Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 16, issue 11
Articles | Volume 16, issue 11
https://doi.org/10.5194/gmd-16-3291-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-16-3291-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 16, issue 11
Development and technical paper
 | 
13 Jun 2023
Development and technical paper |  | 13 Jun 2023

An improved subgrid channel model with upwind-form artificial diffusion for river hydrodynamics and floodplain inundation simulation

Youtong Rong, Paul Bates, and Jeffrey Neal

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Short summary
A novel subgrid channel (SGC) model is developed for river–floodplain modelling, allowing utilization of subgrid-scale bathymetric information while performing computations on relatively coarse grids. By including adaptive artificial diffusion, potential numerical instability, which the original SGC solver had, in low-friction regions such as urban areas is addressed. Evaluation of the new SGC model through structured tests confirmed that the accuracy and stability have improved.
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