Campbell Q-7.1 Instrukcja Operatora Pobierz pdf (Strona 56)

Installation, Operation and Maintainance of Buoy Operated Automatic Meteorological Stations

Annex 7: Wind Vector

Wind speed and direction are measured with a polar sensor (R. M. YOUNG 05103). The raw data are processed to

a wind vector, which includes:

a. Mean horizontal wind speed, S [m/s]

b. Unit vector wind direction, 1 [degrees]

c. Standard deviation of wind direction, (1) [degrees]

Mean horizontal wind speed is calculated using:

S = (S

)/N

In which the indices i denotes each individual sample.

Unit vector wind direction is calculated using:

1 = Arctan (Ux/Uy)

where:

Ux = (sin

)/N

Uy = (cos

)/N

Standard deviation of wind direction is calculated using (Yamartino algorithm):

(1) = arc sin()[1 + 0.1547 

]

where:

 = [1-((Ux)

+ (Uy)

)]

Ux and Uy are calculated as above.

Reference: Campbell Scientific CR10X Operator’s Manual

Annexes

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Campbell Q-7.1 Instrukcja Operatora Strona 56