Collaborative Research: Dynamics of subglacial erosion of soft sediments and its consequences for glacier evolution

合作研究：软沉积物冰下侵蚀动力学及其对冰川演化的影响

• 批准号: 1303895
• 负责人: Jason Amundson
• 金额: $ 11.17万
• 依托单位: University of Alaska Southeast Juneau Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-12-01 至 2017-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1303895&HistoricalAwards=false
• 关键词: Collaborative; Research; Dynamics; subglacial; erosion

This proposal addresses the feedbacks between glacier erosion and glacier dynamics. It does so by measuring the spatial and temporal patterns of sediment erosion, properties of basal till, basal water pressure, basal motion, ice deformation, surface velocities, surface mass balance, and changes in surface elevation and terminus position. This will be accomplished through a comprehensive observational program using radio echo sounding, reflection seismics, borehole observations, GPS, satellite remote sensing, and airborne LiDAR and digital photogrammetry. All observations will be interpreted with the help of numerical models that explore the effects of changing boundary conditions and the longer term evolution, taking into account the effects of sediment excavation. The work will be carried out at Taku Glacier, Southeast Alaska where all relevant processes are currently active. This project will impact model studies on glacier and ice sheet evolution, as well as interpretations of sedimentary records from past glaciations.This proposal will be closely coordinated with activities of the Juneau Icefield Research Program, an annual educational program for high school and college students on the Juneau Ice field.

这项建议涉及冰川侵蚀和冰川动态之间的反馈。它通过测量沉积物侵蚀的空间和时间模式、基底冰碛物的性质、基底水压、基底运动、冰变形、表面速度、表面质量平衡以及表面高程和终点位置的变化来进行测量。这将通过一个综合观测方案来实现，该方案使用无线电回波探测、反射地震、钻孔观测、全球定位系统、卫星遥感、机载激光雷达和数字摄影测量。所有观测结果都将借助数值模型进行解释，这些模型将探讨边界条件变化的影响和长期演变，同时考虑到沉积物挖掘的影响。这项工作将在阿拉斯加东南部的塔库冰川进行，目前所有相关过程都在进行中。该项目将影响冰川和冰盖演变的模型研究，以及对过去冰川沉积记录的解释。该提案将与朱诺冰原研究计划的活动密切协调，该计划是针对朱诺冰原的高中和大学生的年度教育计划。