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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Acknowledgments
The authors thank Dr John Hornbuckle CSIRO Land & Water for permission to use his furrow irrigation data.
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Communicated by T. Trooien
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Gillies, M.H., Smith, R.J. & Raine, S.R. Accounting for temporal inflow variation in the inverse solution for infiltration in surface irrigation. Irrig Sci 25, 87–97 (2007). https://doi.org/10.1007/s00271-006-0037-9
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DOI: https://doi.org/10.1007/s00271-006-0037-9