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Non-capacity or capacity model for fluvial sediment transport.
- Source :
-
Proceedings of ICE: Water Management . Apr2012, Vol. 165 Issue 4, p193-211. 19p. - Publication Year :
- 2012
-
Abstract
- 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 is critical for suspended sediment transport, whereas a capacity model may result in considerable errors at best and become ill-posed at worst because of the requirement for extra boundary conditions. The findings of this work should facilitate the physically enhanced development and applications of mathematical river models. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SEDIMENT transport
*MATHEMATICAL models
*ALLUVIUM
*HYDRAULICS
*CIVIL engineering
Subjects
Details
- Language :
- English
- ISSN :
- 17417589
- Volume :
- 165
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Proceedings of ICE: Water Management
- Publication Type :
- Academic Journal
- Accession number :
- 73649551
- Full Text :
- https://doi.org/10.1680/wama.10.00035