Ice Jam Formation and Release Dynamics - Hay River, NWT

冰塞的形成和释放动力学 - 海伊河，西北地区

• 批准号: 305416-2013
• 负责人: Hicks, Faye
• 金额: $ 1.09万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Northern Research Supplement
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=594954
• 关键词: Ice; Jam; Formation; Release; Dynamics

Each year during the spring, river breakup brings the threat of ice jam floods to many of the communities across Canada that are situated around rivers. Breakup ice jams occur when snowmelt swells the stream, and lifts and breaks the ice cover suddenly. The ice pieces may initially be carried along with the snowmelt flow, but often become congested - perhaps at a bridge, at a tight bend in the river, or in amongst islands - and when this happens an ice jam is formed. The streamflow is blocked by this dam of ice, and water levels can rise at rates approaching 60 to 90 centimeters (2 to 3 feet) per minute, with virtually no advance warning.

每年春季，河流溃决都会给加拿大各地河流周围的许多社区带来冰塞洪水的威胁。当融雪使溪流膨胀，突然抬起并打破冰盖时，就会发生破裂冰塞。冰块最初可能会随着融雪流一起携带，但通常会变得拥挤——可能在桥梁、河流的急转弯处或岛屿之间——当这种情况发生时，就会形成冰塞。水流被冰坝阻挡，水位会以每分钟接近 60 至 90 厘米（2 至 3 英尺）的速度上升，几乎没有任何预警。