Abstract
Abstract It is highly important to have a better knowledge of river systems during the seasons when air temperature drops below freezing point if we consider the difficulties posed to hydrotechnical exploitations and the destruction caused by floods (as a result of ice jam development). The article presents briefly some opinions and hypotheses various researchers have formulated over time on the genesis of ice formations on rivers. Moreover, the article includes several analyses of ice formations developed on the Bistriţa and Bistricioara rivers as wells as hazardous winter phenomena that may cause such ice formations, e.g., ice jams (ice dams). The development of winter-specific phenomena on the two rivers during the winter of 2011 - 2012 is illustrated in pictures, graphs, and maps taken or developed on the basis on data collected in situ during research.
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