Bowen ratio (Heat Overlay)

Icon	Attribute	Unit	Range	Description
	BOWEN_RATIO	ratio		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.

Notes

• The DPRA Heat stress report uses only two possible values for the Bowen ratio: 0.4 and 3.0.
• By default, Functions such as trees and vegetation generally have a ratio of 0.4. Other functions have a ratio of 3.0.
• The value must be in the range of 0.001 to 10.

See also

• Terrain bowen ratio (Heat Overlay)
• Bowen ratio result type (Heat Overlay)
• PET formulas (Heat Overlay)

References

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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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Building elevation • Foliage height • Terrain elevation

Related

Calculation models and formulas • Feature attributes • Model attributes • Result types