River ice breakup flood forecasting

河流破冰洪水预报

• 批准号: RGPIN-2015-04769
• 负责人: She, Yuntong
• 金额: $ 1.68万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636340
• 关键词: River; ice; breakup; flood; forecasting

River ice breakup can be instigated by spring runoff, mid-winter thaws, and hydro-peaking operations, and is a crucial event on Canadian rivers because of its economic and ecological impacts. The breakup period features frequent ice jam events which can result in severe and hard-to-predict flooding; further, when formed in place, ice jams can create physical barriers that impede navigation. When ice jams release, they can produce destructive high-speed water waves and ice runs that can damage infrastructure, cause bank and bed erosion, and endanger or even sink shipping. Because of the risks posed by ice jams, hydro-peaking operations often need to be modified to avoid triggering their formation and release, thus limiting hydro-power production. Ice jam events may adversely impact river ecosystems but in some cases can also provide essential replenishment to the river systems (e.g. Mackenzie River Delta). For all these reasons, it is therefore desirable to understand river breakup and ice jam phenomena and to be able to predict their occurrence with greater accuracy. The challenge is that the presence of ice, interacting with the dynamic flow in various ways, makes forecasting these events very difficult.

河冰破裂可以由春季径流、冬季中期解冻和水力调峰作业引起，由于其经济和生态影响，它是加拿大河流上的一个关键事件。在冰塞破裂期间，经常发生冰塞事件，这可能导致严重和难以预测的洪水;此外，当冰塞形成时，冰塞可能会形成阻碍航行的物理障碍。当冰塞释放时，它们会产生破坏性的高速水波和冰流，这可能会破坏基础设施，导致银行和河床侵蚀，并危及甚至沉没航运。由于冰塞带来的风险，水力调峰作业往往需要修改，以避免触发冰塞的形成和释放，从而限制水力发电。冰塞事件可能会对河流生态系统产生不利影响，但在某些情况下，也可以为河流系统提供必要的补给（例如麦肯齐河三角洲）。由于所有这些原因，因此需要了解河流断裂和冰塞现象，并能够更准确地预测其发生。面临的挑战是，冰的存在，以各种方式与动态流相互作用，使得预测这些事件非常困难。