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

这项建议涉及冰川侵蚀和冰川动力学之间的反馈问题。它通过测量沉积物侵蚀的时空模式、基础耕作的特性、基础水压力、基础运动、冰变形、表面速度、表面质量平衡以及表面高程和末端位置的变化来实现这一点。这将通过使用无线电回波探测、反射地震、钻孔观测、全球定位系统、卫星遥感以及机载激光雷达和数字摄影测量的综合观测方案来实现。所有观测结果都将借助数值模型进行解释，这些模型将考虑到泥沙开采的影响，探索边界条件变化的影响和较长期的演变。这项工作将在阿拉斯加东南部的塔库冰川进行，目前所有相关进程都在那里进行。该项目将影响冰川和冰盖演化的模型研究，以及对过去冰川沉积记录的解释。该建议将与朱诺冰场研究计划的活动密切协调，朱诺冰场研究计划是针对朱诺冰场的高中生和大学生的年度教育计划。

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.