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Arrhenius Bridge & UHI multipliers
SYS
This is the temperature term in the ATH degradation model. The Arrhenius equation describes how reaction (and biological growth) rates accelerate with temperature; the 'Arrhenius bridge' applies it to colonisation and material-degradation kinetics so that warmer surfaces fail faster. The Urban Heat Island (UHI) multiplier scales this for the built environment: cities and dense fabric retain heat, raising local surface temperatures and lengthening the effective growth season, and — within AEBEM — UHI plumes act as transport highways for spores and pollution. Combined with Time of Wetness, the Arrhenius/UHI factor converts microclimate into a degradation-timescale input for the COSMOS Time-to-Failure engine.
rate-constant acceleration, time of wetness
This is the temperature term in the ATH degradation model. The Arrhenius equation describes how reaction (and biological growth) rates accelerate with temperature; the 'Arrhenius bridge' applies it to colonisation and material-degradation kinetics so that warmer surfaces fail faster. The Urban Heat Island (UHI) multiplier scales this for the built environment: cities and dense fabric retain heat, raising local surface temperatures and lengthening the effective growth season, and — within AEBEM — UHI plumes act as transport highways for spores and pollution. Combined with Time of Wetness, the Arrhenius/UHI factor converts microclimate into a degradation-timescale input for the COSMOS Time-to-Failure engine.
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