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Updated: Jul 25, 2025
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Measurement of Greenhouse Gas Flux from Agricultural Soils Using Static Chambers
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Accounting for Area Sources in Air Pollution Models
Akula Venkatram1, Ranga Rajan Thiruvenkatachari1
1Department of Mechanical Engineering, University of California, Riverside, CA 92521, USA.
Summary
This study proposes a novel method for modeling air pollution dispersion from complex area sources. The approach accurately estimates emissions, even from irregularly shaped sources like dairy manure lagoons.
Area of Science:
- Atmospheric science
- Environmental modeling
- Air pollution dispersion
Background:
- Area sources are crucial for air pollution models, but existing methods struggle with arbitrary shapes and efficiency.
- Lack of consensus on a universally applicable and numerically efficient dispersion modeling approach for area sources.
Purpose of the Study:
- To propose and describe a novel, efficient, and versatile approach for modeling dispersion from arbitrarily shaped area sources.
- To fill the gap in the open literature regarding the detailed methodology and application of this dispersion modeling technique.
Main Methods:
- Representing area sources as a series of perpendicular line sources, with the number of lines determined by desired concentration precision.
- Applying the method to model methane emissions from dairy manure lagoons using inverse modeling.
Main Results:
- Demonstrated that area source shape significantly impacts downwind concentration patterns, even with identical emissions and density.
- Successfully utilized the proposed method for inverse modeling to estimate methane emissions from a dairy farm.
Conclusions:
- The proposed line source representation method offers an efficient and accurate solution for modeling dispersion from complex area sources.
- This approach provides a valuable tool for environmental management and emission estimation, particularly for agricultural sources.
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