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Title: | Interactions between subgrid-scale resolution, feature representation and grid-scale resolution in flood inundation modelling |
Authors: | Yu, Dapeng Lane, Stuart N. |
Keywords: | Fluvial flood modelling Diffusion-based modelling Subgrid-scale treatment Feature representation Spatial resolution |
Issue Date: | 2011 |
Publisher: | © John Wiley and Sons |
Citation: | YU, D. and LANE, S.N., 2011. Interactions between subgrid-scale resolution, feature representation and grid-scale resolution in flood inundation modelling. Hydrological Processes, 25 (1), pp.36-53. |
Abstract: | Numerical modelling of flood inundation over large and complex floodplains often requires mesh
resolutions coarser than the structural features (e.g. buildings) that are known to influence the
inundation process. Recent research has shown that this mismatch is not well represented by
conventional roughness treatments but that finer scale features can be represented through porositybased
sub grid scale treatments. This paper develops this work by testing the interactions between
feature representation, sub grid scale resolution and mesh resolution. It uses as the basis for this
testing a 2D diffusion-based flood inundation model which is applied to a 2004 flood event in a
topologically-complex upland floodplain in northern England. Results showed serious degradation of
model predictions without explicit representation of features like walls. Inclusion of such features
through raising mesh cell elevations where intersected by a feature resulted in a major improvement in
model predictions in terms of reduced inundation extent. To make such treatments physically realistic,
and notably so that the full potential for floodplain storage is included, it was shown that a sub grid
scale treatment also needed to be included. The effects of this combined treatment was the recovery of
more plausible floodplain friction values as well as a sensitivity to friction that allows for more
effective representation of floodplain friction effects such as vegetation. |
Description: | This is the pre-peer reviewed version of the article which has been published in final form at: http://dx.doi.org/10.1002/hyp.7813 |
Version: | Submitted for publication |
DOI: | 10.1002/hyp.7813 |
URI: | https://dspace.lboro.ac.uk/2134/13024 |
Publisher Link: | http://dx.doi.org/10.1002/hyp.7813 |
ISSN: | 0885-6087 |
Appears in Collections: | Published Articles (Geography and Environment)
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