Finding the Optimum Infiltration and Roughness Parameters in Furrow Irrigation Using Complete Hydrodynamic Model

Document Type : Original Article

Authors

1 - Graduated MSc student of Irrigation and Drainage, Ferdowsi University of Mashhad., Mashhad., Iran

2 - Assistant Professor, Department of Water Engineering, College of Agriculture, Ferdowsi University of Mashhad., Mashhad., Iran

3 Associate Professor, Department of Water Engineering, College of Agriculture, Ferdowsi University of Mashhad., Mashhad., Iran

Abstract

Infiltration and roughness coefficients have significant effect on infiltration and  furrow irrigation simulation. The variability of these coefficients and also wetted perimeter during irrigation and among different irrigations can lead to inaccurate modeling results. Therefore, in this study, the infiltration parameters and roughness coefficient were first estimated using two point method and multilevel calibration method with a complete hydrodynamic model. The effect of scaling method was then evaluated. Two sets of field data, walker and Printz were utilized for the verification of the results. RMSE values for advance phase were reduced from 5/76 to 3/72 for Prints irrigation data with two point method and increased for recession phase from 2/72 to 2/75. This method caused the recession simulation error to increase from 5/99 to 26/98 and the advance error to reduce from 15/18 to 13/23 for walker irrigation data. The scaling method had the similar results to two point method. However, the advance and recession error in both Walker  and Printz irrigations were reduced using the multilevel calibration method.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 8, Issue 3 - Serial Number 47
November and December 2014
Pages 549-555

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