Abstract
An indirect method of using tree scars to determine stage and frequency of ice drives and jams was tested on the Red Deer River at Red Deer, Alberta. The method involves determining the ages and heights of ice scars on river bank tree trunks. Cores, wedges, and slice cross-sections of scarred trunks were sampled to determine scar ages. Heights of the scars above the river surface were also measured. Often scars on a single tree were overlapped and/or located at different heights on the trunk, thus recording multiple ice drive events. The height and age record of ice scarred trees were then compared against the hydrometric and historical record of ice drives and jams.The comparison suggests that by applying a correction factor the indirect method of using tree scars to assess frequency and stage of ice drives and jams is reliable, and shows considerable promise. The method is particularly applicable to rivers which are ungauged or are without a long term hydrometric record.
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