Terrain bowen ratio (Heat Overlay): Difference between revisions

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{{Overlay attribute
{{terrain attributes
|attribute=BOWEN_RATIO
| <onlyinclude>
|unit=ratio
{{terrain attributes|type=row|group=Heat Overlay
|terraintype=Surface
|attribute=BOWEN_RATIO
|description=Describes the rate of heat transfer for a surface that has moisture as a factor.
|unit=ratio
|icon=
|layer=Surface
|description=Describes the rate of heat transfer for a surface that has moisture as a factor.
|icon=
}} </onlyinclude>}}
 
The Bowen ratio is a property of a surface, specifically the ratio between two types of heat transfer (sensible heat and latent heat). The wetter the surface, the lower the ratio.<ref name="bowen" />
 
{{article end
|notes=
* The {{Heat DPRA Report}} uses only two possible values for the Bowen ratio: 0.4 and 3.0.
* Terrains such as grassland and [[function]]s such as trees and vegetation generally have a ratio of 0.4. Other terrains and functions have a ratio of 3.0.
* Water is special in the sense that during the day the ratio is 0.4 and at night the ratio is 3.0. These values are based on the {{Heat DPRA Report}} and cannot be modified.
|seealso=
* [[Bowen ratio (Heat Overlay)]]
* [[Bowen ratio result type (Heat Overlay)]]
* [[PET formulas (Heat Overlay)]]
|references=
<references>
<ref name="bowen">Wikipedia. Bowen Ratio. https://en.wikipedia.org/wiki/Bowen_ratio. Last visited: 16-12-2019</ref>
</references>
}}
}}


==See also==
{{HeatOverlay model attribute nav}}
* [[Bowen ratio (Heat Overlay)|Bowen ratio]]
 
{{Template:HeatOverlay_model_attribute_nav}}


{{Template:Heat_Module_buttons}}
{{Heat Module buttons}}

Latest revision as of 14:36, 2 October 2020

Icon Attribute Unit Layer Range Description
BOWEN_RATIO ratio Surface Describes the rate of heat transfer for a surface that has moisture as a factor.

The Bowen ratio is a property of a surface, specifically the ratio between two types of heat transfer (sensible heat and latent heat). The wetter the surface, the lower the ratio.[1]

Notes

  • The DPRA Heat stress report uses only two possible values for the Bowen ratio: 0.4 and 3.0.
  • Terrains such as grassland and functions such as trees and vegetation generally have a ratio of 0.4. Other terrains and functions have a ratio of 3.0.
  • Water is special in the sense that during the day the ratio is 0.4 and at night the ratio is 3.0. These values are based on the DPRA Heat stress report and cannot be modified.

See also

References

  1. ↑ Wikipedia. Bowen Ratio. https://en.wikipedia.org/wiki/Bowen_ratio. Last visited: 16-12-2019
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Model attributes
Daily average radiation • Daily average wind speed • Daily maximum temperature • Daily minimum temperature • Dates • Exclude buildings • Exclude water • Exclude foliage height m • Foliage areas • Hourly humidity • Hourly radiation • Hourly temperature • Max shadow distance • Sun altitude • Sun azimuth • Sun daily motion • Wind direction • Wind speed
Building attributes
Bowen ratio • Foliage height • Foliage crown factor • Vegetation fraction
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Calculation models and formulas • Feature attributes • Model attributes • Result types



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