Abstract
Studying model uncertainty and identifying the parameter uncertainty in the modeling of water flow through the soil is useful to improve water and soil management. This research aimed to assess the uncertainty of the parameters of soil water retention curve (SWRC) models using an efficient hybrid of the Monte Carlo technique e.g. generalized likelihood uncertainty estimation (GLUE). GLUE estimates the parameters of vanGenuchten, vanGenuchten-Mualem, and vanGenuchten-Burdine models for four soil classes. Also, to evaluate the relative importance of the model parameters, generalized sensitivity analysis (GSA) was performed. The results of the uncertainty analysis showed that among the studied models, the vanGenuchten-Mualem model with the indices of S = 0.05, T = 0.4, d-factor = 0.25 and, PCI = 100 was considered as the most accurate model with the least uncertainty. Also, the results of GSA were demonstrated that alpha and n parameters were sensitive parameters in the models. Consequently, identifying the uncertainty of the SWRC model structure and its parameters, relevant models with higher accuracy can be used in the study of soil water processes, and better water resource allocation.
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04 December 2020
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05 February 2021
A Correction to this paper has been published: https://doi.org/10.1007/s10596-020-10024-z
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Highlights
• The GLUE method is an appropriate method to evaluate parameters uncertainty of soil water retention curves.
• S and T indices have more performance than confidence interval criteria to evaluate the models uncertainty.
• the GSA method was able to determine the sensitivity of the model parameters in each studied soil texture class.
• “n” parameter is the most sensitive parameter in three models.
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Etminan, S., Jalali, V., Mahmoodabadi, M. et al. Assessing an efficient hybrid of Monte Carlo technique (GSA-GLUE) in Uncertainty and Sensitivity Analysis of vanGenuchten Soil Moisture Characteristics Curve. Comput Geosci 25, 503–514 (2021). https://doi.org/10.1007/s10596-020-10019-w
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DOI: https://doi.org/10.1007/s10596-020-10019-w