Large Scale Glacial Erosion and Debris Production

虽然孤立的冰川侵蚀模型已经被 虽然已经开发，但还没有认真尝试将这种联合收割机 研究冰川流动的模型， 深入了解冰川地貌的更大规模问题 进化 此外，这些分析几乎没有提供指导， 精确处理冰川侵蚀产生的碎片， 然而最近冰川底部的碎片 这是现代冰川动力学研究中的一个核心未知数。 冰川侵蚀的定量模型将根据 对冰川磨损的物理学进行了基本分析 和采摘（采石），并在基地实地观察， 格林内尔冰川蒙大拿州 初步的理论工作表明， 基于物理的滑动速度、基底 有效压力和开采速率。 进一步的理论 采石工作，结合Hallet的改进， （1981）磨损模型将提供一个整体的冰川侵蚀 建模 这种侵蚀模型将与有限的 冰川流动的元素程序，并用于模拟 冰川地貌的发展，如U形山谷， 建立碎片产生的空间模式，并跟踪碎片 冰川和冰盖中的运输。

Although isolated glacial erosion models have been developed, there has been no serious attempt to combine such work with models of glacier flow to provide quantitative insight into larger scale problems of glacial land-form evolution. Moreover, these analyses offer little guidance for a precise treatment of debris production by glacial erosion, and yet debris at the base of glaciers has recently emerged as a central unknown in modern considerations of glacier dynamics. A quantitative model of glacial erosion will be developed based on a fundamental analysis of the physics of glacial abrasion and plucking (quarrying), and field observations at the base of Grinnell Glacier, Montana. Initial theoretical work suggests a physically based relationship between sliding velocity, basal effective pressure and rate of quarrying. Further theoretical work on quarrying, in combination with improvements on Hallet's (1981) abrasion model will provide an overall glacial erosion modelling. This erosion model will be coupled with finite element programs for glacier flow, and used to simulate the development of glacial land-forms such as U-shaped valleys, model spatial patterns of debris production, and tracking debris transport in glaciers and ice sheets.