《Table 1–Characteristics of odour source assumed for dispersion calculations.》

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《Assessing the inter-annual variability of separation distances around odour sources to protect the residents from odour annoyance》

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Among the sources of uncertainty in dispersion modelling，algorithms that deal with the source typology are prominent.According to Pullen and Vawda（2007），predicted concentrations are fundamentally more accurate for single stacks，first hand.So，we chose a single point source for the investigation.The odour emission rate is constant，continuous，and stationary in time，with an annual mean value of 17，500 ouE/sec.A variety of emission factors can be found in the German guideline VDI 3894 Part 1（2011）to translate this odour emission rate into a typical livestock building.The geometry of the source is presumed circular，with a height of 6 m from the ground，inner diameter of 1.2 m，and vertical release.The exit velocity is 3.0 m/s，and the gas temperature is 35°C.This source configuration attempts to replicate the emission from a typical mechanically ventilated livestock building.Table 1summarises the odour source parameters assumed for the dispersion calculations.