Author(s): Tadros R. Ghobrial; Sean Boyd; Mark R. Loewen
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Abstract: Anchor ice can alter river hydraulics, affect fish habitat, reduce hydropower generation, and change the sediment budget of northern rivers. Although detailed laboratory experiments have been conducted to study anchor ice, much fewer field observations of anchor ice processes that have been reported. In this study, a field measurement program was undertaken to monitor anchor ice formation and release on the North Saskatchewan River in Edmonton, Alberta during freeze-up in 2019. The monitoring program included the deployment of a custom-built imaging system (camera and lighting), precision water temperature loggers, depth sensors, an upward looking sonar, Acoustic Doppler Velocimeter (ADV), and an acceleration and tilt sensor. Preliminary results showed that anchor ice formation and release can be reliably detected by the upward looking sonar, the ADV and the accelerometer. In addition to the formation and release of anchor ice, the underwater camera system was able to detect the growth rate of anchor ice.
Year: 2020