Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Digital elevation analysis for distributed hydrological modeling : Reducing scale dependence in effective hydraulic conductivity values. / Saulnier, Georges Marie; Beven, Keith; Obled, Charles.
In: Water Resources Research, Vol. 33, No. 9, 01.1997, p. 2097-2101.Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Digital elevation analysis for distributed hydrological modeling
T2 - Reducing scale dependence in effective hydraulic conductivity values
AU - Saulnier, Georges Marie
AU - Beven, Keith
AU - Obled, Charles
PY - 1997/1
Y1 - 1997/1
N2 - 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.
AB - 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.
U2 - 10.1029/97WR00652
DO - 10.1029/97WR00652
M3 - Journal article
AN - SCOPUS:0030749013
VL - 33
SP - 2097
EP - 2101
JO - Water Resources Research
JF - Water Resources Research
SN - 0043-1397
IS - 9
ER -