Part 2 - Eskom

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ENVIRONMENTAL SCOPING REPORT FOR THE PROPOSED 40MW OPEN CYCLE GAS TURBINE POWER PLANT IN THE AMERSFOORT AREA, MPUMALANGA Bohlweki-SSI Environmental Figure 7.5: Frequency distribution derived from monitored data (UCG Pilot Plant: 2006 to 2007) Figure 7.6: Period wind rose derived from modeled data sourced from the South African Weather Services (2006 to 2007) E02.JNB.000308 ESKOM HOLDINGS LIMITED 01 42 08/10/2009
ENVIRONMENTAL SCOPING REPORT FOR THE PROPOSED 40MW OPEN CYCLE GAS TURBINE POWER PLANT IN THE AMERSFOORT AREA, MPUMALANGA Bohlweki-SSI Environmental Figure 7.7: Frequency distribution derived from modelled data (South African Weather Services: 2006 to 2007) The average wind speed for the Amersfoort area is 3.24 m/s, with the highest recorded wind speeds (between 8 and 11 m/s) coming from the west. Of the annual modelled hourly data from the weather services, approximately 1.79% of that hourly data is recorded as calm winds, representing periods of little dispersion. Information pertaining to calm periods, average wind speeds and wind direction all play a significant role with regards to dispersion effects and will play a fundamental role during the modelling undertaken in the EIA phase of the project. 7.1.3.1. Atmospheric Stability Atmospheric stability is commonly categorised into one of six stability classes. These are briefly described in Table 7.1. The atmospheric boundary layer is usually unstable during the day due to turbulence caused by the sun's heating effect on the earth's surface. The depth of this mixing layer depends mainly on the amount of solar radiation, increasing in size gradually from sunrise to reach a maximum at about 5-6 hours after sunrise. The degree of thermal turbulence is increased on clear warm days with light winds. During the night a stable layer, with limited vertical mixing, exists. During windy and/or cloudy conditions, the atmosphere is normally neutral. E02.JNB.000308 ESKOM HOLDINGS LIMITED 01 43 08/10/2009
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