Importance of river bank and floodplain slopes on the accuracy of flood inundation mapping [Elektronisk resurs]

• 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. 

Ämnesord

Engineering and Technology  (hsv)

Civil Engineering  (hsv)

Other Civil Engineering  (hsv)

Teknik och teknologier  (hsv)

Samhällsbyggnadsteknik  (hsv)

Annan samhällsbyggnadsteknik  (hsv)

Engineering and Technology  (hsv)

Environmental Engineering  (hsv)

Ocean and River Engineering  (hsv)

Teknik och teknologier  (hsv)

Naturresursteknik  (hsv)

Havs- och vattendragsteknik  (hsv)

Engineering and Technology  (hsv)

Environmental Engineering  (hsv)

Remote Sensing  (hsv)

Teknik och teknologier  (hsv)

Naturresursteknik  (hsv)

Fjärranalysteknik  (hsv)

Natural Sciences  (hsv)

Earth and Related Environmental Sciences  (hsv)

Oceanography, Hydrology and Water Resources  (hsv)

Naturvetenskap  (hsv)

Geovetenskap och miljövetenskap  (hsv)

Oceanografi, hydrologi och vattenresurser  (hsv)

NATURAL SCIENCES  (svep)

Earth sciences  (svep)

Atmosphere and hydrosphere sciences  (svep)

Hydrology  (svep)

NATURVETENSKAP  (svep)

Geovetenskap  (svep)

Atmosfärs- och hydrosfärsvetenskap  (svep)

Hydrologi  (svep)

NATURAL SCIENCES  (svep)

Earth sciences  (svep)

Exogenous earth sciences  (svep)

Physical geography  (svep)

NATURVETENSKAP  (svep)

Geovetenskap  (svep)

Exogen geovetenskap  (svep)

Naturgeografi  (svep)

FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING  (svep)

Area technology  (svep)

Remote sensing  (svep)

SKOGS- och JORDBRUKSVETENSKAP samt LANDSKAPSPLANERING  (svep)

Areell teknik  (svep)

Fjärranalys  (svep)

TECHNOLOGY  (svep)

Civil engineering and architecture  (svep)

Surveying  (svep)

TEKNIKVETENSKAP  (svep)

Samhällsbyggnadsteknik och arkitektur  (svep)

Lantmäteri  (svep)

INTERDISCIPLINARY RESEARCH AREAS  (svep)

Water in nature and society  (svep)

TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN  (svep)

Vatten i natur och samhälle  (svep)

Genre

government publication  (marcgt)

Indexterm och SAB-rubrik

Flood Inundation

Geographical Information Systems (GIS)

LiDAR

Digital Elevation Models (DEM)