OHM coefficients · SUEWS parameter database

browse · records/ohm/vancouver--meyn2009--buildings--commercial-industrial-bitumen-mixed-wetness-code-705.yml

OHM coefficients — Commercial/industrial bitumen roof, mixed wetness, wind 1.1-2.0 m s-1 [705] evidence record

a10.06

a20.28

a3-3

ohm vancouver site Facet or component Meyn 2009

Parameters

Names follow the SUEWS YAML specification; click one for its definition in the configuration reference.

`a1`	0.06
`a2`	0.28
`a3`	-3

Provenance evidence

Awaiting sign-off

Fitted · assessed by provenance-audit · 2026-08-26. Agent assessment is evidence preparation, not human verification.

Heat fluxes through roofs and their relevance to estimates of urban heat storageParameter source

Where: Table 4, measured commercial/industrial bitumen roof — mixed wetness, wind 1.1-2.0 m s-1, p. 750

Four days of measurements on the UBC Music building; 0.06, 0.28 h, -3 W m-2.

Heat fluxes through roofs and their relevance to estimates of urban heat storageInput observations

Where: Table 2, roof study sites and assemblies, p. 747

Roof (own for SMEAR III, Helsinki) [750]Related record

Uses code 705 with six other Meyn rows and code 713 in its documented arithmetic mean.

Assessment findings

Name	supported Table 4 identifies a commercial or industrial bitumen roof under mixed wetness with wind 1.1-2.0 m s-1; code 705 is retained legacy identity.
Target	supported The source reports objective-hysteresis coefficients for roof heat storage.
Values	supported Table 4 states a1 0.06, a2 0.28 h and a3 -3 W m-2 exactly.
Source	supported Meyn and Oke directly publish the complete fitted tuple.
Place	supported The measured roof site is on the University of British Columbia campus in Vancouver.
Representativeness	supported The coefficients are derived from one monitored roof, supporting site scope.
Applicable Scale	supported Meyn and Oke fit each tuple to a specific monitored commercial/industrial or residential roof under the stated surface and weather condition, establishing roof-facet scale. issue #46
Method	supported The table reports averages of regression coefficients fitted to hourly measured Q-star and roof conductive heat flux.
Identity	supported The material, wetness, wind class and exact tuple identify one Table 4 row; the related Helsinki record uses it as an arithmetic-mean input.

Scientific note

The record is a direct, source-coherent transcription of one Table 4 regression row derived from measured fluxes. No canonical field changes.

Model-ready fragment

Paste under ohm_coefficients in a SUEWS YAML configuration; every value carries its citation.

a1:
  value: 0.06
  ref:
    ID: meyn2009
    DOI: 10.1016/j.enbuild.2009.02.005
    desc: vancouver, site, facet
a2:
  value: 0.28
  ref:
    ID: meyn2009
    DOI: 10.1016/j.enbuild.2009.02.005
    desc: vancouver, site, facet
a3:
  value: -3
  ref:
    ID: meyn2009
    DOI: 10.1016/j.enbuild.2009.02.005
    desc: vancouver, site, facet

Evidence review

Awaiting sign-offSign off evidence on GitHub

Raises a prefilled sign-off issue. CI accepts it only when the issue author is in the verifier registry and the evidence revision is still current.

Review procedure

Record metadata

SourceMeyn, Stephanie K.; Oke, T. R. (2009) · doi:10.1016/j.enbuild.2009.02.005

Placevancouver

Scopesite

Applicable scaleFacet or component

Targetohm_coefficients · docs

Origin“Vancouver” (verbatim legacy string)

Schema2026.5

Same study, same place

Commercial/industrial gravel roof, dry, wind 1.0-1.4 m s-1 [702] ohm vancouver
Commercial/industrial gravel roof, dry, wind 1.5-2.0 m s-1 [703] ohm vancouver
Commercial/industrial gravel roof, dry, wind below 1 m s-1 [701] ohm vancouver
Commercial/industrial gravel roof, wet, wind 0.9-1.9 m s-1 [704] ohm vancouver
Residential asphalt-shingle roof, dry, wind 1.0-1.4 m s-1 [707] ohm vancouver
Residential asphalt-shingle roof, dry, wind below 1 m s-1 [706] ohm vancouver

all 7 sets from meyn2009 at vancouver →

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