Cook, F. J. and Knight, J. H. and Doble, R. C. and Raine, S. R. (2012) An improved solution for the infiltration advance problem in irrigation hydraulics. Irrigation Science . ISSN 0342-7188 (In Press)
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Identification Number or DOI: doi: 10.1007/s00271-012-0392-7
The irrigation advance problem in irrigation hydraulics has been spread across the engineering and soil science literature over a number of decades. The Lewis-Milne framework has been used extensively, but one problem has been to find a suitable infiltration equation. The infiltration advance solutions of Philip and Farrell, and Collis-George and Freebairn are compared to a new solution based on the linear soil infiltration equation. It is shown that the linear soil solution is able to give similar results to the Philip and Farrell solution at early stages of infiltration when this is valid, and the Collis-George and Freebairn solution at longer times when this is valid. The linear soil infiltration advance solution presented here is the first using physically meaningful parameters which is able to give adequate infiltration and advance behaviour over all time scales. To further test the linear soil concept, we inversely fit irrigation advance data to get the sorptivity, saturated hydraulic conductivity and infiltration rate behaviour of the soil using all three infiltration equations. The linear soil is shown to give the best fit for the infiltration behaviour to the measured results with an average r 2 of 0.98 compared to 0.84 for Philip and Farrell and 0.77 for Collis-George and Freebairn. The linear soil model was also the best fit using other statistical tests such as RMSE and RSR.
|Item Type:||Article (Commonwealth Reporting Category C)|
|Additional Information:||Published online Oct 2012. Permanent restricted access to ArticleFirst version in accordance with the copyright policy of the publisher.|
|Fields of Research (FOR2008):||09 Engineering > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling|
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040608 Surfacewater Hydrology
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
|Socio-Economic Objective (SEO2008):||D Environment > 96 Environment > 9610 Natural Hazards > 961005 Natural Hazards in Fresh, Ground and Surface Water Environments|
|Deposited On:||22 Oct 2012 11:46|
|Last Modified:||24 Jan 2013 16:25|
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