Glacial Erosion and the Budget of Basal Rock Debris

存在相当大的动机去研究 冰底岩屑的丰度和分布 因为它们在动力学中很重要， 冰川和冰盖的地貌表现。 拟议 这项工作旨在更好地了解侵蚀过程是如何 在冰川床上产生和改变碎片，以及如何 运输过程混合、分散并最终消除了这一点 碎片 研究人员将完成冰川的理论模型 开采和提炼一种新的磨损模式， 第一次将所有主要过程之间的定量联系 控制着基岩的侵蚀和基底的丰富程度 碎片 然后，用新的模型结果武装采石场的 从床的碎片和颗粒/床的相互作用，这是可能的 重新分析大量已发表的冰川漂移数据， 包括散布模式、粒度的空间变化，以及 反映磨损和断裂的颗粒纹理。 物理 从模型中获得的洞察力和量化将 冰川碎片和铅的起源的重要新光， 更精确地推断未石化的 冰盖和冰川底部的物质比过去 以前可能的。 拟议的研究是这项工作的自然延伸 几乎完成了大规模的冰川侵蚀，资金来自 ERA87-08400。 这项研究为今后的研究提供了坚实的基础。 提出了改进我们的侵蚀分析，及其应用 冰川学解释的关键特征， 冰川沉积物

Considerable motivation exists to study processes that govern the abundance and distribution of rock debris at the base of ice masses because they figure importantly in the dynamics and geomorphic manifestations of glaciers and ice sheets. The proposed work is aimed at better understanding how erosional processes operate to generate and modify debris at the glacier bed, and how transport processes mix, disperse and eventually eliminate this debris. Researchers will complete a theoretical model of glacial quarrying and refine a new model of abrasion, which provides for the first time a quantitative link between all major processes governing both the erosion of bedrock and the abundance of basal debris. Then, armed with new model results about quarrying of debris from the bed and particle/bed interactions, it is possible to re-analyse considerable published data on glacial drift, including dispersal patterns, spatial variations in grain size, and particle textures reflecting wear and fracture. The physical insight and quantification gained from the models will shed significant new light on the genesis of glacial debris, and lead to more precise inferences about the behavior of unlithified material at the base of ice sheets and glaciers than has been previously possible. The proposed research is a natural extension of the work nearly completed on large-scale glacial erosion, with funds from ERA87-08400. This study provides a firm foundation for the proposed refinement of our erosion analysis, and its application to the glaciological interpretation of key characteristics of glacial sediments.