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Flux‐Concentration Relation‐Based Solution of Constant‐Flux Infiltration Equation: I. Infiltration into Nonuniform Initial Moisture Profiles
Author(s) -
Boulier J. F.,
Touma J.,
Vauclin M.
Publication year - 1984
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1984.03615995004800020004x
Subject(s) - infiltration (hvac) , flux (metallurgy) , richards equation , water content , hydraulic conductivity , soil science , moisture , constant (computer programming) , soil water , thermodynamics , mechanics , materials science , chemistry , environmental science , geotechnical engineering , physics , geology , composite material , programming language , metallurgy , computer science
The quasi‐analytical solution of the infiltration equation based on the flux‐concentration relation for constant flux condition and initially uniform water content profile is extended here to nonuniform moisture profiles for fluxes either smaller or greater than the saturated hydraulic conductivity. In the latter case, the solution is developed for the postponding stage. It is shown that the measured flux‐concentration relation is well‐approximated by F (θ*) = θ* and that no significant time dependence can be observed. The quasi‐analytical solution is then successfully compared with both laboratory experiments performed on a sandy soil column and numerical solution of the Richards equation for the nonponding, preponding, and postponding stages of infiltration.