Sources of uncertainty in flood inundation maps
Journal of Flood Risk Management
By: J. D. Bales and C. R. Wagner
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Abstract
Flood inundation maps typically have been used to depict inundated areas for floods having specific exceedance levels. The uncertainty associated with the inundation boundaries is seldom quantified, in part, because all of the sources of uncertainty are not recognized and because data available to quantify uncertainty seldom are available. Sources of uncertainty discussed in this paper include hydrologic data used for hydraulic model development and validation, topographic data, and the hydraulic model. The assumption of steady flow, which typically is made to produce inundation maps, has less of an effect on predicted inundation at lower flows than for higher flows because more time typically is required to inundate areas at high flows than at low flows. Difficulties with establishing reasonable cross sections that do not intersect and that represent water-surface slopes in tributaries contribute additional uncertainties in the hydraulic modelling. As a result, uncertainty in the flood inundation polygons simulated with a one-dimensional model increases with distance from the main channel.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Sources of uncertainty in flood inundation maps |
| Series title | Journal of Flood Risk Management |
| DOI | 10.1111/j.1753-318X.2009.01029.x |
| Volume | 2 |
| Issue | 2 |
| Year Published | 2009 |
| Language | English |
| Publisher | Wiley-Blackwell Publishing Ltd. |
| Publisher location | Oxford, England |
| Description | 9 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Flood Risk Management |
| First page | 139 |
| Last page | 147 |
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