soilhypfit (version 0.1-8)
Modelling of Soil Water Retention and Hydraulic Conductivity
Data
Description
Provides functions for efficiently estimating properties of
the Van Genuchten-Mualem model for soil hydraulic parameters from
possibly sparse soil water retention and hydraulic conductivity data
by multi-response parameter estimation methods
(Stewart, W.E., Caracotsios, M. Soerensen, J.P. (1992)
"Parameter estimation from multi-response data"
). Parameter estimation is simplified
by exploiting the fact that residual and saturated water contents
and saturated conductivity are conditionally linear parameters
(Bates, D. M. and Watts, D. G. (1988)
"Nonlinear Regression Analysis and Its Applications"
).
Estimated parameters are optionally constrained by the evaporation
characteristic length (Lehmann, P., Bickel, S., Wei, Z. and Or, D. (2020)
"Physical Constraints for Improved Soil Hydraulic Parameter
Estimation by Pedotransfer Functions" )
to ensure that the estimated parameters are physically valid.
Common S3 methods and further utility functions allow to process,
explore and visualise estimation results.