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Using sub-grid-scale topographic information to parameterise a probability-distributed runoff-production scheme for regional climate modelling

Dadson, Simon; Bell, Vicky. 2007 Using sub-grid-scale topographic information to parameterise a probability-distributed runoff-production scheme for regional climate modelling. Geophysical Research Abstracts, 9, 08291.

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Abstract/Summary

Fully-coupled regional climate models require the representation of hydrological pro- cesses at spatial scales coarser than the scale over which topographic variability influ- ences water fluxes. It is possible to retain sub-grid-scale information by constructing a parameterised representation of fine resolution topography. Here we describe a procedure that can be used to infer catchment and grid-pixel hydro- logical properties from existing topographic and geomorphic datasets. This procedure permits the calculation of the probability distribution of soil moisture stores within a grid pixel or a catchment. The new scheme is demonstrated in use as a hydrological sub-component of a regional climate/land-surface model. As well as improving the representation of hydrological processes in coarse resolution gridded flow models, the work may provide a physically-based method of providing enhanced calibration of hydrological models in ungauged basins using readily available geomorphic data.

Item Type: Publication - Article
Programmes: CEH Programmes pre-2009 publications > Water > WA01 Water extremes
CEH Sections: Harding (to 31.07.11)
Date made live: 20 Apr 2011 15:44
URI: http://nora.nerc.ac.uk/id/eprint/9103

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