Damming and Flooding of Russell Fiord by Rapidly Advancing Hubbard Glacier, Yakutat, Alaska

阿拉斯加州雅库塔特哈伯德冰川快速推进导致拉塞尔峡湾筑坝和洪水泛滥

• 批准号: 0949775
• 负责人: Daniel Lawson
• 金额: $ 17.87万
• 依托单位: Department of Army Cold Regions Research & Engineering Lab
• 依托单位国家: 美国
• 项目类别: Interagency Agreement
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2012-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0949775&HistoricalAwards=false
• 关键词: Damming; Flooding; Russell; Fiord; Rapidly

Funds are provided in support of a RAPID award to study the dynamics of the tongue of Hubbard Glacier, Yakutat, Alaska. It is anticipated that the sustained advance of Hubbard Glacier?s tidewater terminus will soon create an ice dam at Gilbert Point, closing the tidal channel linking Disenchantment Bay with Russell Fiord and forming a 64 km long lake. The natural event has only rarely been observed and the creation of an ice dam by an advancing tidewater glacier represents an unparalleled opportunity to monitor the process. This study will document the anticipated formation of the ice dam and analyze the processes, mechanics and factors determining method and style of closure, dam stability and or failure. Understanding the dynamics of the ice margin is crucial to understanding how ice dams are created and their performance as a permanent closure to Russell Fiord. During the advance and closure, instrumental measurements coupled to sequential image analysis will examine the ice marginal marine environment in relation to monitored ice flow and ice structure at the dam site. Additionally, if a lake is formed behind the ice dam, the freshening evolution of the lake will be monitored.

提供资金以支持RAPID奖，用于研究阿拉斯加州雅库特哈伯德冰川舌部的动态。预计哈伯德冰川的持续推进？美国的潮汐终点站不久将在吉尔伯特角形成一个冰坝，关闭连接幻灭湾和罗素峡湾的潮汐通道，形成一个64公里长的湖泊。这一自然事件很少被观察到，而由前进的潮汐冰川形成的冰坝为监测这一过程提供了无与伦比的机会。本研究将记录冰坝的预期形成，并分析决定关闭方法和风格、大坝稳定性和/或失败的过程、力学和因素。了解冰缘的动态对于理解冰坝是如何形成的以及它们作为罗素峡湾永久关闭的作用至关重要。在推进和关闭期间，仪器测量与连续图像分析相结合，将检查与监测的冰流和坝址冰结构有关的冰边缘海洋环境。此外，如果在冰坝后面形成湖泊，将监测湖泊的更新演变。