Description Usage Arguments Details Value Author(s) References See Also Examples
View source: R/Evapotranspiration.R
Implementing the Blaney-Criddle formulation for estimating reference crop evapotranspiration.
1 2 3 |
data |
A list of data which contains the following items (climate variables) required by Blaney-Criddle formulation: |
constants |
A list named |
ts |
Must be either |
solar |
Must be either |
height |
Must be |
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.
Height adjustment for the estimations is available through argument height
, please see Arguments
for details.
The function generates a list containing the following components:
ET.Daily |
Daily aggregated estimations of Blaney-Criddle reference crop evapotranspiration. |
ET.Monthly |
Monthly aggregated estimations of Blaney-Criddle reference crop evapotranspiration. |
ET.Annual |
Annually ggregated estimations of Blaney-Criddle reference crop evapotranspiration. |
ET.MonthlyAve |
Monthly averaged estimations of daily Blaney-Criddle reference crop evapotranspiration. |
ET.AnnualAve |
Annually averaged estimations of daily Blaney-Criddle reference crop evapotranspiration. |
ET_formulation |
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. |
message3 |
A message to inform the users about if height adjustment has been applied to calculated Blaney-Criddle reference crop evapotranspiration. |
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.
Allen, R.G.Brockway, C.E. 1983, Estimating consumptive use on a statewide basis. Advances in Irrigation and Drainage@ sSurviving External Pressures, ASCE, pp. 79-89.
Allen, R. & Pruitt, W. 1986. Rational Use of The FAO Blaney-Criddle Formula. Journal of Irrigation and Drainage Engineering, 112, 139-155.
Frevert, D.K., Hill, R.W.Braaten, B.C. 1983, Estimation of FAO evapotranspiration coefficients, Journal of Irrigation and Drainage Engineering, vol. 109, no. 2, pp. 265-270.
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.BlaneyCriddle under the generic function ET
results <- ET.BlaneyCriddle(processeddata, constants, ts="daily", solar="sunshine hours",
height= FALSE, 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
Blaney-Criddle Reference Crop ET
Evaporative surface: reference crop
Sunshine hour data have been used for calculating incoming solar radiation
No height adjustment has been applied to calculated Blaney-Criddle reference crop evapotranspiration
Timestep: daily
Units: mm
Time duration: 2001-03-01 to 2004-08-31
1280 ET estimates obtained
Basic stats
Mean: 1.73
Max: 7.66
Min: -0.51
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