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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Ice flow-unit influence on glacier structure, debris entrainment and transport
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Ice flow-unit influence on glacier structure, debris entrainment and transport

机译：冰流单位对冰川结构，碎屑夹带和运输的影响

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摘要

The links between structural glaciology, glacial debris entrainment and transport have been established in a number of different glacier settings. Here we document the structural evolution of a temperate Alpine valley glacier (Vadrec del Forno, Switzerland) and demonstrate that individual flow units within the glacier have very different structural and debris characteristics. The glacier consists of a broad accumulation area with multiple basins feeding a relatively narrowtongue and is formed from six distinct flowunits. Each flow unit has its own characteristic structural assemblage. Flow units that narrow rapidly down-glacier are dominated by primary stratification that has evolved into longitudinal foliation. In contrast, wider flow units preferentially develop an axial planar foliation. Glacier structure plays a limited role in the entrainment of debris,which ismore strongly influenced by ice-marginal rockfall and avalanche inputs onto the glacier surface. However, once entrained, glacier structure controls the reorientation and redistribution of debris within the ice mass. By taking a whole-glacier approach to describing glacier structure and debris transport, we conclude that individual flow units are unique with regard to structure and debris transfer.
机译：在许多不同的冰川环境中已经建立了结构冰川学，冰川碎屑夹带和运输之间的联系。在这里，我们记录了温带高山山谷冰川（瑞士瓦德雷克德尔福尔诺）的结构演化，并证明了冰川内的各个流动单元具有非常不同的结构和碎片特征。冰川由一个宽广的堆积区组成，有多个盆地供以相对狭窄的舌头，由六个不同的流动单元组成。每个流量单元都有自己独特的结构组合。迅速下冰川变窄的流动单元主要由已形成纵向页岩的主要分层构成。相反，较宽的流动单元优先形成轴向平面叶状结构。冰川结构在夹带碎屑中起着有限的作用，而碎屑的夹带更受冰边缘岩屑和雪崩输入到冰川表面的强烈影响。但是，一旦被夹带，冰川结构将控制碎屑在冰块中的重新定向和重新分布。通过采用全冰川的方法来描述冰川的结构和碎屑的运输，我们得出结论，各个流动单元在结构和碎屑的转移方面是独特的。

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