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Infiltration in Swelling Soils
Author(s) -
Giraldez Juan V.,
Sposito Garrison
Publication year - 1985
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/wr021i001p00033
Subject(s) - ponding , infiltration (hvac) , swelling , soil water , geotechnical engineering , richards equation , hydraulic conductivity , soil science , mathematics , mechanics , geology , materials science , composite material , physics , drainage , biology , ecology
Infiltration phenomena in swelling soils were investigated theoretically. The approach taken consisted of applying both the approximate analytical techniques developed by J.‐Y. Parlange and co‐workers and conventional finite difference numerical methods to study the generalized Richards equation for one‐dimensional infiltration in a swelling soil. Equations were derived for the ponding time and the post‐ponding infiltration rate that are generalizations of the Parlange‐Smith model expressions for rigid soils. Ponding times for swelling soils were shown to be shorter than those for nonswelling analogs, and post‐ponding infiltration rates in swelling soils were shown to approach zero instead of becoming equal to the hydraulic conductivity, as in rigid soils. These results were confirmed, both qualitatively and quantitatively, with the numerical model, which also provided instantaneous moisture profiles and surface swelling predictions in agreement with field observations. A three‐parameter infiltration equation proposed recently by J.‐Y. Parlange et al. (1982) was generalized to describe swelling soils and shown to be in good agreement with published laboratory and field data. It appears that the generalized analytical model equations developed can be employed conveniently in hydrologic applications which do not require high accuracy in predictions.