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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : A swot analysis of hydrodynamic models with respect to simulating breaching
A swot analysis of hydrodynamic models with respect to simulating breaching
Author : M. VAN DAMME(1) & P.J. VISSER(2)
ABSTRACT
Deriving the bed shear stresses from hydrodynamic models in breach models is challenging due to the continuous
changing hydraulic head over the breach in combination with horizontal and vertical flow contractions, and the continuous
rapidly changing breach geometry. Three stages can be distinguished in breach flows. Stage 1 initiates when the
embankment starts to overflow and is characterized by flows over the embankment crest and down the landside slope.
Stage 2 initiates when the landside slope has retreated towards the waterside slope. The hydraulic head increases rapidly
and the flow contracts both horizontally and vertically resulting in a fully 3-dimensional flow. During Stage 3 a full breach
has developed and the flow contracts mainly horizontally. This paper presents a SWOT analysis of flow modelling
methods applied in breach models to derive the bed shear stresses. The paper shows that for a number of cases
analytical methods are more accurate than numerical methods due to the fact that they give a more accurate description
of the shear stresses on the embankment surface, whereas for some numerical methods errors are found of the order of
50%.
File Size : 358,340 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 18/08/2015
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