Season formula (Water Overlay): Difference between revisions

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The season fraction and index are variables used for calculating the transpiration factor in the [[Ground evaporation formula (Water Overlay)|Ground evaporation formula]]. It uses the configured [[Start date ms (Water Overlay)|start date]] of a [[Water Overlay]] and selected months and day of months to determine one of the four configured (seasonal) [[Water evaporation (Function Value)|evaporation factors]].
The season fraction and index are variables used for calculating the transpiration factor in the [[Ground evaporation formula (Water Overlay)|Ground evaporation formula]]. It uses the configured [[Start date ms (Water Overlay)|start date]] of a [[Water Overlay]] and selected months and day of months to determine one of the four configured (seasonal) [[Water evaporation (Function Value)|evaporation factors]].


Evaporation month indices:
Evaporation month, day of month and corresponding evaporation factor value:
{| class=wikitable
{| class=wikitable
! Month
! Month

Revision as of 11:03, 27 February 2024

The season fraction and index are variables used for calculating the transpiration factor in the Ground evaporation formula. It uses the configured start date of a Water Overlay and selected months and day of months to determine one of the four configured (seasonal) evaporation factors.

Evaporation month, day of month and corresponding evaporation factor value:

Month Day of Month Transpiration value
March 15 1st
April 15 2nd
July 15 3rth
September 15 4th
October 1 1st

Evaporation factor graphs

The evaporation graphs showing the evaporation factor as a percentage per day. These are based on Table 2.10 Cropfactors[1] of the Gwz2016 book. The approximated graphs use five control points (see the season table above) per type, such that it can be reduced to four values per year.

  • Seasonal evap grass.jpg
  • Seasonal evap corn.jpg
  • Seasonal evap potato.jpg
  • Seasonal evap beet.jpg
  • Seasonal evap grain.jpg
  • Seasonal evap orchard.jpg
  • Seasonal evap heather.jpg

Notes

  • The growth season dates are determined based on western european growth and transpiration graphs of the following crops and plants: grass, corn, potato, beet, grain, orchard and heather.

See also

References

  1. ↑ Table 2.10 Gewasfactoren, % van referentiegewasverdamping van Makkink, Bram Bot (2016) ∙ Grondwaterzakboekje, Gwz2016 ∙ Impressed druk en print


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