varwg.meteo.meteox2y.haude

varwg.meteo.meteox2y.haude(svp, vp, mon)[source]

calculates the evapotranspiration following Haude (1955) [1] as described in the Hydrologie-I-Skript

Parameters:
svpfloat or numpy.array of floats

saturation vapour pressure [hPa], measured at 2pm

vpfloat or numpy.array of floats

vapour pressure [hPa], measured at 2pm

monint or numpy.array of ints

month: 1=january, 12=december

Returns:
etpfloat or numpy.array of floats

evapotranspiration [mm] daily values

See also

turc

potential evapotranspiration following Turc

Notes

The Haude formula is only valid in temperate humid climate

References

[1]

Haude, W. (1955): Zur Bestimmung der Verdunstung auf moeglichst einfache Weise. - Mitt. Dt. Wetterd. 2 (11), Bad Kissingen (Dt. Wetterd.)

Examples

>>> haude(12.28,8.83,5)
1.0005

>>> haude(12.28,8.83,12)
0.759

>>> svp = np.array([11.87809345,  12.28364703,  12.70132647])
>>> vp = np.array([8.55222728,  8.84422586,  9.14495506])
>>> haude(svp,vp,12)
array([0.73169056,  0.75667266,  0.78240171])

>>> mon = np.array([2,3,4])
>>> haude(svp,vp,mon)
array([0.73169056,  0.75667266,  1.03134771])