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Short-term landfill methane emissions dependency on wind.

Madjid Delkash1, Bowen Zhou2, Byunghyun Han1

  • 1Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, United States.

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Summary

Short-term methane emissions from landfills can vary due to wind speed. This study found that landfill methane emissions increase with wind speed, potentially impacting measurement accuracy using the tracer dilution method.

Keywords:
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Area of Science:

  • Environmental Science
  • Atmospheric Science
  • Geochemistry

Background:

  • Short-term variations in whole-landfill methane emissions have been documented.
  • The tracer dilution method is commonly used for emissions measurement.
  • Understanding these variations is crucial for accurate environmental monitoring.

Purpose of the Study:

  • To investigate the causes of short-term variations in landfill methane emissions.
  • To evaluate the impact of atmospheric conditions on emissions measurements.
  • To assess the reliability of the tracer dilution method under varying conditions.

Main Methods:

  • Applied the tracer dilution method with 1-minute emissions measurements over a 2-hour period at Sandtown Landfill.
  • Developed and utilized an atmospheric dispersion model for the field test site.
  • Examined temporal and spatial variability of wind speed and tracer gas/methane locations.

Main Results:

  • Atmospheric modeling indicated that wind speed variations can cause fluctuations in tracer dilution method measurements.
  • Field data showed a correlation between methane emissions and surface wind speed (R²=0.51-0.55).
  • Methane emissions increased up to twofold with a 30% increase in wind speed.

Conclusions:

  • Wind-induced variations in whole-landfill emissions may affect tracer dilution method measurements.
  • The findings suggest potential impacts on emissions measurements at other landfills.
  • Further research is needed to fully understand and mitigate wind effects on landfill emissions monitoring.