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.

Highlights

  • Flood inundation models relate upstream river inflow and other dynamic boundary conditions to inundation extent, depth and velocity, and have become invaluable tools for the assessment and understanding of flood dynamics and risk

  • 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

  • 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 10 LISFLOOD-FP method

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Summary

Introduction

Flood inundation models relate upstream river inflow and other dynamic boundary conditions (e.g. downstream stage) to inundation extent, depth and velocity, and have become invaluable tools for the assessment and understanding of flood dynamics and risk. A series of fast and effective two dimensional hydrodynamic models have been developed (Hunter et al, 15 2007; Neal et al, 2018) These model codes have enabled assessment of flood inundation at high spatial resolutions (e.g. Yu and Coulthard, 2015) and large spatial scales including applications on the Amazon (Wilson et al, 2007) and Congo (O’Loughlin et al, 2020), at continental scales (Dottori et al, 2021; Wing et al, 2017) and global (Dottori et al, 2016; Sampson et al, 2015). Understanding the contribution of different water sources to flooding and river flows is important when managing river basins, for example determining the relative contribution of tributaries or where water borne contamination is an issue. We focus only on surface water, and develop a method for the visualisation of water sources

Flow formulation
Water source tracing
Water tracing implementation
Water source visualisation
Results
Carlisle, United Kingdom
Computational performance
Discussion
Conclusions
Findings
355 Acknowledgements
Full Text
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