaggered grids, the momentum interpolation has been introduced to interpolate variables at the interface. The discretization equations have been solved by using pressure correction algorithms. An equation has been developed for describing the deformation of ice jam bottom. The thickness distribution of ice accumulation (ice jam) along the bend has been simulated. The developed model has been applied to the experimental studies under different conditions carried out at the Hefei University of Technology. Results indicate that all simulated thickness of ice accumulation agrees reasonably well with the measured thickness of ice accumulation in laboratory.

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The effects of ice cover on flow characteristics in a subarctic meandering river

Lotsari

Kasvi

Kämäri

et al. 2017

Earth Surf Processes Landf

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The effects of ice cover on flow characteristics in meandering rivers are still not completely understood. Here, we quantify the effects of ice cover on flow velocity, the vertical and spatial flow distribution, and helical flow structure. Comparison with open‐channel low flow conditions is performed. An acoustic doppler current profiler (ADCP) is used to measure flow from up to three meander bends, depending on the year, in a small sandy meandering subarctic river (Pulmanki River) during two consecutive ice‐covered winters (2014 and 2015). Under ice, flow velocities and discharges were predominantly slower than during the preceding autumn open‐channel conditions. Velocity distribution was almost opposite to theoretical expectations. Under ice, velocities reduced when entering deeper water downstream of the apex in each meander bend. When entering the next bend, velocities increased again together with the shallower depths. The surface velocities were predominantly greater than bottom/riverbed velocities during open‐channel flow. The situation was the opposite in ice‐covered conditions, and the maximum velocities occurred in the middle layers of the water columns. High‐velocity core (HVC) locations varied under ice between consecutive cross‐sections. Whereas in ice‐free conditions the HVC was located next to the inner bank at the upstream cross‐sections, the HVC moved towards the outer bank around the apex and again followed the thalweg in the downstream cross‐sections. Two stacked counter‐rotating helical flow cells occurred under ice around the apex of symmetric and asymmetric bends: next to the outer bank, top‐ and bottom‐layer flows were towards the opposite direction to the middle layer flow. In the following winter, no clear counter‐rotating helical flow cells occurred due to the shallower depths and frictional disturbance by the ice cover. Most probably the flow depth was a limiting factor for the ice‐covered helical flow circulation, similarly, the shallow depths hinder secondary flow in open‐channel conditions. Copyright © 2016 John Wiley & Sons, Ltd.

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Incipient Motion of Non-Cohesive Sediment under Ice Cover — An Experimental Study

Cited by 42 publications

References 9 publications

Sediment Transport under Ice Conditions

Sediment Transport under Ice Conditions

Numerical simulations of ice accumulation under ice cover along a river bend

The effects of ice cover on flow characteristics in a subarctic meandering river

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