Description Usage Arguments Details Value Author(s) References See Also Examples
View source: R/Evapotranspiration.R
Implementing the Priestley-Taylor formulation for potential evaporation
1 2 3 |
data |
A list which contains the following items (climate variables) required by Priestley-Taylor formulation: |
constants |
A list named The following constants are also required when argument |
ts |
Must be either |
solar |
Must be either |
alpha |
Any numeric value between 0 and 1 (dimensionless), albedo of evaporative surface representing the portion of the incident radiation that is reflected back at the surface. |
message |
Must be either |
AdditionalStats |
"yes" or "no" indicating whether monthly averaged and annual averaged ET should be calculated. |
save.csv |
Must be either |
... |
Dummy for generic function, no need to define. |
The alternative calculation options can be selected through argument solar
, please see Arguments
for details.
User-defined evaporative surface is allowed through argument alpha
, please see Arguments
for details.
The function generates a list containing the following components, which is saved into a csv
file named as ET_PriestleyTaylor.csv in the working directory:
ET.Daily |
Daily aggregated estimations of Priestley-Taylor potential evaporation. |
ET.Monthly |
Monthly aggregated estimations of Priestley-Taylor potential evaporation. |
ET.Annual |
Annually aggregated estimations of Priestley-Taylor potential evaporation. |
ET.MonthlyAve |
Monthly averaged estimations of daily Priestley-Taylor potential evaporation. |
ET.AnnualAve |
Annually averaged estimations of daily Priestley-Taylor potential evaporation. |
ET_formulation |
A character string containing the name of the formulation used which equals to |
ET_type |
Type of the estimation obtained which is |
message1 |
A message to inform the users about how solar radiation has been calculated by using which data. |
Danlu Guo
McMahon, T., Peel, M., Lowe, L., Srikanthan, R. & McVicar, T. 2012. Estimating actual, potential, reference crop and pan evaporation using standard meteorological data: a pragmatic synthesis. Hydrology and Earth System Sciences Discussions, 9, 11829-11910.
Priestley, C. & Taylor, R. 1972, On the assessment of surface heat flux and evaporation using large-scale parameters'. Monthly Weather Review, vol. 100, no. 2, pp. 81-92.
ET
,processeddata
,defaultconstants
,constants
1 2 3 4 5 6 7 | # Use processed existing data set and constants from kent Town, Adelaide
data("processeddata")
data("constants")
# Call ET.PriestleyTaylor under the generic function ET
results <- ET.PriestleyTaylor(processeddata, constants, ts="daily",
solar="sunshine hours", alpha=0.23, message="yes", AdditionalStats="yes", save.csv="no")
|
Loading required package: zoo
Attaching package: ‘zoo’
The following objects are masked from ‘package:base’:
as.Date, as.Date.numeric
Priestley-Taylor Potential ET
Evaporative surface: user-defined, albedo = 0.23
Sunshine hour data have been used for calculating incoming solar radiation
Timestep: daily
Units: mm
Time duration: 2001-03-01 to 2004-08-31
1280 ET estimates obtained
Basic stats
Mean: 2.76
Max: 6.22
Min: 0.62
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