Basal Morphology and Dynamics of a Temperate Surge-Type Glacier

温带涌动型冰川的基础形态和动力学

• 批准号: 9423477
• 负责人: William Harrison
• 金额: $ 62.99万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-01 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9423477&HistoricalAwards=false
• 关键词: Basal; Morphology; Dynamics; Temperate; Surge

This award supports a three year project to determine the morphology of the base of a surge-type glacier (Black Rapids Glacier, Alaska) using modern wireline drilling and sampling techniques, along with related measurements of basal water pressure, surface speed and other parameters. The project is an attempt to shed light, by direct observation, on the most important unsolved problem in glacier and ice sheet dynamics: the role of basal motion and how it is affected by the basal morphology. The role of bed morphology in glacier surging is of particular interest, because the restricted geographic occurrence of these glaciers may reflect necessary basal conditions. The drilling and sampling program proposed here should be able to recover continuous core of virtually any length, from the base of the clean ice, through any basal ice, sediments or combination of sediments and ice, and into the underlying bedrock. Although such sampling has been accomplished before in connection with mineral exploration, it would be the first scientific effort of its kind in a temperate glacier.

该奖项支持一个为期三年的项目，该项目使用现代电缆钻井和采样技术，以及相关的基础水压、表面速度和其他参数测量，确定激流型冰川（阿拉斯加黑急流冰川）底部的形态。该项目试图通过直接观察来阐明冰川和冰盖动力学中最重要的未解决问题：基底运动的作用及其如何受到基底形态的影响。河床形态在冰川涌动中的作用特别令人感兴趣，因为这些冰川的有限地理分布可能反映了必要的基础条件。这里提出的钻探和采样计划应该能够恢复几乎任何长度的连续岩心，从干净的冰的底部，穿过任何基冰、沉积物或沉积物和冰的组合，直到下面的基岩。虽然以前在矿物勘探方面已经完成了这种取样，但这将是在温带冰川中进行的第一次此类科学努力。