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4.2.3. SUEWS_Conductance.txt

SUEWS_Conductance.txt contains the parameters needed for the Jarvis (1976) [Ja76] surface conductance model used in the modelling of evaporation in SUEWS. These values should not be changed independently of each other. The suggested values below have been derived using datasets for Los Angeles and Vancouver (see Järvi et al. (2011) [J11]) and should be used with gsModel = 1. An alternative formulation ( gsModel =2) uses slightly different functional forms and different coefficients (with different units).

No. Column Name Use Description
1 Code L Code linking to a corresponding look-up table.
2 G1 MD Related to maximum surface conductance [mm s-1]
3 G2 MD Related to Kdown dependence [W m-2]
4 G3 MD Related to VPD dependence [units depend on gsModel]
5 G4 MD Related to VPD dependence [units depend on gsModel]
6 G5 MD Related to temperature dependence [°C]
7 G6 MD Related to soil moisture dependence [mm-1]
8 TH MD Upper air temperature limit [°C]
9 TL MD Lower air temperature limit [°C]
10 S1 MD A parameter related to soil moisture dependence [-]
11 S2 MD A parameter related to soil moisture dependence [mm]
12 Kmax MD Maximum incoming shortwave radiation [W m-2]
13 gsModel MD Formulation choice for conductance calculation.

An example SUEWS_Conductance.txt can be found below:

1    2       3        4      5      6       7      8  9   10   11 12   13
Code G1      G2       G3     G4     G5      G6     TH TL  S1   S2 Kmax gsModel
100  16.4764 566.0923 0.2163 3.3649 11.0764 0.0176 40 0   0.45 15 1200 1       ! Default Jarvi et al. (2011) gsModel=1
200  3.5     200      0.13   0.7    30      0.05   55 -10 5.56 0  1200 2       ! Updated Ward  et al. (2016) gsModel=2
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