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Infiltration and Water Table Effects of Soil Air Pressure Under Border Irrigation
Author(s) -
Linden D. R.,
Dixon R. M.
Publication year - 1973
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/sssaj1973.03615995003700010030x
Subject(s) - infiltration (hvac) , water table , irrigation , groundwater recharge , hydrology (agriculture) , environmental science , soil water , pressure head , groundwater , soil science , geology , aquifer , geotechnical engineering , geography , agronomy , mechanical engineering , engineering , meteorology , biology
Field studies investigated infiltration and water table responses to soil air pressure under border irrigation. The water table was depressed in the center and elevated near the edge of a border strip in response to differences in soil air pressure during an irrigation. Also, water table elevations indicated that infiltration and subsequent groundwater recharge rates were greater in the vicinity of a border dike than at the center of the border. An infiltration response was measured by: (i) venting soil air during an actual irrigation and (ii) pumping air into the soil during simulated irrigations. An actual border irrigation experiment indicated that displaced soil air pressure h a (expressed as equivalent heads of water) rising to values of 13 to 24 cm of H 2 O reduced infiltration over a 70‐min period from 14.3 to 10.3 cm. Simulated border irrigation experiments indicated that displaced soil air pressure h a must exceed surface head h s to have significant influence on infiltration and that the first few minutes of infiltration may determine the h a ‐to‐ h s relationship and subsequent infiltration effects. In the simulated irrigations with h s = 6.3 cm, total infiltration in 1 hour was 6.0 and 1.5 cm when h a was 0 and 10 cm of H 2 O, respectively. Infiltration was only slightly reduced during the first 5 min when h a was 5 cm of H 2 O.