Evapotranspiration (version 1.10)

ET.McGuinnessBordne: McGuinness-Bordne Formulation

Description

Implementing the McGuinness-Bordne formulation for estimating potential evapotranspiration.

Usage

# S3 method for McGuinnessBordne
ET(data, constants, ts="daily", …)

Arguments

data

A list of data which contains the following items (climate variables) required by McGuinness-Bordne formulation: Tmax, Tmin

constants

A list named constants consists of constants required for the calculation of Jensen-Haise formulation which must contain the following items: Elev - ground elevation above mean sea level in m, lambda - latent heat of vaporisation = 2.45 MJ.kg^-1, lat_rad - latitude in radians, Gsc - solar constant = 0.0820 MJ.m^-2.min^-1.

ts

Must be either daily, monthly or annual, which indicates the disired time step that the output ET estimates should be on. Default is daily.

…

Dummy for generic function, no need to define.

Value

The function prints a calculation summary to the screen containing the following elements: - ET model name and ET quantity estimated - Time step of the output ET estimates (i.e. the value of argument ts) - Units of the output ET estimates - Time duration of the ET estimation - Number of ET estimates obtained in the entire time-series - Basic statistics of the estimated ET time-series including mean, max and min values.

The function also generates a list containing the following components, which is saved into a csv file named as ET_McGuinnessBordne.csv in the working directory:

ET.Daily

Daily aggregated estimations of McGuinness-Bordne potential evapotranspiration.

ET.Monthly

Monthly aggregated estimations of McGuinness-Bordne potential evapotranspiration.

ET.Annual

Annually aggregated estimations of McGuinness-Bordne potential evapotranspiration.

ET.MonthlyAve

Monthly averaged estimations of daily McGuinness-Bordne potential evapotranspiration.

ET.AnnualAve

Annually averaged estimations of daily McGuinness-Bordne potential evapotranspiration.

ET_formulation

Name of the formulation used which equals to McGuinness-Bordne.

ET_type

Type of the estimation obtained which is Potential Evapotranspiration.

Details

This formulation provides a single calculation method with no alternatives available.

References

Oudin, L., Hervieu, F., Michel, C., Perrin, C., Andreassian, V., Anctil, F.Loumagne, C. 2005, Which potential evapotranspiration input for a lumped rainfall-runoff model?: Part 2-Towards a simple and efficient potential evapotranspiration model for rainfall-runoff modelling. Journal of Hydrology, vol. 303, no. 1-4, pp. 290-306.

Xu, C.Y.Singh, V.P. 2000, Evaluation and generalization of radiation-based methods for calculating evaporation., Hydrological Processes, vol. 14, no. 2, pp. 339-349.

See Also

ET,data,defaultconstants,constants

Examples

# NOT RUN {
# Use processed existing data set and constants from kent Town, Adelaide
data("processeddata")
data("constants")

# Call ET.McGuinnessBordne under the generic function ET
results <- ET.McGuinnessBordne(data, constants, ts="daily")
# }