Interpreting the manning roughness coefficient in overland flow simulations with coupled hydrological-hydraulic distributed models
There is still little experience on the effect of the Manning roughness coefficient in coupled hydrological-hydraulic distributed models based on the solution of the Shallow Water Equations (SWE), where the Manning coefficient affects not only channel flow on the basin hydrographic network but also...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/358185 |
| Acceso en línea: | https://hdl.handle.net/2117/358185 https://dx.doi.org/10.3390/w13233433 |
| Access Level: | acceso abierto |
| Palabra clave: | Runoff Basin hydrology Numerical modelling Rainfall-runoff-overland flow models Coupled hydrological-hydraulic distributed modelling Manning roughness coefficient Escolament Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia |
| Sumario: | There is still little experience on the effect of the Manning roughness coefficient in coupled hydrological-hydraulic distributed models based on the solution of the Shallow Water Equations (SWE), where the Manning coefficient affects not only channel flow on the basin hydrographic network but also rainfall-runoff processes on the hillslopes. In this kind of model, roughness takes the role of the concentration time in classic conceptual or aggregated modelling methods, as is the case of the unit hydrograph method. Three different approaches were used to adjust the Manning roughness coefficient in order to fit the results with other methodologies or field observations—by comparing the resulting time of concentration with classic formulas, by comparing the runoff hydrographs obtained with aggregated models, and by comparing the runoff water volumes with observations. A wide dispersion of the roughness coefficients was observed to be generally much higher than the common values used in open channel flow hydraulics. |
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