Digital elevation analysis for distributed hydrological modelling: reducing scale dependence in effective hydraulic conductivity values.

Saulnier, Georges-Marie and Beven, Keith J. and Obled, Charles (1997) Digital elevation analysis for distributed hydrological modelling: reducing scale dependence in effective hydraulic conductivity values. Water Resources Research, 33 (9). pp. 2097-2101. ISSN 0043-1397

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Abstract

The recent widespread availability of digital terrain data has made automatic procedures for topographic analyses popular. Previous studies have shown that hydrological models and their effective parameter values are dependent on the resolution of the elevation grid. This paper examines the analysis of raster elevation data within the topography-based model, TOPMODEL, framework. It is demonstrated that the algorithm used in processing channel pixels in calculating the topographic index k = ln(a/tanβ) can have a dramatic effect on the sensitivity of effective parameter values to the grid size. Suggestions are made for calculating the topographic index of channel pixels, consistent with the TOPMODEL assumptions, that strongly decrease the sensitivity of the calibrated effective hydraulic conductivity values to grid size.

Item Type: Journal Article
Journal or Publication Title: Water Resources Research
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/ge
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21951
Deposited By: ep_ss_importer
Deposited On: 16 Feb 2009 14:11
Refereed?: Yes
Published?: Published
Last Modified: 07 Oct 2019 00:29
URI: https://eprints.lancs.ac.uk/id/eprint/21951

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