...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Quaternary Science Reviews: The International Multidisciplinary Review Journal >Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation
【24h】

Subglacial till behaviour derived from in situ wireless multi-sensor subglacial probes: Rheology, hydro-mechanical interactions and till formation

机译：从原位无线多传感器冰下探头获得的冰下耕层行为：流变，水力相互作用和耕层形成

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The rheology and hydro-mechanical interactions at the ice-bed interface form an important component of the glacier system, influencing glacier dynamics and the formation of till. We demonstrate that the sand-rich till at Briksdalsbreen in Norway, undergoes deformation throughout the year. On the bulk rheology scale, till deformation exhibits elastic behaviour during the winter, when water pressures are low; and linear viscous behaviour after a critical yield stress of 35 kPa, when water pressures are high during the spring and summer. On the clast and matrix scale, low water pressures, correspond with high case stress variability and till temperatures. Meltwater driven, stick-slip, glacier velocity increases were transmitted through a relatively strong till grain network, causing brittle deformation. Intermediate water pressures, during late summer were linked to intermediate case stress variability and high till temperatures associated with the heat generated from stick-slip motion. High water pressures in the till were associated with low case stress variability and low, meltwater controlled, till temperatures, and occurred in the spring and autumn. Once the till was saturated, the ductile till absorbed any stick-slip velocity increases. We discuss, with examples, the different till forming processes associated with these changing conditions, demonstrating that the resultant till will represent a complex amalgamation of all of these processes.
机译：冰床界面处的流变学和水力-机械相互作用形成了冰川系统的重要组成部分，影响了冰川的动力学和耕作的形成。我们证明，在挪威Briksdalsbreen的富含沙子的地块全年都会发生变形。在整体流变学规模上，直到冬季水压力低时，变形才会表现出弹性。春季和夏季水压高时，临界屈服应力为35 kPa后，其线性和粘滞行为。在垫层和基体尺度上，低水压对应于高应力变化和直到温度。融水驱动的，粘滑的，冰川速度的增加通过相对坚固的耕作网传播，导致脆性变形。夏末期间的中间水压与中间情况下的应力变化性以及与粘滑运动产生的热量相关的高至温度有关。耕till中的高水压与较低的应力变化和较低的，受融水控制的耕till温度有关，并发生在春季和秋季。一旦耕till饱和，延展性耕till吸收的任何粘滑速度都会增加。我们以示例的形式讨论了与这些变化的条件相关的不同的耕种形成过程，证明了最终的耕种将代表所有这些过程的复杂合并。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号