12 Jun 2023
 | 12 Jun 2023
Status: a revised version of this preprint is currently under review for the journal NHESS.

Assessing the next generation of Global Flood Models in the Central Highlands of Vietnam

Laurence Hawker, Jeffrey Neal, James Savage, Thomas Kirkpatrick, Rachel Lord, Yanos Zylberberg, Andre Groeger, Truong Dang Thuy, Sean Fox, Felix Agyemang, and Khanh Pham Nam

Abstract. Flooding is an endemic global challenge with annual damages totalling billions of dollars. Impacts are felt most acutely in in low and middle-income countries, where rapid demographic change is driving increased exposure. These areas also tend to lack high precision hazard mapping data with which to better understand or manage risk. To address this information gap a number of Global Flood Models have been developed in recent years. However, there is substantial uncertainty over the performance of these data products. Arguably the most important component of a Global Flood Model is the Digital Elevation Model (DEM), which must represent the terrain without surface artifacts such as forests and buildings. Here we develop and evaluate a next generation of global hydrodynamic flood model based on the recently released FABDEM DEM. We evaluate the model and compare to a previous version using the MERIT DEM at three study sites in the central highlands of Vietnam using two independent validation data sets based on a household survey and remotely sensed observations of recent flooding. The global flood model based on FABDEM consistently outperformed a model based on MERIT, and the agreement between the model and remote sensing was greater than the agreement between the two validation data sets.

Laurence Hawker et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2023-93', Anonymous Referee #1, 19 Jun 2023
    • AC1: 'Reply on RC1', Laurence Hawker, 21 Jun 2023
  • RC2: 'Comment on nhess-2023-93', Anonymous Referee #2, 26 Jun 2023
    • AC2: 'Reply on RC2', Laurence Hawker, 24 Jul 2023

Laurence Hawker et al.

Data sets

Fluvial and pluvial flood maps for the central highlands of Vietnam and surrounding provinces, 2022 Laurence Hawker; Jeffrey Neal; Pham Khanh Nam

Laurence Hawker et al.


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Short summary
A global flood model built using a new terrain dataset and evaluated in the central highlands of Vietnam.