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Digital elevation analysis for distributed hydrological modeling: Reducing scale dependence in effective hydraulic conductivity values

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>01/1997
<mark>Journal</mark>Water Resources Research
Issue number9
Number of pages5
Pages (from-to)2097-2101
Publication StatusPublished
<mark>Original language</mark>English


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 κ = In(α/tarβ) 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.