Sub-grid scale parameterisation of 2D hydrodynamic models of inundation in the urban area

Sylvian Neelz, Gareth Pender

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    23 Citations (Scopus)


    This paper presents preliminary results from a study considering the parameterisation of coarse-grid 2D flood models to take into account sub-grid scale flow patterns occurring in the urban area. A simulation of a severe flood in an urbanized coastal floodplain is first run using a fine grid that can resolve the flow around and between buildings. Next, the same model is run again using the same underlying topography, although stripped from any buildings, and a set of 7 values of the roughness parameter (Manning's n), all larger than (or equal to) the value used in the original run. A further set of simulations is carried out using a five-fold increased grid cell size. It is found that while it may be possible to model the overall effects of the buildings using strongly increased roughness parameter values, using a coarse grid otherwise has implications related to the loss of information about the site topography that results in flood flow routes being incorrectly modelled. © Institute of Geophysics, Polish Academy of Sciences 2007.

    Original languageEnglish
    Pages (from-to)65-72
    Number of pages8
    JournalActa Geophysica
    Issue number1
    Publication statusPublished - Mar 2007


    • 2D hydrodynamic models
    • Roughness parameterisation
    • Urban flood modelling


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