Preprints
https://doi.org/10.5194/gmd-2022-259
https://doi.org/10.5194/gmd-2022-259
Submitted as: model description paper
26 Oct 2022
Submitted as: model description paper | 26 Oct 2022
Status: this preprint is currently under review for the journal GMD.

LISFLOOD-FP 8.1: New GPU accelerated solvers for faster fluvial/pluvial flood simulations

Mohammad Kazem Sharifian1,2, Georges Kesserwani1, Alovya Ahmed Chowdhury1, Jeffrey Neal3, and Paul Bates3 Mohammad Kazem Sharifian et al.
  • 1Department of Civil and Structural Engineering, The University of Sheffield, Western Bank, Sheffield, UK
  • 2Risk Management Solutions Ltd., London, UK
  • 3School of Geographical Sciences, University of Bristol, Bristol, UK

Abstract. The local inertial two-dimensional (2D) flow model on LISFLOOD-FP, so-called ACC uniform grid solver, has been widely used to support fast, computationally efficient fluvial/pluvial flood simulations. This paper describes new releases, on LISFLOOD-FP 8.1, for parallelised flood simulations on the graphical processing units (GPU) to boost efficiency of the existing parallelised ACC solver on the central processing units (CPU) and enhance it further by enabling a new non-uniform grid version. The non-uniform solver generates its grid using the multiresolution analysis (MRA) of the multiwavelets (MWs) to a Galerkin projection of the digital elevation model (DEM). This sensibly coarsens the resolutions where the local topographic details are below an error threshold ε and allows to properly adapt classes of land use. Both the grid generator and the adapted ACC solver on the non-uniform grid are implemented in a GPU new codebase, using the indexing of Z-order curves alongside a parallel tree traversal approach. The efficiency performance of the GPU parallelised uniform and non-uniform grid solvers are assessed for five case studies, where the accuracy of the latter is explored for ε = 10-4 and 10-3 in terms of how close it can reproduce the prediction of the former.

Mohammad Kazem Sharifian et al.

Status: open (until 21 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2022-259', Anonymous Referee #1, 21 Nov 2022 reply
  • RC2: 'Comment on gmd-2022-259', Ilhan Özgen-Xian, 29 Nov 2022 reply

Mohammad Kazem Sharifian et al.

Mohammad Kazem Sharifian et al.

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Short summary
This paper describes a new release for LISFLOOD-FP model for fast and efficient flood simulations. The model features a new non-uniform grid generator that uses multiwavelet analyses to sensibly coarsens the resolutions where the local topographic variations are smooth. Moreover, the model is parallelised on the graphical processing units (GPU) to further boost computational efficiency. The performance of the model is assessed for five real-world case studies, noting its potential applications.