| DOI: | 10.5194/hess-24-2655-2020
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| 论文题名: | A history of the concept of time of concentration |
| 作者: | Beven K.J.
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| 刊名: | Hydrology and Earth System Sciences
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| ISSN: | 1027-5606
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| 出版年: | 2020
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| 卷: | 24, 期:5 | | 起始页码: | 2655
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| 结束页码: | 2670
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| 语种: | 英语
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| Scopus关键词: | Runoff
; Catchment models
; Catchment response
; Hydrological response
; Rational methods
; Surface and subsurface flow
; Time of concentrations
; Unit hydrograph
; Water particles
; Catchments
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| 英文摘要: | The concept of time of concentration in the analysis of catchment responses dates back over 150 years to the introduction of the rational method. Since then it has been used in a variety of ways in the formulation of both unit hydrograph and distributed catchment models. It is normally discussed in terms of the velocity of flow of a water particle from the furthest part of a catchment to the outlet. This is also the basis for the definition in the International Glossary of Hydrology. While conceptually simple, this definition is, however, wrong when applied to catchment responses where, in terms of how surface and subsurface flows produce hydrographs, it is more correct to discuss and teach the concept based on celerities and time to equilibrium. While this has been recognized since the 1960s, some recent papers and texts remain confused over the definition and use of the time of concentration concept. The paper sets out the history of its use and clarifies its relationship with time to equilibrium but suggests that both terms are not really useful in explaining hydrological responses. An Appendix is included that quantifies the differences between the definitions of response times for subsurface and surface flows under simple assumptions that might be useful in teaching. © Author(s) 2020. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/162687
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| Appears in Collections: | 气候变化与战略
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作者单位: | Beven, K.J., Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom
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| Recommended Citation: | |
Beven K.J.. A history of the concept of time of concentration[J]. Hydrology and Earth System Sciences,2020-01-01,24(5)
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