A comparison of three dual drainage models: Shallow Water vs Local Inertial vs Diffusive Wave
Martins, R; Leandro, J; Chen, AS; et al.Djordjevic, S
Date: 24 January 2017
Journal
Journal of Hydroinformatics
Publisher
IWA Publishing
Publisher DOI
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Abstract
In this study we compared three overland flow models, a full dynamic model (SWE), a local
inertial equations model (GWM), and a diffusive wave model (PDWAVE). The three models are
coupled with the same full dynamic sewer network model (SIPSON). We adopted the volume
exchange between sewer and overland flow models, and the hydraulic ...
In this study we compared three overland flow models, a full dynamic model (SWE), a local
inertial equations model (GWM), and a diffusive wave model (PDWAVE). The three models are
coupled with the same full dynamic sewer network model (SIPSON). We adopted the volume
exchange between sewer and overland flow models, and the hydraulic head and discharge
rates at the linked manholes to evaluate differences between the models. For that purpose we
developed a novel methodology based on RGB scale. The test results of a real case study show
a close agreement between coupled models in terms of the extents of flooding, depth and
volume exchanged, despite highly complex flows and geometries. The diffusive wave model
gives slightly higher maximum flood depths and a slower propagation of the flood front when
compared to the other two models. The Local inertial model shows to slight extent higher
depths downstream as the wave front is slower than the one in the fully dynamic model.
Overall, the simplified overland models can produce comparable results to fully dynamic
models with less computational cost
Engineering
Faculty of Environment, Science and Economy
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