Campbell Scientific CR6 CR6 Measurement and Control System - Page 298
Wind Vector
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Section 7. Installation Under the Settings Editor tab, Advanced sub-tab, to the following: • Load a certificate • Set TLS Private Key • Set TLS Clients > 0 • Set TLS Server Connections > 0 7.9.21 Wind Vector The WindVector() instruction processes wind-speed and direction measurements to calculate mean speed, mean vector magnitude, and mean vector direction over a data-storage interval. Measurements from polar (wind speed and direction) or orthogonal (fixed East and North propellers) sensors are supported. Vector direction and standard deviation of vector direction can be calculated weighted or unweighted for wind speed. 7.9.21.1 OutputOpt Parameters In the CR6 WindVector() instruction, the OutputOpt parameter defines the processed data that are stored. All output options result in an array of values, the elements of which have _WVc(n) as a suffix, where n is the element number. The array uses the name of the Speed/East variable as its base. table OutputOpt Options (p. 298) lists and describes OutputOpt options. Table 60. OutputOpt Options Option Description (WVc() is the Output Array) WVc(1): Mean horizontal wind speed (S) WVc(2): Unit vector mean wind direction (Θ1) 0 WVc(3): Standard deviation of wind direction σ(Θ1). Standard deviation is calculated using the Yamartino algorithm. This option complies with EPA guidelines for use with straight-line Gaussian dispersion models to model plume transport. WVc(1): Mean horizontal wind speed (S) 1 WVc(2): Unit vector mean wind direction (Θ1) WVc(1): Mean horizontal wind speed (S) WVc(2): Resultant mean horizontal wind speed (U) WVc(3): Resultant mean wind direction (Θu) 2 WVc(4): Standard deviation of wind direction σ(Θu). This standard deviation is calculated using Campbell Scientific's wind speed weighted algorithm. Use of the resultant mean horizontal wind direction is not recommended for straight-line Gaussian dispersion models, but may be used to model transport direction in a variable-trajectory model. 3 WVc(1): Unit vector mean wind direction (Θ1) WVc(1): Unit vector mean wind direction (Θ1) WVc(2): Standard deviation of wind direction σ(Θu). This standard deviation is 4 calculated using Campbell Scientific's wind speed weighted algorithm. Use of the resultant mean horizontal wind direction is not recommended for straight-line Gaussian dispersion models, but may be used to model transport direction in a variable-trajectory model. 298