hour_angle_sunset: Sunset hour angle
In WDNR-Water-Use/CSLSevap: Evapo(transpi)ration Calculations
Description
Usage
Arguments
Value
References
View source: R/radiation_functions.R
Description
Calculates the sunset hour angle (radians) for a given location and day of
the year using Equation 25 from Allen et al. (1998). Identical to Equation
2.2 in Harwell (2012).
Usage
1
hour_angle_sunset(phi, delta)
Arguments
phi
latitude of the location (radians). Positive for northern
hemisphere, negative for southern hemisphere.
delta
the solar declination based on the Julian day (radians)
Value
omega_s
sunset hour angle (radians)
References
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop
evapotranspiration: Guidelines for computing crop water requirements. Rome:
FAO. Retrieved from http://www.fao.org/docrep/X0490E/x0490e00.htm.
Harwell, G.R., 2012, Estimation of evaporation from open water—A
review of selected studies, summary of U.S. Army Corps of Engineers data
collection and methods, and evaluation of two methods for estimation of
evaporation from five reservoirs in Texas: U.S. Geological Survey
Scientific Investigations Report 2012–5202, 96 p.
WDNR-Water-Use/CSLSevap documentation built on April 9, 2021, 1:35 a.m.
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Description Usage Arguments Value References
View source: R/radiation_functions.R
Description
Calculates the sunset hour angle (radians) for a given location and day of the year using Equation 25 from Allen et al. (1998). Identical to Equation 2.2 in Harwell (2012).
Usage
1 | hour_angle_sunset(phi, delta)
|
Arguments
phi |
latitude of the location (radians). Positive for northern hemisphere, negative for southern hemisphere. |
delta |
the solar declination based on the Julian day (radians) |
Value
omega_s |
sunset hour angle (radians) |
References
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration: Guidelines for computing crop water requirements. Rome: FAO. Retrieved from http://www.fao.org/docrep/X0490E/x0490e00.htm.
Harwell, G.R., 2012, Estimation of evaporation from open water—A review of selected studies, summary of U.S. Army Corps of Engineers data collection and methods, and evaluation of two methods for estimation of evaporation from five reservoirs in Texas: U.S. Geological Survey Scientific Investigations Report 2012–5202, 96 p.
R Package Documentation
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Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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