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Upscaling hydraulic conductivity by means of entropy of terrain curvature representation

Niedda, Marcello (2004) Upscaling hydraulic conductivity by means of entropy of terrain curvature representation. Water Resources Research, Vol. 40 (W04206). ISSN 0043–1397. Article.

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DOI: 10.1029/2003WR002721

Abstract

The effects of topography resolution on upscaling point-scale processes and parameters on watershed hydrology numerical routing are investigated. Parsimonious continuous simulation was applied to two forested catchments with shallow and sloping soils, one medium (123 km2) and one small-sized (4.5 km2), where saturation-excess runoff prevails. The computed discharge showed highest sensitivity to spatial resolution, due to smoothing effects during aggregation of the digital elevation model caused by a coarse grid. The loss of information content of terrain curvature as consequence of the averaging procedure was related to the amplification factor required for the soil hydraulic conductivity, to compensate the resulting retardation of the runoff hydrograph. A scaling relation has been developed that links soil hydraulic conductivity measured at the point-scale with that required at the typically much coarser modeling scale. The entropy concept for the measurement of information loss could be a good index for parameter rescaling of other basins where the terrain curvature is similarly scale-dependent.

Item Type:Article
ID Code:3597
Status:Published
Refereed:Yes
Uncontrolled Keywords:Distributed modeling, entropy, finite difference schemes, grid DEM, information content, scale effect
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/08 Idraulica agraria e sistemazioni idraulico-forestali
Divisions:001 Università di Sassari > 01 Dipartimenti > Ingegneria del territorio
Publisher:American Geophysical Union
ISSN:0043–1397
Copyright Holders:© 2004 by the American Geophysical Union
Publisher Policy:Depositato in conformità con la politica di copyright dell'Editore
Deposited On:10 Mar 2010 11:59

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