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

研究了冰川侵蚀与冰川动力学之间的反馈关系。它通过测量沉积物侵蚀的时空格局、基底土的性质、基底水压、基底运动、冰变形、地表速度、地表质量平衡以及地表高程和终点位置的变化来实现这一目标。这将通过一项综合观测计划来完成，该计划使用无线电回波探测、反射地震、钻孔观测、GPS、卫星遥感、机载激光雷达和数字摄影测量。所有观测结果都将在数值模型的帮助下进行解释，这些模型将探索边界条件变化和长期演变的影响，并考虑到泥沙开挖的影响。这项工作将在阿拉斯加东南部的Taku冰川进行，目前所有相关过程都在活跃。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，该计划是为朱诺冰原的高中生和大学生提供的年度教育计划。

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.