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3.1.4. Options related to disaggregation of input data#
- DisaggMethod#
- Requirement:
Optional
- Description:
Specifies how meteorological variables in the input file (except rain and snow) are disaggregated to the model time step. Wind direction is not currently downscaled so non -999 values will cause an error.
- Configuration:
Value
Comments
1
Linear downscaling of averages for all variables, additional zenith check is used for Kdown. This is the default option.
2
Linear downscaling of instantaneous values for all variables, additional zenith check is used for Kdown.
3
WFDEI setting: average Kdown (with additional zenith check); instantaneous for Tair, RH, pres and U. (N.B. WFDEI actually provides Q not RH)
- KdownZen#
- Requirement:
Optional
- Description:
Can be used to switch off zenith checking in Kdown disaggregation. Note that the zenith calculation requires location information obtained from SUEWS_SiteSelect.txt. If a single met file is used for all grids, the zenith is calculated for the first grid and the disaggregated data is then applied for all grids.
- Configuration:
Value
Comments
0
No zenith angle check is applied.
1
Disaggregated Kdown is set to zero when zenith angle exceeds 90 degrees (i.e. sun below horizon) and redistributed over the day. This is the default option.
- RainDisaggMethod#
- Requirement:
Optional
- Description:
Specifies how rain in the meteorological forcing file are disaggregated to the model time step. If present in the original met forcing file, snow is currently disaggregated in the same way as rainfall.
- Configuration:
Value
Comments
100
Rainfall is evenly distributed among all subintervals in a rainy interval. This is the default option.
101
Rainfall is evenly distributed among among RainAmongN subintervals in a rainy interval – also requires RainAmongN to be set.
102
Rainfall is evenly distributed among among RainAmongN subintervals in a rainy interval for different intensity bins – also requires MultRainAmongN and MultRainAmongNUpperI to be set.
- RainAmongN#
- Requirement:
Optional
- Description:
Specifies the number of subintervals (of length tt) over which to distribute rainfall in each interval (of length TT).
- Configuration:
Must be an integer value. Use with RainDisaggMethod = 101.
- MultRainAmongN#
- Requirement:
Optional
- Description:
Specifies the number of subintervals (of length tt) over which to distribute rainfall in each interval (of length TT) for up to 5 intensity bins. Must take integer values.
- Configuration:
Use with RainDisaggMethod = 102. e.g. MultRainAmongN(1) = 5, MultRainAmongN(2) = 8, MultRainAmongN(3) = 12
- MultRainAmongNUpperI#
- Requirement:
Optional
- Description:
Specifies upper limit for each intensity bin to apply MultRainAmongN.
- Configuration:
Any intensities above the highest specified intensity will use the last MultRainAmongN value and write a warning to Warning messages: warnings.txt. Use with RainDisaggMethod = 102. e.g. MultRainAmongNUpperI(1) = 0.5, MultRainAmongNUpperI(2) = 2.0, MultRainAmongNUpperI(3) = 50.0
- DisaggMethodESTM#
- Requirement:
Optional
- Description:
Specifies how ESTM-related temperatures in the input file are disaggregated to the model time step.
- Configuration:
Value
Comments
1
Linear downscaling of averages.
2
Linear downscaling of instantaneous values.