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Importance of river bank and floodplain slopes on the accuracy of flood inundation mapping
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management. (geomatik / geomatics)ORCID iD: 0000-0002-3884-3084
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management. (geomatik / geomatics)ORCID iD: 0000-0002-3906-6088
2012 (English)In: River Flow 2012: Volume 2 / [ed] Rafael Murillo Muñoz, Leiden, The Netherlands: CRC Press / Balkema (Taylor & Francis) , 2012, 1015-1020 p.Conference paper, Published paper (Refereed)
Abstract [en]

Effective flood assessment and management depend on accurate models of flood events, which in turn are strongly affected by the quality of digital elevation models (DEMs). In this study, HEC-RAS was used to route one specificwater discharge through the main channel of the Eskilstuna River, Sweden. DEMs with various resolutions and accuracies were used to model the inundation. The results showed a strong positive relationship between the quality of theDEMand the extent of the inundation. However, evenDEMswith the highest resolution produced inaccuracies. In another case study, the Testebo River, the model settings could be calibrated, thanks to a surveyed old inundation event. However, even with the calibration efforts, the resulting inundation extents showed varying degrees of deviation from the surveyed flood boundaries. Therefore, it becomes clear that not only does the resolution of the DEM impact the quality of the results; also, the floodplain slope perpendicular to the river flow will impact the modelling accuracy. Flatter areas exhibited the greatest predictive uncertainties regardless of the DEM’s resolution. For perfectly flat areas, uncertainty becomes infinite.

Place, publisher, year, edition, pages
Leiden, The Netherlands: CRC Press / Balkema (Taylor & Francis) , 2012. 1015-1020 p.
Keyword [en]
Flood Inundation, Geographical Information Systems (GIS), LiDAR, Digital Elevation Models (DEM)
National Category
Other Civil Engineering Ocean and River Engineering Remote Sensing Oceanography, Hydrology, Water Resources
Identifiers
URN: urn:nbn:se:hig:diva-12942ISI: 000347871500135Scopus ID: 2-s2.0-84867959207ISBN: 978-0-415-62129-8 (print)ISBN: 978-0-203-07635-4 (print)ISBN: 978-1-4665-7552-3 (print)OAI: oai:DiVA.org:hig-12942DiVA: diva2:553169
Conference
International Conference on Fluvial Hydraulics. River Flow 2012. San José, Costa Rica, 5-7 September 2012
Projects
DaGIS, GLOBESKvalitetsbeskrivning av geografisk information vid översvämningskartering
Note

Partly financed by the European Union through Swedish Agency for Economic and Regional Growth (Tillväxtverket) (project number 151092).

Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2015-10-06Bibliographically approved

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CiteExportLink to record
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