The function spwb_ldrCalibration calibrates the species root
distribution within spwb, given the arguments x, meteo,
psi_crit, obs and calibVar. This calibration
is based on reference measured values. These reference measured values can be
Soil water content, Total tranpiration or Transpiration by
cohort. Return the calibrated root distribution for each tree species (no
shrub calibration is done), expressed as parameters of the function
root_ldrDistribution.
spwb_ldrCalibration(x, meteo, calibVar, obs,
RZmin = 301, RZmax = 4000,
V1min = 0.01, V1max = 0.94, resolution = 20, heat_stop = 0,
transformation = "identity", verbose = FALSE)THe function returns a data frame containing the species index used in medfate, calibrated values for Z50, Z95 and V1 and the MAE value for that combination.
An object of class spwbInput.
A data frame with daily meteorological data series.
A character string indicating the calibration variable to be used.
It can be one of the following: SWC, Eplanttot
or Cohorts.
Measured calibration variable. Depending on the value of calibVar
it can be a numeric vector with the measured SWC values (if
calibVar = "SWC"), or a data frame with the first column
containing the measured total transpiration (named Eplanttot) and
the following columns containing the cohorts transpiration.
The minimum value of RZ (the rooting depth) to be explored (in mm)
The maximum value of RZ (the rooting depth) to be explored (in mm)
The minimum value of V1 (the root proportion in the first soil layer) to be explored
The maximum value of V1 (the root proportion in the first soil layer) to be explored
An integer defining the number of values to obtain by discretization of the root parameters RZ and V1. The number of parameter combinations and therefore the computation cost increases increase with the square of resolution
Function to modify the size of Z intervals to be explored (by default, bins are equal).
An integer defining the number of days during to discard from the calculation of the optimal root distribution. Usefull if the soil water content initialization is not certain
A logical value. Print the internal messages of the function?
Víctor Granda, CREAF
Antoine Cabon, CTFC-CREAF
Miquel De Cáceres Ainsa, CREAF
This function performs three different kinds of calibration, selecting those
root distribution parameters that minimize the MAE between the predicted values
and the measured values provided in obs argument. If calibVar = "SWC" different
V1 values are tested running spwb maintaining the total soil depth
provided in x and assuming that value is also the depth containing 95 percent of the
roots. If calibVar = "Eplanttot" or calibVar = 'Cohorts' different
combinations of RZ and V1 values are tested for each tree cohort and the root
paramters are selected based on the MAE between the total transpiration or the
cohort transpiration.
spwb_ldrOptimization for when no measured data is available,
spwb, soil, root_ldrDistribution