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Boudaghpour, Siamak, Qamari, Ehsan, Bahadori, Amirali. (1405). Modeling the Diffusion and Advection of Pollutants from Flaring in Iran, Considering Seasonal Atmospheric Variability. پژوهشنامه مدیریت اجرایی, (), 1-16. doi: 10.22080/ceas.2026.31549.1091
Siamak Boudaghpour; Ehsan Qamari; Amirali Bahadori. "Modeling the Diffusion and Advection of Pollutants from Flaring in Iran, Considering Seasonal Atmospheric Variability". پژوهشنامه مدیریت اجرایی, , , 1405, 1-16. doi: 10.22080/ceas.2026.31549.1091
Boudaghpour, Siamak, Qamari, Ehsan, Bahadori, Amirali. (1405). 'Modeling the Diffusion and Advection of Pollutants from Flaring in Iran, Considering Seasonal Atmospheric Variability', پژوهشنامه مدیریت اجرایی, (), pp. 1-16. doi: 10.22080/ceas.2026.31549.1091
Boudaghpour, Siamak, Qamari, Ehsan, Bahadori, Amirali. Modeling the Diffusion and Advection of Pollutants from Flaring in Iran, Considering Seasonal Atmospheric Variability. پژوهشنامه مدیریت اجرایی, 1405; (): 1-16. doi: 10.22080/ceas.2026.31549.1091

Modeling the Diffusion and Advection of Pollutants from Flaring in Iran, Considering Seasonal Atmospheric Variability

Civil Engineering and Applied Solutions
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 26 خرداد 1405
نوع مقاله: Original Article
شناسه دیجیتال (DOI): 10.22080/ceas.2026.31549.1091
نویسندگان
Siamak Boudaghpour* 1؛ Ehsan Qamari1؛ Amirali Bahadori2
1Department of Environmental Engineering, Faculty of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran
2Department of Water Resources Management, Faculty of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran
تاریخ دریافت: 26 فروردین 1405،  تاریخ بازنگری: 22 اردیبهشت 1405،  تاریخ پذیرش: 26 خرداد 1405 
چکیده
Gas flaring in oil-producing regions is a significant source of atmospheric pollutants; however, near-field dispersion dynamics governing worker exposure from low-capacity flares under seasonally contrasting atmospheric stability conditions remain insufficiently characterized. This study employed a two-dimensional Eulerian computational fluid dynamics (CFD) framework with RNG k-ε turbulence closure to simulate the dispersion of carbon monoxide (CO), nitrogen oxides (NOx), and sulfur dioxide (SO₂) from a representative low-capacity gas flare at exit velocities of 6–7 m/s and combustion temperatures of 900–1200 K. The computational domain, 2,050 × 286 m, was discretized into 66,000 quadrilateral control volumes. Simulations were conducted for two seasonally representative scenarios: an unstable summer atmosphere (Monin–Obukhov length L = −1148 m) and a stable winter surface-layer inversion (L = +364 m). Model predictions were validated against field measurements at three downwind distances, yielding R² values of 0.997, 0.9996, and 0.969 for CO, NOx, and SO₂, respectively. CO concentrations at breathing height (2 m) exceeded the regulatory ambient standard by 55.0% in summer and 35.0% in winter; SO₂ exceeded the primary ambient standard by 375% and 362.5%, respectively. NOx remained below the flare emission standard at the plume-core level in both seasons. Under unstable summer conditions, buoyancy-driven vertical uplift dominated plume transport; under stable winter conditions, a near-surface recirculation zone between 50 and 400 m downwind generated the widest spatial extent of regulatory exceedance. Atmospheric stability and near-source recirculation are identified as the primary controls on occupational exposure intensity, underscoring the need for targeted flare gas recovery systems and meteorology-aware worker management in Iran's oil-producing regions.
کلیدواژه‌ها
Air pollution؛ Computational fluid dynamics؛ Flaring؛ Advection؛ Diffusion
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