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Developing joint probability distributions of soil water retention characteristics
Author(s) -
Carsel Robert F.,
Parrish Rudolph S.
Publication year - 1988
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr024i005p00755
Subject(s) - hydraulic conductivity , water content , soil science , vadose zone , environmental science , flow (mathematics) , soil water , probability distribution , joint probability distribution , water flow , regression analysis , geotechnical engineering , mathematics , statistics , geology , geometry
A method is presented for developing probability density functions for parameters of soil moisture relationships of capillary head [ h (θ)] and hydraulic conductivity [ K (θ)]. These soil moisture parameters are required for the assessment of water flow and solute transport in unsaturated media. The method employs a statistical multiple regression equation proposed in the literature for estimating [ h (θ)] or [ K (θ)] relationships using the soil saturated water content and the percentages of sand and clay. In the absence of known statistical distributions for either [ h (θ)] or [ K (θ)] relationships, the method facilitates modeling by providing variability estimates that can be used to examine the uncertainty associated with water flow or solute transport in unsaturated media.