Wind Variable Summary definition

Wind Variable Summary of the parameters in Table 4 are one to five percentile worst-case, except wind direction (median). Since wind speed is for more than 10 % of the time during January the lower of model accuracy (1 was used. Table 4 Summary of Site-Specific Wiid Conditions for analyses Time of Day clock) Wiid Speed Wind Direction Miig Height (meters) Variabilitv 1 :oo 320 20 25 degrees 13:oo 235 160 25 degrees * A minimum wind speed of 1 meter/second is assigned due. to dispersion model limit The temperature data employed the analyses are the climatological data for “mean coldest January day” for Atlanta, GA scaled to the mean diurnal temperature profile recorded at the Tucker PAMS site and rounded to the nearest degree. Relative humidity data are the percentile for non-saturated (fog) conditions for the Tucker, GA PAMS site 1992-1997. Table es the appropriate ambient temperatures used and modeling. Time of Day Temperature Relative Dispersion Height Mixing heights were estimated from Southern Study data, scaled During studies in August-September 1991, July-August 1992, September 1995 and July-August 1996 approximately 65 complete tethersonde of temperature and dew point were recorded on the Georgia Tech campus approximately 3 km south of the site. Based on these mean boundary layer breakup time was estimated to be two hours after sunrise am in January) with 80% of boundary layer height achieved 3.5 hours (- 10 am January). The data periods used to evaluate each time given in Table 6 below. Because the primary data sources occur in July-September and the evaluation period is for January, seasonal adjustment is required. Adjustments are made to the 7:00 samples based on the ratio of the mean mixing height for February and May a rural site central Georgia (▇▇▇▇▇▇▇▇▇▇, 1997) collected by the same tethersonde equipment. Since these measurements were made only during the evening and early morning, no corrections are applied to the daytime values. While this may represent some over-estimate height during this period, it has little practical significance due to the much lower mixing height predicted for the early morning period. These nocturnal and early morning mixing heights (20 and 22 meters) are in generally good agreement, however, with early estimates by ▇▇▇▇▇▇▇ (1986) of between 16 and 30 meters for December conditions near the same site.
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