Season formula (Water Overlay): Difference between revisions
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The season fraction and index are variables used for calculating the [[ | 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 | Evaporation month, day of month and corresponding evaporation factor array value: | ||
{| class=wikitable | {| class=wikitable | ||
! Month | ! Month | ||
! Day of Month | ! Day of Month | ||
! Transpiration value | |||
|- | |- | ||
| March | | March | ||
| 15 | | 15 | ||
| 1st | |||
|- | |- | ||
| April | | April | ||
| 15 | | 15 | ||
| 2nd | |||
|- | |- | ||
| July | | July | ||
| 15 | | 15 | ||
| 3rth | |||
|- | |- | ||
| September | | September | ||
| 15 | | 15 | ||
| 4th | |||
|- | |- | ||
| October | | October | ||
| 1 | | 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''<ref name="GWZ2016"></ref> 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. Values between the control points are obtained by interpolation. | |||
<gallery> | |||
File:seasonal_evap_grass.jpg | |||
File:seasonal_evap_corn.jpg | |||
File:seasonal_evap_potato.jpg | |||
File:seasonal_evap_beet.jpg | |||
File:seasonal_evap_grain.jpg | |||
File:seasonal_evap_orchard.jpg | |||
File:seasonal_evap_heather.jpg | |||
</gallery> | |||
[[File:function_table_evaporation_factors.png|frame|left|Evaporation factors in the [[function table]] in the [[editor]]]] | |||
{{article end | |||
|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. | |||
|seealso= | |||
* [[Ground evaporation formula (Water Overlay)]] | |||
* [[Start date ms (Water Overlay)]] | |||
* [[Water evaporation factor (Water Overlay)]] | |||
|references= | |||
<references> | |||
<ref name="GWZ2016">Table 2.10 Gewasfactoren, % van referentiegewasverdamping van Makkink, Bram Bot (2016) ∙ Grondwaterzakboekje, Gwz2016 ∙ Impressed druk en print</ref> | |||
</references> | |||
}} | |||
{{WaterOverlay formula nav}} | |||
Latest revision as of 12:15, 28 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 array 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. Values between the control points are obtained by interpolation.
Evaporation factors in the function table in the editor
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
- Ground evaporation formula (Water Overlay)
- Start date ms (Water Overlay)
- Water evaporation factor (Water Overlay)
References
- ↑ Table 2.10 Gewasfactoren, % van referentiegewasverdamping van Makkink, Bram Bot (2016) ∙ Grondwaterzakboekje, Gwz2016 ∙ Impressed druk en print
- Models
- Surface • Ground • Rain • Evaporation • Infiltration • Elevation • Breach • Sewer • Storage • Tracer flow • Border • Order
- Model formulas
- Timestep • Season • Surface water level • Groundwater level
- Flow formulas
- Surface flow • Surface infiltration • Ground flow • Ground infiltration • Surface evaporation • Ground evaporation • Ground bottom flow
- Hydraulic structure formulas
- Culvert • Weir • Breach growth • Breach flow • Pump • Sewer Overflow • Inlet • Drainage
- Related