Evaporation m (Water Overlay): Difference between revisions

Revision as of 14:53, 8 July 2026

Attribute	Unit	Description
EVAPORATION_M	end-time, m	An array of values, each pair indicating until what time that period of evaporation will last and what amount evaporates in that period.

An array of maximum 10.000 values (5.000 pairs) can be defined.
Internally each period with amount values are converted to an evaporation rate per second at a particular time in the simulation.
The default value is set to 0.125 mm in 2 hours (0.000125 m in 7200 seconds), which corresponds to 1.5 mm per day. This value is derived from the theory described in 2.3 Gewasverdamping^[1] in the book Grondwaterzakboekje, which combines the formula of Makkink with a temperature dependent factor^[2] (which is approximately linear between 0 and 24 C). Based on the reference evaporation graph^[3], the rate was averaged for March, June, and September during cloudy, rainy days typical of heavy rainfall events.

↑ Grondwaterzakboekje, Gwz2016 (Impressed druk en print) ∙ Makkink, Bram Bot (2016) ∙ Page(s): 2.3 Gewasverdamping, Referentiegewasverdamping
↑ Grondwaterzakboekje, Gwz2016 (Impressed druk en print) ∙ Makkink, Bram Bot (2016) ∙ Page(s): Tabel 2.3 Benadering van $\frac{Δ}{Δ + γ}$ en $\frac{γ}{Δ + γ}$
↑ Grondwaterzakboekje, Gwz2016 (Impressed druk en print) ∙ Makkink, Bram Bot (2016) ∙ Page(s): Fig. 2.7 referentiegewasverdamping

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 * An array of maximum {{array max|pairs}} can be defined.
 * Internally each period with amount values are converted to an evaporation rate per second at a particular time in the simulation.
-* The default value is set to 0.125 mm in 2 hours (0.000125 m in 7200 seconds), which corresponds to '''1.5 mm per day'''. This value is derived from the theory described in 2.3 Gewasverdamping{{ref|GWZ2016}} in the book Grondwaterzakboekje, which combines the formula of Makkink with a temperature dependent factor{{ref|GWZ2016-2}} (which is approximately linear between 0 and 24 C). Based on the graph{{ref|GWZ2016-3}} with plotted lines of reference evaporation for certain months and cloudiness. The evaporation rate was selected as an average of march, june and september, for a cloudy rainy day, which corresponds to a heavy rainfall event.
+* The default value is set to 0.125 mm in 2 hours (0.000125 m in 7200 seconds), which corresponds to '''1.5 mm per day'''. This value is derived from the theory described in 2.3 Gewasverdamping{{ref|GWZ2016}} in the book Grondwaterzakboekje, which combines the formula of Makkink with a temperature dependent factor{{ref|GWZ2016-2}} (which is approximately linear between 0 and 24 C). Based on the reference evaporation graph{{ref|GWZ2016-3}}, the rate was averaged for March, June, and September during cloudy, rainy days typical of heavy rainfall events.
 |seealso=
 * [[Water evaporation factor (Water Overlay)]]