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Laboratory study showed that oil spilled under river ice cover could be recovered from a slot cut on the ice cover if the slot was properly dimensioned and the river flow and oil properties met certain criteria. The parameters affecting the containment and recovery capability of a slot were identified and their quantitative effects were studied through systematic experiments. Design curves were derived for proper design of slots normal to the flow. The study revealed that slots at an angle to the flow were more effective in trapping the spilled oil. In addition, they guided the oil to the more desirable points for recovery. Design curves for angled slot diverters were also obtained. In addition to slots, imbedded barriers and slot-barrier combinations were also studied for their effectiveness in containing and diverting spilled oil. The quantitative effects of the affecting parameters were studied through experiments and design curves were obtained for proper design of barriers and slot-barrier combinations. The laboratory study was used to guide a successful field exercise in March 1978 on the North Saskatchewan River in Alberta. In the field exercise, more than 99 percent of the oil spilled upstream was recovered by the slot. The field results and the laboratory predictions are compared.

RECOVERY OF OIL SPILLED UNDER RIVER ICE COVER