Journal of Food, Agriculture and Environment

A method for prediction of the van Genuchten water retention curve

Author(s):

Chunming Chi

Recieved Date: 2014-02-02, Accepted Date: 2014-04-02

Abstract:

The soil gravimetric water contents (θ) at saturation(θ _s) and at field capacity (θ _fc) and soil water suction (h) at field capacity (h_fc) were used to estimate the parameters α and n in the van Genuchten water retention model for soil water characteristic curves. This new method is called as ‘inflection point method’. Five soils ranging from sandy loam to clay were used to test the method. Soil water characteristic curves estimated by the inflection point method are in good agreement with measured characteristic curves. The inflection point method provides a simple approach to estimate the parameters in van Genuchten model of soil water characteristic curve instead of the usual equilibrium method.

Keywords:

Soil water content at field capacity, soil water suction at field capacity, inflection point

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Environment
Pages: 762-765

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