...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Hillslopes, rivers, plows, and trucks: Mass transport on earth's surface by natural and technological processes
【24h】

Hillslopes, rivers, plows, and trucks: Mass transport on earth's surface by natural and technological processes

机译：山坡，河流，耕犁和卡车：通过自然和技术过程在地球表面进行大规模运输

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 surface of the earth is being transformed by a new force in the form of technological systems and processes that move significant quantities of mass large distances. Because movement of mass is perhaps the most basic geomorphic process, and because the continuing rise of technology appears to characterize a new epoch in earth evolution (the Anthropocene), it is of interest to compare technological and natural mass transport mechanisms. A purely dynamical 'mass-action' metric, representing the product of mass displaced, distance moved, and mean speed of displacement, is used to compare the transport effectiveness of selected systems. Systems with large mass-action tend to be advective, and systems with small mass-action diffusive. Local environments are conditioned by mass-action through the introduction of transport corridors, such as roads and rivers, which put constraints on mass transport by embedded diffusive systems. Advection also subjects local environments to externally determined time scales, such as the times for delivery of unit mass of water or sediment to a river mouth, and supports the emergence of associated dynamical processes there, for example those of human activity or delta construction, that are too rapid to be sustained by diffusion. Most of the world's mass-action is generated by the motion of fluids of global or continental extent, as in atmospheric circulation or river flow. Technological mass-action exceeds that of all land-based geomorphic systems except rivers. Technological systems with large mass-action tend to be comprised of discrete, self-powered units (e.g. trucks). Discretization of transported mass reflects the different locomotion strategy required for transport of solids on land, compared with the transport requirements of spatially extensive fluids in nature. The principle of maximum entropy production may provide a framework for understanding the emergence of advective, technological mass-transport systems.
机译：地球表面正在以一种新的力量发生变化，这种力量以技术系统和过程的形式出现，这些系统和过程可以移动大量的大量远距离。由于质量运动可能是最基本的地貌过程，并且由于技术的不断发展似乎代表了地球演化的新纪元（人类世），因此比较技术和自然质量的运输机制是很有意义的。代表质量位移，移动距离和平均位移速度的乘积的纯动态“质量作用”度量标准用于比较所选系统的运输效率。具有大质量作用的系统倾向于对流，具有小质量作用的系统具有扩散性。通过引入运输走廊（例如道路和河流），通过群众行动来限制当地环境，这限制了嵌入式扩散系统的大规模运输。对流还使本地环境受到外部确定的时间尺度的影响，例如将单位质量的水或沉积物输送到河口的时间，并支持那里相关的动力学过程的出现，例如人类活动或三角洲建设的过程。太快了，无法通过扩散来维持。世界上大部分的质量作用是由全球或大陆范围的流体运动产生的，例如大气环流或河流中的运动。技术质量作用超过了除河流以外的所有陆基地貌系统。具有大质量作用的技术系统往往由离散的自供电单元（例如卡车）组成。与自然界中空间广泛的流体的运输要求相比，运输质量的离散化反映了固体在陆地上运输所需的不同运动策略。最大熵产生原理可以为理解对流，技术性大规模运输系统的出现提供一个框架。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 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