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Fig. 4. Result maps of the modeling (10 years flood scenario); Left: maximum water
depth. Right: maximum flow velocity.
generate additional parameter maps that could be of use for the assessment
of damage and risk, for instance maps showing the propagation of the flood,
the kinetic energy of the flood water, the estimated duration, etc. The model
shows an increase in the inundation extent of about 50% from flood with a
return period of 2 years to the largest flood with a return period of 50 years.
Multi-parameter hazard assessment
Indicator maps produced from modeling were further processed to create
flood hazard maps. Understanding that the level of flood hazard cannot
be measured by single parameter, a hazard categorization was made based
on work from Penning-Rowsell and Tunstall, 6 who proposed three hazard
categories based on a combination of flow velocity and water depth (Fig. 5).
The resulted hazard zonation for five return periods is shown in Fig. 6
Conclusions
A combined 1D2D model is an ideal tool to simulate riverine floods in low-
land and river delta river areas. It combines the strengths of 1D catchment
models that simulates flow within the riverbed with the possibility to study
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