An upscaling approach was developed for simulating soil water flow in horizontal heterogeneous unsaturated zone at field scale under flood irrigation. Based on the assumption of stream tube model and the van Genuchten-Mualem soil hydraulic function with five parameters Ks, [alpha], n, [theta]r...

The additive model is an effective dimension-reduction approach that also provides flexibility in modeling the relation between a response variable and key covariates. The literature is largely developed to scalar response and vector covariates. In this article, more complex data are of...