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river icebreaker
A river icebreaker is an icebreaker specially designed to operate in shallow waters such as rivers and estuaries, and often able to pass through canals and under bridges.〔 As published by the American Society of Civil Engineers almost a century ago, "On some rivers, particularly where melting first takes place on the upper river, as on the Oder and Weichsel in Germany, the formation of ice jams is a frequent cause of floods."〔 River icebreakers can operate in any navigable waterway to prevent such ice jams.〔
Various river icebreakers, from smaller vessels to nuclear-powered shallow draft icebreakers ''Vaygach'' and ''Taymyr'',〔(Russian nuclear icebreaker is working around the clock to clear vessel jam in Gulf of Finland ). Helsingin Sanomat. 〕 are also in service in the large rivers of the Russian arctic.
== See also ==
*Frankfurt (icebreaker)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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