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Page Title:
Effective downwind fallout speed |
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EFFECTIVE DOWNWIND FALLOUT SPEED. The effective downwind fallout (EDF) speed is determined using the following steps: 1. Measure the length of the radial line from GZ to the cloud-bottom (CB) point. 2. Convert the length into kilometers, using the map scale on which the wind vector plot is drawn.3. Compute EDF speed by using the follow-ing formula:
Example: The distance between GZ and CB equals 26.0 centimeters. This distance equals 67 kilometers when using a map with a scale of 1:250,000 (1 kilometer = 4 millimeters). The time
Figure 6-9-6.-Wind vector plot with expanded radial lines. of fall from the cloud base associated with a 50-kt explosion is 2,35 hours. Then,
The effective down wind direction and effective fallout speed are used to determine the zones of hazardous fallout. |
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