Articles | Volume 18, issue 3
https://doi.org/10.5194/gmd-18-843-2025
https://doi.org/10.5194/gmd-18-843-2025
Model description paper
 | 
13 Feb 2025
Model description paper |  | 13 Feb 2025

Subgrid corrections for the linear inertial equations of a compound flood model – a case study using SFINCS 2.1.1 Dollerup release

Maarten van Ormondt, Tim Leijnse, Roel de Goede, Kees Nederhoff, and Ap van Dongeren

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Cited articles

Bates, P. D., Horritt, M. S., and Fewtrell, T. J.: A simple inertial formulation of the shallow water equations for efficient two-dimensional flood inundation modelling, J. Hydrol., 387, 33–45, https://doi.org/10.1016/j.jhydrol.2010.03.027, 2010. 
Begmohammadi, A., Wirasaet, D., Silver, Z., Bolster, D., Kennedy, A. B., and Dietrich, J. C.: Subgrid surface connectivity for storm surge modeling, Adv. Water Resour., 153, 103939, https://doi.org/10.1016/j.advwatres.2021.103939, 2021. 
Begmohammadi, A., Wirasaet, D., Poisson, A., Woodruff, J. L., Dietrich, J. C., Bolster, D., and Kennedy, A. B.: Numerical extensions to incorporate subgrid corrections in an established storm surge model, Coast. Eng. J., 65, 175–197, https://doi.org/10.1080/21664250.2022.2159290, 2023. 
Begmohammadi, A., Wirasaet, D., Lin, N., Dietrich, J. C., Bolster, D., and Kennedy, A. B.: Subgrid modeling for compound flooding in coastal systems, Coast. Eng. J., 66, 434–451, https://doi.org/10.1080/21664250.2024.2373482, 2024. 
Brunner, G.: HEC-RAS River Analysis System Version 5.0 – Hydraulic Reference Manual, Hydrologic Engineering Center, Davis, California, US, https://www.hec.usace.army.mil/software/hec-ras/documentation/HEC-RAS 5.0 Reference Manual.pdf (last access: 30 January 2025), 2016. 
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Short summary

Accurate flood risk assessments are crucial for storm protection. To achieve efficiency, computational costs must be minimized. This paper introduces a novel subgrid approach for linear inertial equations (LIEs) with bed level and friction variations, implemented in the Super-Fast INundation of CoastS (SFINCS) model. Pre-processed lookup tables enhance simulation precision with lower costs. Validations show significant accuracy improvement even at coarser resolutions.

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