A Primer on Bedrock Channels
A Primer on Bedrock Channels
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基岩通道入门
DOI：
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发表时间：
2013
期刊：
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通讯作者：
E. Wohl
中科院分区：
文献类型：
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作者：
K. Tinkler;E. Wohl
在这篇关于基岩通道的介绍性论文中，我们试图总结知识状况并为未来的工作指出方向。针对冲积和砾石河道开发的河流地貌学并不容易将其结果转移到基岩河道，例如传统的水力几何学似乎不适用于这些高度变化的河道。由于基岩河道涉及阻力边界（通常是流域基岩边界）的变化，河道侵蚀影响的基准面变化随后传递到盆地的其他部分，因此从地质时间尺度来看，对流域地貌的各个方面都有影响。我们回顾了短期和长期尺度、从河段到盆地尺度的形态和过程的现有知识。我们指出，了解基岩河道的基础是需要了解河道中的跨临界流动条件，以及这可能对河道侵蚀和沉积物运输产生的后果。有机会从事该学科各个方面的基础工作——从形态描述和监测，到河床侵蚀和泥沙输送的力学，再到与环境控制相关的洪水排放年表的构建，以及现场、水槽和计算机中的高梯度洪水水力学。
In this introductory paper on bedrock channels we try to summarize the state of knowledge and point out directions for future work. Fluvial geomorphology as developed for alluvial and gravel channels does not readily transfer its results to bedrock channels, for example conventional hydraulic geometry does not seem to apply to these highly variable channels. Because bedrock channels involve changes on a resistant boundary that is usually that of the drainage basin bedrock, baselevel changes effected by channel erosion are subsequently transmitted to the rest of the basin, and therefore have an impact on all aspects of drainage basin geomorphology when viewed over geological timescales. We review existing knowledge of both morphology and process over short and long times scales, and from reach to basin scales. We point out that fundamental to an understanding of bedrock channels is the need to appreciate transcritical flow conditions in the channels, and the consequences that this may have for channel erosion and sediment transport. There are opportunities to undertake fundamental work in all aspects of the subject - from morphological description and monitoring, through the mechanics of channel bed erosion and sediment transport, to the construction of flood discharges chronologies in relation to environmental controls, and high-gradient flood hydraulics in the field, the flume and the computer.