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Flood map boundary ...
Flood map boundary sensitivity due to combined effects of DEM resolution and roughness in relation to model performance
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- Lim, Nancy Joy, 1980- (författare)
- Högskolan i Gävle,Samhällsbyggnad,Geospatial Information Science
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- Brandt, S. Anders, 1970- (författare)
- Högskolan i Gävle,Samhällsbyggnad,Geospatial Information Science
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(creator_code:org_t)
- 2019-06-24
- 2019
- Engelska.
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Ingår i: Geomatics, Natural Hazards and Risk. - : Taylor & Francis. - 1947-5705 .- 1947-5713. ; 10:1, s. 1613-1647
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Abstract
Ämnesord
Stäng
- In comprehending flood model results, we performed sensitivity analyses and evaluated how different combinations of digital elevation model (DEM) resolution and Manning’s roughness affect flood maps produced from a 2D hydraulic model. Moreover, we analysed how the estimation of accuracy can further be influenced by the performance measure and the area’s topography. Various combinations of DEM and Manning’s n produced different results, in terms of quantified performance in relation to actual flood extent and the generated flood boundaries. High-resolution DEMs performed better with higher Manning’s n, while lower n values were better for lower resolution DEMs. Furthermore, although lower resolution DEMs (25 and 50 m) received higher quantified performances, there are more discrepancies in the flood maps and water surface elevations (WSE) produced by them. The current statistical estimators of model performance do not necessarily provide an accurate estimate of which combination of DEM resolution and roughness are more suitable for application to modelling. Different statistical estimates have different assumptions, which can affect the model selection. Therefore, a more holistic approach towards model selection should be adopted that gives equal importance to statistical estimators, as well as the quality of flood inundation extents.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
Nyckelord
- DEM
- flood
- GIS
- goodness of fit
- hydraulic modelling
- Manning’s n
- sensitivity analysis
- Hållbar stadsutveckling
- Sustainable Urban Development
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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