cal_Kr_for_DualKc {simET}

Dimensionless evaporation reduction coefficient

Description

It dependent on the soil water depletion (cumulative depth of evaporation) from the topsoil layer (Kr = 1 when De,i-1 is equal or lesser than REW)

Usage

cal_Kr_for_DualKc(TEW, REW, De)

Arguments

TEW

maximum cumulative depth of evaporation (depletion) from the soil surface layer when Kr = 0 (TEW = total evaporable water)

REW

cumulative depth of evaporation (depletion) at the end of stage 1 (REW = readily evaporable water), mm

De

cumulative depth of evaporation (depletion) from the soil surface layer at the end of day i-1 (the previous day),mm

Value

A value for evaporation reduction coefficient

References

Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. FAO Irrigation and drainage paper No. 56. Rome: Food and Agriculture Organization of the United Nations, 1998.