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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/13024

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)

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