Geophysical Discussion

Effects of moving ice on banks, river bars and rock outcrops have been described by Wentworth.9Eardley 10 and Williams 11 have noted that erosion of banks during the short break-up period is minor compared to the work of current and wind waves, although ice lifted over the banks by high water can sweep through forests or river settlements.Since present observations were limited to a single locality, they must be considered valid only for the village of Beaver, though general sequences of events are probably duplicated elsewhere along the river.Future studies of break-up and freeze-up should gather many quantitative data on hydrology and meteorology of the entire river system, together with systematic observations at many points over a period of several years. MS.