4.1.1. Scheme options¶

CBLuse

Warning

Not available in this version.

Requirement:

Required

Description:

Determines whether a CBL slab model is used to calculate temperature and humidity.

Configuration:
Value Comments
0
CBL model not used. SUEWS and LUMPS use temperature and humidity provided in the meteorological forcing file.
1
CBL model is used to calculate temperature and humidity used in SUEWS and LUMPS.
SnowUse
Requirement:

Required

Description:

Determines whether the snow part of the model runs.

Configuration:
Value Comments
0
Snow calculations are not performed.
1
Snow calculations are performed.
SOLWEIGUse

Warning

1. Not available in this version.
2. This option will considerably slow down the model since SOLWEIG is a 2D model.
Requirement:

Required

Description:

Determines whether a high resolution radiation model to calculate mean radiant temperate should be used (SOLWEIG).

Configuration:
Value Comments
0
SOLWEIG calculations are not performed.
1
SOLWEIG calculations are performed. A grid of mean radiant temperature (Tmrt) is calculated based on high resolution digital surface models.
NetRadiationMethod
Requirement:

Required

Description:

Determines method for calculation of radiation fluxes.

Configuration:
Value Comments
0 Uses observed values of Q* supplied in meteorological forcing file.
1 Q* modelled with L↓ observations supplied in meteorological forcing file. Zenith angle not accounted for in albedo calculation.
2 Q* modelled with L↓ modelled using cloud cover fraction supplied in meteorological forcing file (Loridan et al. 2011 [L2011]). Zenith angle not accounted for in albedo calculation.
3 Q* modelled with L↓ modelled using air temperature and relative humidity supplied in meteorological forcing file (Loridan et al. 2011 [L2011]). Zenith angle not accounted for in albedo calculation.
100 Q* modelled with L↓ observations supplied in meteorological forcing file. Zenith angle accounted for in albedo calculation. SSss_YYYY_NARPOut.txt file produced. Not recommended in this version.
200 Q* modelled with L↓ modelled using cloud cover fraction supplied in meteorological forcing file (Loridan et al. 2011 [L2011]). Zenith angle accounted for in albedo calculation. SSss_YYYY_NARPOut.txt file produced. Not recommended in this version.
300 Q* modelled with L↓ modelled using air temperature and relative humidity supplied in meteorological forcing file (Loridan et al. 2011 [L2011]). Zenith angle accounted for in albedo calculation. SSss_YYYY_NARPOut.txt file produced. Not recommended in this version.
EmissionsMethod
Requirement:

Required

Description:

Determines method for QF calculation.

Configuration:
Value Comments
0 Uses values provided in the meteorological forcing file (SSss_YYYY_data_tt.txt). If you do not want to include QF to the calculation of surface energy balance, you should set values in the meteorological forcing file to zero to prevent calculation of QF. UMEP provides two methods to calculate QF LQF which is simpler GQF which is more complete but requires more data inputs
1 Not recommended in this version. Calculated according to Loridan et al. (2011) [L2011] using coefficients specified in SUEWS_AnthropogenicHeat.txt. Modelled values will be used even if QF is provided in the meteorological forcing file.
2 Recommended in this version. Calculated according to Järvi et al. (2011) [J11] using coefficients specified in SUEWS_AnthropogenicHeat.txt and diurnal patterns specified in SUEWS_Profiles.txt. Modelled values will be used even if QF is provided in the meteorological forcing file.
3 Updated Loridan et al. (2011) [L2011] method using daily (not instantaneous) air temperature (HDD(id-1,3)) using coefficients specified in SUEWS_AnthropogenicHeat.txt. Modelled values will be used even if QF is provided in the meteorological forcing file.
StorageHeatMethod
Requirement:

Required

Description:

Determines method for calculating storage heat flux ΔQS.

Configuration:
Value Comments
1 ΔQS modelled using the objective hysteresis model (OHM) [G91OHM] using parameters specified for each surface type.
2 Uses observed values of ΔQS supplied in meteorological forcing file.
3 ΔQS modelled using AnOHM. Not recommended in this version.
4 ΔQS modelled using the Element Surface Temperature Method (ESTM) (Offerle et al. 2005 [OGF2005] ). Not recommended in this version.
OHMIncQF
Requirement:

Required

Description:

Determines whether the storage heat flux calculation uses Q* or ( Q* +QF).

Configuration:
Value Comments
0
ΔQS modelled Q* only.
1
ΔQS modelled using Q*+QF.
StabilityMethod
Requirement:

Required

Description:

Defines which atmospheric stability functions are used.

Configuration:
Value Comments
0 Not used.
1 Not used.
2
• Momentum:
• unstable: Dyer (1974) [D74] modified by Högstrom (1988) [H1988]
• stable: Van Ulden and Holtslag (1985) [VUH85]
• Heat: Dyer (1974) [D74] modified by Högstrom (1988) [H1988]

Not recommended in this version.

3
• Momentum: Campbell and Norman (Eq 7.27, Pg97) [CN1988]
• Heat

Recommended in this version.

4
• Momentum: Businger et al. (1971) [B71] modified by Högstrom (1988) [H1988]
• Heat: Businger et al. (1971) [B71] modified by Högstrom (1988) [H1988]

Not recommended in this version.

RoughLenHeatMethod
Requirement:

Required

Description:

Determines method for calculating roughness length for heat.

Configuration:
Value Comments
1 Uses value of 0.1z0m.
2

Calculated according to Kawai et al. (2009) [Ka09].

Recommended in this version.

3 Calculated according to Voogt and Grimmond (2000) [VG00].
4 Calculated according to Kanda et al. (2007) [Ka07].
RoughLenMomMethod
Requirement:

Required

Description:

Determines how aerodynamic roughness length (z0m) and zero displacement height (zdm) are calculated.

Configuration:
Value Comments
1

Values specified in SUEWS_SiteSelect.txt are used.

Tip

Note that UMEP provides tools to calculate these. See Kent et al. (2017a) [Kent2017a] for recommendations on methods. Kent et al. (2017b) [Kent2017b] have developed a method to include vegetation which is also avaialble within UMEP.

2 z0m and zd are calculated using ‘rule of thumb’ (Grimmond and Oke 1999 [GO99]) using mean building and tree height specified in SUEWS_SiteSelect.txt. z0m and zd are adjusted with time to account for seasonal variation in porosity of deciduous trees.
3 z0m and zd are calculated based on the MacDonald et al. (1998) [Mc98] method using mean building and tree heights, plan area fraction and frontal areal index specified in SUEWS_SiteSelect.txt. z0m and zd are adjusted with time to account for seasonal variation in porosity of deciduous trees.
SMDMethod
Requirement:

Required

Description:

Determines method for calculating soil moisture deficit (SMD).

Configuration:
Value Comments
0 SMD modelled using parameters specified in SUEWS_Soil.txt. Recommended in this version.
1 Observed SM provided in the meteorological forcing file is used. Data are provided as volumetric soil moisture content. Metadata must be provided in SUEWS_Soil.txt. Not available in this version.
2 Observed SM provided in the meteorological forcing file is used. Data are provided as gravimetric soil moisture content. Metadata must be provided in SUEWS_Soil.txt. Not available in this version.
WaterUseMethod
Requirement:

Required

Description:

Defines how external water use is calculated.

Configuration:
Value Comments
0 External water use modelled using parameters specified in SUEWS_Irrigation.txt.
1 Observations of external water use provided in the meteorological forcing file are used.