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Preprints
https://doi.org/10.2139/ssrn.4737919
https://doi.org/10.2139/ssrn.4737919
25 Mar 2024
 | 25 Mar 2024

Measurements of Frazil Ice Flocs in Rivers

Chuankang Pei, Jiaqi Yang, Yuntong She, and Mark Loewen

Abstract. Frazil floc sizes and concentrations have been investigated in a small number of laboratory studies but no detailed field measurements have been reported previously. In this study, a submersible camera system was deployed a total of eleven times during the principal and residual supercooling phases in the North Saskatchewan, Peace, and Kananaskis Rivers to capture time-series images of frazil ice particles and flocs. Images were processed to accurately identify flocs and to calculate their sizes and concentrations. Key hydraulic and meteorological measurements were collected and air-water heat fluxes were estimated to investigate their influence on floc properties. A lognormal distribution was found to be a good fit for the floc size distribution. The mean floc size ranged from 1.19 to 5.64 mm and the overall mean floc size was 3.80 mm. The mean floc size decreased linearly as the local Reynolds number increased. The average floc number concentration ranged from 1.80 × 10−4 to 1.15 × 10−1 cm−3. The average floc volumetric concentration ranged from 2.05 × 10−7 to 4.56 × 10−3 and was found to correlate strongly with the relative depth of the measurements. No significant correlations were found between the air-water heat flux and floc properties. Time series analysis showed that during the principal supercooling phase, floc number concentration and mean size increased significantly just prior to peak supercooling and reached a maximum near the end of principal supercooling. During the residual supercooling phase, the mean floc size did not typically vary significantly even 2.5 hours after the residual phase ended and the water temperature increased above zero degrees.

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Journal article(s) based on this preprint

18 Sep 2024
Measurements of frazil ice flocs in rivers
Chuankang Pei, Jiaqi Yang, Yuntong She, and Mark Loewen
The Cryosphere, 18, 4177–4196, https://doi.org/10.5194/tc-18-4177-2024,https://doi.org/10.5194/tc-18-4177-2024, 2024
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Frazil flocs are aggregates of frazil ice particles formed in supercooled water, as they grow...
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