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A numerical modelling of flows in an open channel with emergent vegetation
Simulations of shallow-water flows in an open channel with vegetation are considered. The simple formulation of bulk resistance makes numerical realization of vegetation straightforward. Stem-scale eddies due to individual plants are not modelled. While the vegetation resistance parameterization has been frequently used, few studies exist that comprehensively evaluate the modelling skills of such a highly simplified approach in capturing the large-scale dynamics which are often of practical interest. This study provides such an assessment by conducting a range of comparisons between the simulations and data. While the simple model is remarkably effective, capturing the large-scale features that are comparable with the data (e.g. the two-layer structure of the shear layer resulting from the Kelvin–Helmholtz instability at the canopy–water interface, the steady wake behind a vegetation patch and formation of patch-scale von Kármán vortices), we emphasize the discrepancies in some aspects. These findings inform large-scale modelling and the needs for improvement.
A numerical modelling of flows in an open channel with emergent vegetation
Simulations of shallow-water flows in an open channel with vegetation are considered. The simple formulation of bulk resistance makes numerical realization of vegetation straightforward. Stem-scale eddies due to individual plants are not modelled. While the vegetation resistance parameterization has been frequently used, few studies exist that comprehensively evaluate the modelling skills of such a highly simplified approach in capturing the large-scale dynamics which are often of practical interest. This study provides such an assessment by conducting a range of comparisons between the simulations and data. While the simple model is remarkably effective, capturing the large-scale features that are comparable with the data (e.g. the two-layer structure of the shear layer resulting from the Kelvin–Helmholtz instability at the canopy–water interface, the steady wake behind a vegetation patch and formation of patch-scale von Kármán vortices), we emphasize the discrepancies in some aspects. These findings inform large-scale modelling and the needs for improvement.
A numerical modelling of flows in an open channel with emergent vegetation
Qu, Jingfang (author) / Yu, Jie (author)
Journal of Hydraulic Research ; 59 ; 250-262
2021-03-04
13 pages
Article (Journal)
Electronic Resource
Unknown
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