Hazard maps typically show flood extent corresponding to a certain Hazard maps from hydrodynamic or hydraulic models (Ward et al., 2020). Riverine flood risk studies traditionally outline flood-prone zones with (Lindersson et al., 2020) navigating among these offers might be Open-access global maps are providing a variety of alternative products Useful for detecting risk hotspots across the world and may also be usedįor local studies in data-poor regions (UN SDSN, 2020 Ward et al., 2015). Global maps of flood-prone zones and human settlements are Zones is important since increased exposure is a key driver of flood risk Our ability to map population growth within flood-prone Thousands of lives and causing substantial economic damage every year (CREDĪnd UNDRR, 2020). The findings of this study indicate that hydrogeomorphic floodplain maps can be a valuable way of producing high-resolution maps of flood-prone zones to support riverine flood risk studies, but caution should be taken in regions that are dry, steep, very flat, or near the coast.įlood disasters are a major cause of loss throughout the globe, claiming We also map riverine flood exposure for 26 countries across the global south by intersecting these maps with three human population maps (Global Human Settlement population grid, hereinafter GHS High Resolution Settlement Layer, hereinafter HRSL and WorldPop). Contrary to expectations, the agreement between the two flood hazard maps is lower compared to their agreement with the hydrogeomorphic floodplain map. This agreement is highly variable across model combinations and geographic conditions, influenced by climatic humidity, river volume, topography, and coastal proximity. We find an average spatial agreement between these maps of around 30 % at the river basin level on a global scale. The Global Assessment Report on Disaster Risk Reduction 2015, hereinafter GAR). Riverine flood exposure from three global products: a hydrogeomorphicįloodplain map (GFPLAIN250m, hereinafter GFPLAIN) and two flood hazard maps (Flood Hazard Map of the World by the European Commission's Joint Research Centre, hereinafter JRC, and the flood hazard maps produced for (hydrologically derived) flood hazard maps or (topography-based) This modelling process can be based on either Riverine flood risk studies often require the identification of areas prone
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