Non-capacity or capacity model for fluvial sediment transport

Non-capacity or capacity model for fluvial sediment transport
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河流泥沙输运的非容量或容量模型

DOI:
10.1680/wama.10.00035
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发表时间:
2012-04
影响因子:
1.1
通讯作者:
曹志先, Li Z., Pender G, Hu P.
曹志先, Li Z., Pender G, Hu P.
中科院分区:
工程技术4区
文献类型:
--
作者:
曹志先, Li Z., Pender G, Hu P.

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近几十年来,河流输沙的容量模型和非容量模型都得到了发展。虽然最近对河流过程的多个时间尺度的调查已经证实了对容量模型条件适用性的理解,但容量模型与非容量模型的差异程度仍有待阐明。本文对一维容量模型和非一维容量模型进行了比较研究。通过对河流过程多时间尺度的理论分析,证明了河床输运对局部水流的适应速度足够快,相应的能力模型是适用的。然而,由于床层演化极大地改变了流动,如果要正确地解决流动问题,除了床质输运之外,还需要一个非容量模型。此外,悬沙输运需要较长的时间和空间来适应能力。因此,非容量建模…
The last several decades have witnessed the development of both capacity and non-capacity models for fluvial sediment transport. While recent investigations of the multiple timescales of fluvial processes have substantiated the understanding of conditional applicability of capacity models, the extent to which a capacity model differs from a non-capacity model remains to be unravelled. This paper presents a comparative investigation of one-dimensional capacity and non-capacity models. As a corollary to the theoretical analyses of the multiple timescales of fluvial processes, this study demonstrates that bed load transport can adapt to local flow sufficiently rapidly and, accordingly, a capacity model is applicable. However, as bed evolution modifies the flow considerably, a non-capacity model is needed if the flow is to be properly resolved in addition to bed load transport. Furthermore, it takes a long time and space for suspended sediment transport to adapt to capacity. Therefore non-capacity modelling i...
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发表时间: 1984-03
影响因子: 3.7
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