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Transient Soil Surface Sealing and Infiltration Model for Bare Soil Under Droplet Impact.

King, B.A. and Bjorneberg, D.L. (2012) Transient Soil Surface Sealing and Infiltration Model for Bare Soil Under Droplet Impact. Transactions of the ASAE. 55(3):937-945. 9 July 2012. American Society of Agricultural and Biological Engineers. ISSN 0001-2351

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The marked reduction in infiltration rate caused by formation of a soil surface seal due to water droplet impact on bare soil is a well known phenomenon but is rarely considered in infiltration models, especially under center pivot irrigation. Water application rates under center pivot irrigation commonly exceed infiltration rate, especially near the end of the system lateral. This can lead to off-site runoff and erosion, but more importantly results in field-scale non-uniform water infiltration that can substantially reduce water use efficiency of these irrigation systems. The objective of this study was to develop a sealing soil infiltration model that considers transient soil seal formation on a 30 min or less time scale and can potentially be applied to center pivot sprinkler irrigation systems. A sealing soil infiltration model was developed using an explicit finite difference solution scheme with a transient soil seal formation model, which is unique from other studies in that it explicitly uses droplet specific power as the driving factor for formation of a soil surface seal. The form of the transient seal formation model is also unique in that it is expressed as a rational function of specific power rather than an exponential decay function of droplet kinetic energy. The model was applied to published runoff data from two rainfall simulation studies with varying droplet kinetic energies and application rates on three soils. The sealing soil infiltration model represented measured infiltration rates very well for all rainfall simulator tests.

Item Type: Article
NWISRL Publication Number: 1425
Subjects: Irrigation > Sprinkler irrigation
Irrigation > Sprinkler irrigation > Infiltration
Depositing User: Users 6 not found.
Date Deposited: 11 Jul 2012 17:18
Last Modified: 11 Jul 2012 17:18
Item ID: 1460