Boundary Shear Stress in an Ice-Covered River during Breakup

Zare, Soheil Ghareh Aghaji; Moore, Stephanie A.; Rennie, Colin D.; Seidou, Ousmane; Ahmari, Habib; Malenchak, Jarrod

doi:10.1061/(asce)hy.1943-7900.0001081

Cited by 16 publications

(19 citation statements)

References 30 publications

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“…In other words, the momentum exchanges are intense at the canopy-gap interface. In addition, Zare et al (2016) confirmed that the shear stress varied dynamically with transformation of the ice cover, and the upper boundary shear stress is many times larger than the lower boundary shear stress during the solid ice cover to the ice cover removal, which is strongly similar to the gaps of vegetation cover. Therefore, the maximum of shear stress occurred at the water-vegetation interface, and the location of zero shear stress is close to the bed region in terms of the linear distribution.…”

Section: Tablementioning

confidence: 62%

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Modeling streamwise velocity and boundary shear stress of vegetation-covered flow

Han

Chen

et al. 2018

Ecological Indicators

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Section: Tablementioning

confidence: 62%

“…This finding is similar to the results of Attar and Li. (2013) and Zare et al (2016). The reason maybe is the intense turbulence caused by the vegetation gaps and the broken up ice.…”

Section: Shear Stressmentioning

confidence: 99%

Modeling streamwise velocity and boundary shear stress of vegetation-covered flow

Han

Chen

et al. 2018

Ecological Indicators

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“…The kinematic viscosity of water (m) is equal to 1.79 3 10 26 m 2 /s at 08C, as is likely for the authors' experimental conditions. From the data presented in Zare et al [2016b], a typical value for u *i is 0.02 m/s. Consequently, equation (9) would apply so long as k si > $70 3 1.79 3 10 26 /0.02 5 0.0063 m; it follows from equation (12) (which is obviously mistyped), that n i should exceed $0.047 3 0.0063 1/6 or 0.02.…”

Section: Possible Deficiencies Of Reported Resultsmentioning

confidence: 99%

“…A second source of potentially serious error is related to the fact that the upper flow layer often included a slowly moving and thick sublayer of frazil slush [Zare et al, 2016b]. The resulting velocity profiles were strikingly nonlogarithmic.…”

Section: Possible Deficiencies Of Reported Resultsmentioning

confidence: 99%

“…It can also be applied to individual verticals (with R i and R b representing distances from the respective boundaries to the point of maximum velocity, V max ), provided that lateral gradients of fluid shear are very small relative to vertical gradients. Judging by the bathymetry at the location of the instrument, as depicted in Zare et al [2016b], this condition was probably fulfilled; however, there is no certainty, because the lateral variations of flow and ice conditions are not known.…”

Section: Definition and Properties Of The Friction Slopementioning

confidence: 99%

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Comment on “Estimation of composite hydraulic resistance in ice‐covered alluvial streams” by Ghareh Aghaji Zare et al.

Beltaos

2016

Water Resources Research

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Estimation of composite hydraulic resistance in ice‐covered alluvial streams

Zare

Moore

Rennie

et al. 2016

Water Resources Research

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Formation, propagation, and recession of ice cover introduce a dynamic boundary layer to the top of rivers during northern winters. Ice cover affects water velocity magnitude and distribution, water level and consequently conveyance capacity of the river. In this research, total resistance, i.e., ''composite resistance,'' is studied for a 4 month period including stable ice cover, breakup, and open water stages in Lower Nelson River (LNR), northern Manitoba, Canada. Flow and ice characteristics such as water velocity and depth and ice thickness and condition were measured continuously using acoustic techniques. An Acoustic Doppler Current Profiler (ADCP) and Shallow Water Ice Profiling Sonar (SWIPS) were installed simultaneously on a bottom mount and deployed for this purpose. Total resistance to the flow and boundary roughness are estimated using measured bulk hydraulic parameters. A novel method is developed to calculate composite resistance directly from measured under ice velocity profiles. The results of this method are compared to the measured total resistance and to the calculated composite resistance using formulae available in literature. The new technique is demonstrated to compare favorably to measured total resistance and to outperform previously available methods.1. Appropriate water releases from upstream water reservoirs or dams according to the water demands for hydropower generation, and urban, industrial, and agricultural water consumption. 2. Hydraulic measurement issues due to disturbance of stage-discharge relations caused by complete or partial ice coverage of control reach, and 3. Early mechanical breakup due to rapid water staging in ice-covered channels, which can lead to ice jam formation and release which increases the chance of severe flooding. Key Points: Study of hydraulic resistance of river boundaries during ice cover period Evaluation of available methods for composite roughness calculation Introduction of a new approach for composite roughness estimation PUBLICATIONSAmong the important factors that determine a channel's conveyance capacity, hydraulic resistance of a covered reach is a factor that varies directly according to the condition of the ice cover.

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Boundary Shear Stress in an Ice-Covered River during Breakup

Cited by 16 publications

References 30 publications

Modeling streamwise velocity and boundary shear stress of vegetation-covered flow

Modeling streamwise velocity and boundary shear stress of vegetation-covered flow

Comment on “Estimation of composite hydraulic resistance in ice‐covered alluvial streams” by Ghareh Aghaji Zare et al.

Estimation of composite hydraulic resistance in ice‐covered alluvial streams

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