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Accounting For Spatially Variable Infiltration in Border Irrigation Models
Author(s) -
Jaynes D. B.,
Clemmens A. J.
Publication year - 1986
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr022i008p01257
Subject(s) - infiltration (hvac) , log normal distribution , irrigation , environmental science , soil science , hydrology (agriculture) , mathematics , geology , statistics , geotechnical engineering , meteorology , geography , ecology , biology
In this paper we describe a simple combination of variances technique for incorporating the spatial variability of infiltration rates into the irrigation uniformity predictions of border irrigation models. The mean and variance of the depth of infiltrated water across a border can be calculated directly from the infiltration opportunity time results of a single border irrigation simulation and the distributions of the infiltration parameters for the border. Infiltration depth results are not needed. The single irrigation simulation is run using the expected values for the infiltration parameters to describe uniform infiltration across the border. We also show how these results can be used to calculate the irrigation distribution uniformity coefficient DU , where care must be used if the depths of infiltration are assumed normally distributed. Although only normal and lognormal distributions are discussed, the techniques described can be applied to any infiltration parameter distribution.