Evapotranspiration

• es depends on temperature

• ea depends on es and relative humidity

• f either empirical values (?) or equation by Rutema

• two main parts: radiation and vapour pressure deficit (humididty deficit)

-> FAO reference surface method (ET0)

variables:

• net radiation

• temperature

• humidity

• wind speed

• pschrometric constant

similarities with FAO method, ET0 gets multiplied with a factor depending on sealing degree

landscape coefficient methos -> but Litvak et al. 2017 found that effect of VPD is underestimated (Los Angeles)

• adapted SWMM model taking shading effects into account

• changes made to interception and evaporation processes

• plant-specific parameters added

taking sealed surface ration into account

• useful for green spaces

• also value for mixed land including sealed surfaces