Air entrapment and consolidation occurring with saturated hydraulic conductivity changes with intermittent wetting |
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| Authors: | R M Seymour |
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| Institution: | (1) Bio-Resource Engineering, Department of Biosystems Science and Engineering, University of Maine, 5710 BRE, Norm Smith Hall, Orono, ME 04469-5710, USA e-mail: rseymour@umenfa.maine.edu Tel.: +1-207-5812727; Fax: +1-207-5812725, US |
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| Abstract: | A study was designed to measure air entrapment and consolidation as mechanisms that might contribute to reduced hydraulic
conductivity with intermittent wetting similar to surge irrigation cycles. The changes in hydraulic conductivity with intermittent
wetting would result in infiltration rate changes. Air entrapment and consolidation in a surface layer sample of 50 mm was
the focus of the study. During drainage periods between successive wettings, pressure head gradients within the surface layer
samples were controlled to simulate drainage in a field situation. Air entrapment was found to occur consistently with reduction
in saturated hydraulic conductivity while consolidation was not as consistent in its response with changes in saturated hydraulic
conductivity.
Received: 16 February 1999 |
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