This study investigated the impact of different input variables on the predictability of the water content using soil water retention curve (SWRC) models. The particle and aggregate size distribution model parameters were calculated by fitting the Perrier model to the related distributions for 75 soil samples. Nine SWRC models were fitted to the experimental data and their coefficients were obtained. The regression method was used to estimate the coefficients for nine SWRC models at three input levels. Cluster analysis classified the SWRC models into more homogeneous groups according to the accuracy of their predictions. The SWRC estimated using the Gardner model had the highest accuracy, but it was not an appropriate model for the soils because of its low fitting accuracy. Boltzman, Campbell, and Fermi models obtained the highest accuracy after the Gardner model. The Durner model yielded the lowest prediction accuracy due to the lack of correlation between the input variables and coefficients in this model. Thus, the water content predictions obtained using different SWRC models varied because different input variables were employed.
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Research Article|November 04 2015
Effects of various input levels and different soil water retention curve models on water content estimation using different statistical methods
Hossein Bayat
Hossein Bayat
1Department of Soil Science, Faculty of Agriculture, Bu Ali Sina University, Hamedan, Iran
E-mail: h.bayat@basu.ac.ir
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Eisa Ebrahimi
Eisa Ebrahimi
1Department of Soil Science, Faculty of Agriculture, Bu Ali Sina University, Hamedan, Iran
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Hydrology Research (2015) 47 (2): 312-332.
Article history
Received:
June 01 2015
Accepted:
October 05 2015
Citation
Hossein Bayat, Eisa Ebrahimi; Effects of various input levels and different soil water retention curve models on water content estimation using different statistical methods. Hydrology Research 1 April 2016; 47 (2): 312–332. doi: https://doi.org/10.2166/nh.2015.219
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