Accounting for temporal inflow variation in the inverse solution for infiltration in surface irrigation

Gillies, Malcolm H. and Smith, R. J. and Raine, Steven R. (2007) Accounting for temporal inflow variation in the inverse solution for infiltration in surface irrigation. Irrigation Science, 25 (2). pp. 87-97. ISSN 0342-7188

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Abstract

A simple modification of the volume balance equation of the IPARM model is presented to facilitate the use of variable inflow. Traditional approaches for estimating infiltration from advance and/or runoff have merely considered the constant or step inflow case. Whenever this assumption is violated, significant uncertainty is introduced into the estimated infiltration parameters. Evaluation of the procedure with a number of data sets has demonstrated significant improvements in the estimates of infiltration parameters. Furthermore, the technique has shown that a portion of the apparent variability in estimated soil intake rates between furrows in the same field is a consequence of the constant inflow assumption. Accounting for the variable inflow to estimate infiltration functions, both standardised the shape of the infiltration curve and reduced the magnitude of the variation between curves. The proposed technique remains restricted by limitations similar to that of other volume balance models but offers greater performance under typical inflow variations often experienced in practice.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Authors' final manuscript version deposited in accordance with the copyright policy of the publisher.
Depositing User: Assoc Prof Steven Raine
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 03 Mar 2008 04:05
Last Modified: 02 Jul 2013 22:59
Uncontrolled Keywords: variable inflow; infiltration; irrigation; IPARM
Fields of Research (FOR2008): 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070105 Agricultural Systems Analysis and Modelling
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
04 Earth Sciences > 0404 Geophysics > 040403 Geophysical Fluid Dynamics
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960905 Farmland, Arable Cropland and Permanent Cropland Water Management
Identification Number or DOI: doi: 10.1007/s00271-006-0037-9
URI: http://eprints.usq.edu.au/id/eprint/3911

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