Global flood exposure from different sized rivers
Open Access
- 16 September 2021
- journal article
- research article
- Published by Copernicus GmbH in Natural Hazards and Earth System Sciences
- Vol. 21 (9), 2829-2847
- https://doi.org/10.5194/nhess-21-2829-2021
Abstract
There is now a wealth of data to calculate global flood exposure. Available datasets differ in detail and representation of both global population distribution and global flood hazard. Previous studies of global flood risk have used datasets interchangeably without addressing the impacts using different datasets could have on exposure estimates. By calculating flood exposure to different sized rivers using a model-independent geomorphological river flood susceptibility map (RFSM), we show that limits placed on the size of river represented in global flood models result in global flood exposure estimates that differ by more than a factor of 2. The choice of population dataset is found to be equally important and can have enormous impacts on national flood exposure estimates. Up-to-date, high-resolution population data are vital for accurately representing exposure to smaller rivers and will be key in improving the global flood risk picture. Our results inform the appropriate application of these datasets and where further development and research are needed.Keywords
Funding Information
- UK Research and Innovation (NE/R008949/1)
This publication has 54 references indexed in Scilit:
- Global flood risk under climate changeNature Climate Change, 2013
- Global exposure to river and coastal flooding: Long term trends and changesGlobal Environmental Change, 2012
- Height Above the Nearest Drainage – a hydrologically relevant new terrain modelJournal of Hydrology, 2011
- How Close Do We Live to Water? A Global Analysis of Population Distance to Freshwater BodiesPLOS ONE, 2011
- A physically based description of floodplain inundation dynamics in a global river routing modelWater Resources Research, 2011
- New Global Hydrography Derived From Spaceborne Elevation DataEos, 2008
- Floodplain Morphometry Extraction From a High-Resolution Digital Elevation Model: A Simple Algorithm for Regional Analysis StudiesIEEE Geoscience and Remote Sensing Letters, 2006
- Flood Defense in The NetherlandsWater International, 2005
- On the extraction of channel networks from digital elevation dataHydrological Processes, 1991
- Where do channels begin?Nature, 1988