net.simplace.client.simulation.lap.lintul.Functions

public static HashMap PENMAN(double DAVTMP, double VP, double DTR, double
LAI, double WN, double RNINTC);

Computation of the PENMAN EQUATION, daily values of potential evaporation and transpiration

• DAVTMP Daily average temperature
• VP Vapour pressure
• DTR Daily total radiation
• LAI Leaf area index
• WN Wind Speed
• RNINTC interception of rain by the canopy

returns Hashmap with entries "PEVAP" and "PTRAN"

public static HashMap PENMAN(double DAVTMP, double VP, double DTR, double
LAI, double WN, double RNINTC, double fraction);

Computation of the PENMAN EQUATION - fraction of daily values (e.g. hourly) for potential evaporation and transpiration The modified Penman routine calculates sub-daily (e.g. hourly) values for potential transpiration and evaporation. For hourly values use a fraction of 1/24. All inputs must match the corresponding time span. If no sub-daily values are available, one can use daily values for DAVTMP, VP, LAI, WN and (daily DTR)*fraction for DTR and (daily RNINTC)*fraction for RNINTC

• DAVTMP average temperature of the time span (or daily average)
• VP Vapor pressure during time span (or daily average)
• DTR total radiation during time span (or daily total radiation * fraction)
• LAI Leaf area index during time span (or daily average)
• WN Wind Speed during time span (or daily average)
• RNINTC interception of rain by the canopy during time span (or daily interception * fraction)
• fraction The fraction of a day - e.g. 1/24 for hourly values

returns Hashmap with entries "PEVAP" and "PTRAN"