Predictions of two popular closed-form models for unsaturated hydraulic conductivity (K) are compared with in situ measurements made in a sandy loam field soil. Whereas the Van Genuchten model estimates were very close to field measured values, the Brooks-Corey model predictions were higher by about one order of magnitude in the wetter range. Estimation of parameters of the Van Genuchten soil moisture characteristic (SMC) equation, however, involves the use of non-linear regression techniques. The Brooks-Corey SMC equation has the advantage of being amenable to application of linear regression techniques for estimation of its parameters from retention data. A conversion technique, whereby known Brooks-Corey model parameters may be converted into Van Genuchten model parameters, is formulated. The proposed conversion algorithm may be used to obtain the parameters of the preferred Van Genuchten model from in situ retention data, without the use of non-linear regression techniques.

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dc.contributor.authorNandagiri, L.
dc.contributor.authorPrasad, R.
dc.date.accessioned2026-02-05T11:00:35Z
dc.date.issuedField evaluation of unsaturated hydraulic conductivity models and parameter estimation from retention data
dc.description.abstract1996
dc.identifier.citationJournal of Hydrology, 1996, 179, 46113, pp. 197-205
dc.identifier.issn221694
dc.identifier.urihttps://doi.org/10.1016/0022-1694(95)02840-4
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/28065
dc.publisherElsevier
dc.subjectMathematical models
dc.subjectParameter estimation
dc.subjectRegression analysis
dc.subjectSoil testing
dc.subjectBrooks-Corey model
dc.subjectSoil moisture characteristic equation
dc.subjectUnsaturated hydraulic conductivity
dc.subjectVan Genuchten model
dc.subjectHydraulic conductivity
dc.subjectField Tests
dc.subjectHydraulic Conductivity
dc.subjectModels
dc.subjectSoils
dc.subjectUnsaturated
dc.titlePredictions of two popular closed-form models for unsaturated hydraulic conductivity (K) are compared with in situ measurements made in a sandy loam field soil. Whereas the Van Genuchten model estimates were very close to field measured values, the Brooks-Corey model predictions were higher by about one order of magnitude in the wetter range. Estimation of parameters of the Van Genuchten soil moisture characteristic (SMC) equation, however, involves the use of non-linear regression techniques. The Brooks-Corey SMC equation has the advantage of being amenable to application of linear regression techniques for estimation of its parameters from retention data. A conversion technique, whereby known Brooks-Corey model parameters may be converted into Van Genuchten model parameters, is formulated. The proposed conversion algorithm may be used to obtain the parameters of the preferred Van Genuchten model from in situ retention data, without the use of non-linear regression techniques.

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