 |
||
|
|
||
|
Page Title:
Sound Focus Wind-Speed Component Worksheet |
||
| |||||||||||||||
|
|
Sound Focus Wind-Speed Component Worksheet An abbreviated version of a sound focus wind-speed worksheet is shown in figure 6-5-2. The information entered on the worksheet is as follows: DATE/TIMEEnter the date and time of the sounding you are using. POINT OF INTERESTEnter the geographic location of the point of concern.POINT OF BLASTEnter the geographical location where the blast or detonation is going to take place.AZIMUTH OF INTERESTEnter the true bearing, in whole degrees, from the point of blast to the point of interest.COLUMN (1), PPPEnter the pressure at each selected level. Include all levels, mandatory and significant, up to and including the 850-mb level.COLUMN (2), TTTEnter the temperature at each selected level, in degrees and tenths.COLUMN (3), DDDEnter the true wind direction at each selected level.COLUMN (4), FFFEnter the wind speed at each selected level.COLUMN (5), DDD MINUS (A1 + 180) Use this formula to calculate the entry for column (5). A1 is the azimuth of interest. For example, if the true wind equals 150 degrees and the azimuth of interest is 160 degrees, using the formula DDD (A1 + 180), we would find 150 (160 + 180) or 150 340; finally reducing the entry for column (5) to 190. The negative sign is important. It means the wind will retard the speed of sound.COLUMN (6), COS(5)Enter the cosine values for each of the column (5) entries. The worksheet contains the cosine values at 5-degree increments. See figure 6-5-2.COLUMN (7), (4) x (6)Multiply the entry in column 4 by the entry in column 6 for each level.Three things can be determined from the information on the worksheet: (1) the sound-velocity gradient through the 5,000-foot layer, (2) whether or not a blast will occur, and (3) the blast wave intensity at a point of interest. |
|
Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing |