Distribution of Motion Beneath Soft-Bedded Glaciers: Laboratory Studies of Till Deformation and Non-Hydrostatic Pore Pressure

软层冰川下的运动分布：蒂尔变形和非静水孔隙压力的实验室研究

• 批准号: 9725360
• 负责人: Neal Iverson
• 金额: $ 18.68万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-15 至 2003-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725360&HistoricalAwards=false
• 关键词: Distribution; Motion; Beneath; Soft; Bedded

9725360 Iverson This award supports a program to conduct experiments with a ring-shear device that deforms a large water-saturated till specimen to high strains, for studies of till comminution, rheology, and fabric development. Despite the widespread realization that subglacial sediment affects the dynamics of ice sheets, the factors that control the sediment mass balance remain obscure. Direct measurements beneath a handful of glaciers seem to indicate a wide range of behavior, varying from pervasive deformation of the bed to motion that is focused at the glacier sole. The interpretation of these measurements and the accurate modeling of basal sediment transport requires laboratory studies aimed at revealing the fundamental factors that control the distribution of motion at the glacier bed.

9725360 Iverson该奖项支持一项计划，该计划使用环剪装置进行实验，使大型水饱和的冰碛样品变形至高应变，以研究冰碛粉碎，流变学和织物发展。 尽管人们普遍认识到冰下沉积物会影响冰盖的动态，但控制沉积物质量平衡的因素仍然不清楚。 在少数冰川下的直接测量似乎表明了广泛的行为，从河床的普遍变形到集中在冰川底部的运动。 对这些测量结果的解释和对基底沉积物输运的精确建模需要进行实验室研究，旨在揭示控制冰川床运动分布的基本因素。