Rheology of Basal Ice

基础冰的流变学

• 批准号: 9423422
• 负责人: Roger Hooke
• 金额: $ 15.43万
• 依托单位: University of Minnesota-Twin Cities
• 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: 1995-04-01 至 1999-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9423422&HistoricalAwards=false
• 关键词: Rheology; Basal; Ice

This award supports a two year study of the rheology of basal ice. The study has two principal parts: 1) measurements of the ice flow field around an artificial irregularity at the base of the glacier Engabreen in northern Norwway; and 2) development of a theoretical (numerical) model, that describes the threedimensional flow field in basal ice. Tunnels through the bedrock beneath Engabreen, will provide the unique setting and opportunity to directly measure the flow field in basal ice. The velocity field will be determined by using a video camera to monitor the position of markers in the ice. The numerical model will be based on an existing finite element code at the University of Minnesota, taking advantage of the facilities at the Minnesota Supercomputer Institute. Comparison between the model and the experimentally observed flow fields will permit an evaluation of various constitutive laws. Numerical values will be determined for the material constants in the models that give the best fit to the observed flow field.

该奖项支持对基础冰流变学进行为期两年的研究。 这项研究有两个主要部分：1）在挪威北方的冰川Engellen的基础上，人工不规则周围的冰流场的测量;和2）理论（数值）模型的发展，描述了三维流场在基础冰。 穿过Engellen下方基岩的隧道将提供独特的环境和机会，直接测量基底冰中的流场。 速度场将通过使用摄像机来监测冰中标记的位置来确定。 数值模型将基于明尼苏达大学现有的有限元代码，利用明尼苏达超级计算机研究所的设施。 模型和实验观察到的流场之间的比较将允许各种本构关系的评价。 将确定模型中材料常数的数值，这些数值最适合观察到的流场。