SShort {HydroMe} | R Documentation |
This selfstarting function estimates the infiltration parameters contained in the Hortons model. It has an initial attribute that creates initial estimates of the parameters fc, f0, and k
SShort(input, fc, f0, lrk)
input |
A numeric vector of Time |
fc |
A numeric parameter representing the final steady infiltration capacity |
f0 |
A numeric parameter representing the initial infiltration capacity |
lrk |
A numeric parameter representing the logarithm of the decay constant |
a numeric vector of the same length as input. It is the value of the expression fc+(f0-fc)*exp(-input*lrk) . It represents the fitted estimates of infiltration capacities using the Hortons model
It may be necessary to transform the infiltration capacities to avoid negative values for the asymptotic final steady infiltration capacity
Omuto, Christian Thine
Horton , R.E., 1940 An approach towards a physical interpretation of infiltration capacity Soil Science Society of America Proceedings 5, 227-237
SSphilip, SSGampt
##-- Use infiltration data data(infiltration) hort.nls <-nls(Rate~SShort(Time, fc, f0, lrk), data=infiltration) plot(hort.nls) # to view the assumption of constant variance of the residuals