Influence of Modelling Approaches of Diffusion Coefficients on Atmospheric Dispersion Factors

Hwang, Won Tae; Kim, Eun Han; Jeong, Hae Sun; Jeong, Ho-Seung; Han, Moon Hee

doi:10.14407/jrp.2013.38.2.060

Cited by 1 publication

(2 citation statements)

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“…[ 34 , 35 ]. Moreover, temperature, wind speed, humidity, and atmospheric stability interact with each other in actual atmospheric dispersion [ 36 , 37 ]. However, in this study, these interactions were not considered when analyzing the independent sensitivity of OCA tools to common weather variables.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, sensitivity was found to decrease in the following order: 35% HCl, 50% HF, and 69% HNO 3 . Assuming that emissions per hour and evaporation remain constant, along with temperature, wind speed, and humidity, specific gravity is a physicochemical factor that affects the diffusion of chemicals [ 37 , 44 , 45 ]. The specific gravity of 28% NH 3 is lower than one, and is lower than that of 35% HCl, 50% HF, and 69% HNO 3 .…”

Section: Discussionmentioning

confidence: 99%

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Sensitivity Analysis of Weather Variables on Offsite Consequence Analysis Tools in South Korea and the United States

Kim

Moon

Sohn

et al. 2018

IJERPH

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We studied sensitive weather variables for consequence analysis, in the case of chemical leaks on the user side of offsite consequence analysis (OCA) tools. We used OCA tools Korea Offsite Risk Assessment (KORA) and Areal Location of Hazardous Atmospheres (ALOHA) in South Korea and the United States, respectively. The chemicals used for this analysis were 28% ammonia (NH3), 35% hydrogen chloride (HCl), 50% hydrofluoric acid (HF), and 69% nitric acid (HNO3). The accident scenarios were based on leakage accidents in storage tanks. The weather variables were air temperature, wind speed, humidity, and atmospheric stability. Sensitivity analysis was performed using the Statistical Package for the Social Sciences (SPSS) program for dummy regression analysis. Sensitivity analysis showed that impact distance was not sensitive to humidity. Impact distance was most sensitive to atmospheric stability, and was also more sensitive to air temperature than wind speed, according to both the KORA and ALOHA tools. Moreover, the weather variables were more sensitive in rural conditions than in urban conditions, with the ALOHA tool being more influenced by weather variables than the KORA tool. Therefore, if using the ALOHA tool instead of the KORA tool in rural conditions, users should be careful not to cause any differences in impact distance due to input errors of weather variables, with the most sensitive one being atmospheric stability.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%