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However, reductions are typically lower than for coarser particles (e.g., 40–70%), as
some fine dust can still advect over/around the fence in high winds or suboptimal
configurations.
Overall emission reductions at the terminal boundary often reach 50–80% for well-optimized fences, with
emission rate at source (by lowering shear stress on pile surfaces) and the percentage of emitted
particles that escape the site. For instance, configurations with taller fences (e.g., exceeding pile height)
and moderate porosity show the best balance, minimizing both generation (via lower u*) and escape (via
interception).
in a modeled 15 mph wind scenario. Lower percentages = better dust containment. The configurations
tested are no fence, ½-wrap, ¾-wrap, and full-wrap fences at 80 ft and 100 ft heights, for three wind
directions (SW, SSE, WNW). On the next page the data can be seen formatted for better comparison of
the results.
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