Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...

Table 3-19. Calculated Methane Flux and Prevailing Wind Speed and Direction
Measured on February 24 along the Western VRPM Configuration in the
Control Cell of Site #2
Time
Methane Flux
(g/s)
Prevailing Wind Direction
(degrees from North)
Prevailing Wind Speed
(m/s)
15:08:07 2.7 136 5.1
15:15:07 3.5 127 5.9
15:21:38 2.7 143 6.6
15:28:36 2.7 149 7.3
15:35:51 2.5 153 7.9
15:42:38 2.2 154 7
15:49:36 2.4 150 6.9
15:57:01 2.7 144 6.6
16:03:38 2.3 147 6.3
16:10:06 2.1 148 6.3
16:17:11 2.5 143 5.8
16:23:44 3.2 143 7.2
16:30:38 3.4 141 6.9
16:37:36 3.2 138 6.2
16:44:55 3.2 135 5.9
16:51:38 3.3 130 5.5
16:58:36 3.4 131 6.3
3.2.1.2 February 25
Average= 2.8
Standard Dev.=0.46
ORS measurements were collected in the control cell during the morning and early afternoon of
February 25. The ORS measurement configuration used on February 25 was identical to the
configuration used on February 24 (see Figure 2-4). Figure 3-5 presents a summary of the actual
measurement configurations used in the cell, as well as the measurement results. The figure
depicts the average calculated methane flux values along each VRPM measurement plane. The
blue arrow depicts the prevailing wind values during the time of the measurements.
The figure shows that the prevailing winds were from the southwest during the time of the
measurements. Based on the prevailing wind direction, the southern and western VRPM planes
are located upwind of the actual landfill cell, so flux values measured along these VRPM planes
represent methane emissions from the southern and western slopes of the cell (by convention of
the measurement method, flux values from measurement planes located upwind of the landfill
cell are shown as negative values). The VRPM planes located along the northern and eastern
boundaries of the cell are downwind of the landfill cell (by convention, flux values from
measurement planes located downwind of the landfill cell are shown as positive values).
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