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Produce urban climate models indicators #1021

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j3r3m1 opened this issue Jan 16, 2025 · 7 comments
Open

Produce urban climate models indicators #1021

j3r3m1 opened this issue Jan 16, 2025 · 7 comments
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enhancement New feature or request

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@j3r3m1
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j3r3m1 commented Jan 16, 2025

We need to verify that GeoClimate has the possibility to create the spatial informations needed for urban climate models such as:

  • Urban Weather Generator (UWG)
  • Vertical City Weather Generator (VCWG)
  • Surface Urban Energy and Water Balance Scheme (SUEWS)

@CsillaVG could you list the spatial informations needed for each of these models ?

@j3r3m1 j3r3m1 added the enhancement New feature or request label Jan 16, 2025
@ebocher
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ebocher commented Jan 16, 2025

Plus the Target ( The Air-temperature Response to Green/blue-infrastructure Evaluation Tool).

@j3r3m1
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j3r3m1 commented Jan 16, 2025

Yes but we already have this list since it has been calculated isn't it ?

@CsillaVG
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Absolutely! I am still at AMS, but expect it till or on Monday.
I can look into how we stand with regards of Target over the coming weeks.

@CsillaVG
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SURFACE FRACTIONS ::

SUEWS distinguishes seven surface categories: Paved, Buildings, EvergreenTrees, DecidiousTrees, Grass, Baresoil and Water. UMEP can calculate the fraction of these for selected areas.

UWG distinguishes only four surface types: bldDensity, treeCover, grasscover and paved. The fraction of these should add up to one, but only the first three of these can be directly input by the user. Thus, the sum of bldDensity, treeCover, grasscover should be less than 1. Given that UMEP distinguishes seven surface types, the extra categories need to be reclassified and the fractions recalculated.

VCWG distinguishes three surface types: soil (fbare_G), paved (fimp_G) and vegetated (fveg_G)*. These three categories should add up to one. Similarly to UWG, the extra surface categories distinguished by UMEP need to be reclassified and the fractions recalculated.

  • AFAIK, buildings are not included in the paved/impervious category (building coverage is controlled by other means...).

to be continued.

@CsillaVG
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3D or TURBULENCE-RELATED PARAMETERS ::

SUEWS
mandatory : building and tree heights (H_Bldgs, H_DecTr, H_EveTr)
optional : roughness length for momentum (z0), zero-plane displacement (zd), area index for buildings, evergreen and deciduous trees (FAI_Bldgs, FAI_DecTr, FAI_EveTr)
not yet in use : area of wall within grid (AreaWall)

Most of these are calculated by UMEP.

UWG

  • mean building height (bldHeight)
  • vertical-to-horizontal urban area ratio (verToHor or wai in UMEP)

These are calculated by UMEP.

VCWG

  • mean building height (Height_canyon)
  • mean canyon width (Width_canyon)
  • mean building depth (Width_roof)

The tree related spatial parameters (tree height, canopy radius and distance between trees) are a function of the canyon size. In this sense, they do not represent real life cases and/or values.

OTHER ::
SUEWS - population density, day and/or night [ppl/ha]

@CsillaVG
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CsillaVG commented Jan 23, 2025

SUEWS's SPARTACUS module has a few additional 3D related parameters. The parameter list and their explanation is coming shortly.

@CsillaVG
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Notes to VCWG's handling of surface areas. As noted earlier, the building area fraction (or planar area density) is set both separately from other surface fractions and indirectly via the Width_canyon and Width_roof parameters. The two controls the grid layout of the free-standing cube model of a city. There are however limits set in the model for the ratio of these two parameters: 0.3 < Width_roof/Geometry_m < 3. This effectively sets the VCWG-modelable building area fraction within the 0.06 and 0.56 range.

The above and additional limits set in the model also influences the range of achievable tree area fraction. While the lower limit is 0, the upper limit is the theoretical 0.44. This, however, is not obtainable with real-world/conventional building typologies, because the canyon height also limits the radius of the tree. Put simply, a rural/sub-urban area with low-rise, low-density buildings (low building faction), but with abundance of vegetation (high tree area fraction) cannot be defined. In the medium to high building area fraction range: 0.25-0.56 the achievable maximum tree area density is 0.20-0.05, respectively.

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