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Title: SCALE-DEPENDENT PEDOTRANSFER FUNCTIONS

Author
item Pachepsky, Yakov
item Rawls, Walter
item Timlin, Dennis

Submitted to: American Geophysical Union
Publication Type: Abstract Only
Publication Acceptance Date: 2/4/2000
Publication Date: 3/2/2000
Citation: N/A

Interpretive Summary: None.

Technical Abstract: Estimating soil hydraulic parameters from readily available soil data becomes an important part of hydrologic simulations and assessments. A review of the scale effects on such estimation will be presented to discuss: (1) experimental data on differences in soil hydraulic parameters at different scales; (2) examples of the need in different parameter values sfor existing soil water transport models applied at different scales; (3) upscaling pedotransfer functions with the second-order linearization; (4) limitations of regression-based techniques in estimating soil hydraulic properties found by solving inverse problems; (5) effect of scales on the selection of basic parameters to be included in pedotransfer functions, in particular, parameters of soil structure, topography, and land use; (6) using stochastic imaging to infer scale effects in hydraulic properties and pedotransfer functions; (7) using models that have a scale parameter explicitly included in the formulation so that pedotransfer functions have to be developed only a particular scale.