Preprints
https://doi.org/10.5194/gmd-2021-340
https://doi.org/10.5194/gmd-2021-340

Submitted as: development and technical paper 18 Oct 2021

Submitted as: development and technical paper | 18 Oct 2021

Review status: this preprint is currently under review for the journal GMD.

Tracing and visualisation of contributing water sources in the LISFLOOD-FP model of flood inundation

Matthew D. Wilson1,2 and Thomas J. Coulthard3 Matthew D. Wilson and Thomas J. Coulthard
  • 1Geospatial Research Institute | Toi Hangarau, University of Canterbury, New Zealand
  • 2School of Earth and Environment | Te Kura Aronukurangi, University of Canterbury, New Zealand
  • 3Department of Geography, Geology and Environment, University of Hull, United Kingdom

Abstract. We describe the formulation of a simple method of water source tracing for computational models of flood inundation and demonstrate its implementation within CAESAR-Lisflood. Water source tracing can provide additional insight into flood dynamics by accounting for flow pathways. The method developed is independent of the hydraulic formulation used, allowing it to be implemented in other model codes without affecting flow routing. In addition, we developed a method which allows up to three water sources to be visualised in RGB colour-space, while continuing to allow depth to be resolved. We show the application of the methods developed for example applications of a major flood event, a shallow estuary, and Amazonian wetland inundation. A key advantage of the formulation developed is that the number of water sources which may be traced is limited only by computational considerations. In addition, the method is independent of the hydraulic formulation, meaning that it is relatively straightforward to add to existing finite volume codes including those based on or developed around the LISFLOOD-FP method.

Matthew D. Wilson and Thomas J. Coulthard

Status: open (until 13 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2021-340', Anonymous Referee #1, 08 Nov 2021 reply
  • CEC1: 'Comment on gmd-2021-340', Astrid Kerkweg, 18 Nov 2021 reply

Matthew D. Wilson and Thomas J. Coulthard

Model code and software

CAESAR-Lisflood v1.8f-WS (water source tracing and visualisation) Wilson, M. D. and Coulthard, T. J. https://doi.org/10.5281/zenodo.5541123

Video supplement

Tracing and visualisation of contributing water sources in a model of flood inundation: video supplement Wilson, M. D. and Coulthard, T. J. https://doi.org/10.5281/zenodo.5548535

Matthew D. Wilson and Thomas J. Coulthard

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Short summary
The source of water which contributes to a location inundated during a flood event can influence the impacts caused, for example as a result of contaminants within the water. However, methods to trace water sources are currently only available in complex hydraulic models, which are computationally expensive. We propose a simplified method which can be added to efficient, reduced-complexity model codes, enabling an improved understanding of flood dynamics at large spatial scales.