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

Lancaster Environment Centre

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Digital elevation analysis for distributed hydrological modelling: reducing scale dependence in effective hydraulic conductivity values. / Saulnier, Georges-Marie; Beven, Keith J.; Obled, Charles.
In: Water Resources Research, Vol. 33, No. 9, 1997, p. 2097-2101.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{565b8f01e1c645b298942c0a971a6ae8,

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

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.",

author = "Georges-Marie Saulnier and Beven, {Keith J.} and Charles Obled",

year = "1997",

language = "English",

volume = "33",

pages = "2097--2101",

journal = "Water Resources Research",

issn = "0043-1397",

publisher = "AMER GEOPHYSICAL UNION",

number = "9",

}

RIS

TY - JOUR

T1 - Digital elevation analysis for distributed hydrological modelling: reducing scale dependence in effective hydraulic conductivity values.

AU - Saulnier, Georges-Marie

AU - Beven, Keith J.

AU - Obled, Charles

PY - 1997

Y1 - 1997

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 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.

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 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.

M3 - Journal article

VL - 33

SP - 2097

EP - 2101

JO - Water Resources Research

JF - Water Resources Research

SN - 0043-1397

IS - 9

ER -

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