Wind environment (2)

[14] STUDY OF DIFFERNECE OF AVERAGE WIND SPEED BETWEEN 3 CUP ANEMOMETER AND ULTRASONIC ANEMOMETER FOR WIND ENVIRONMENT ASSESMENT

○Akinori Akahoshi¹, Kenichi Shimose², Takeshi Kishida³, Yasushi Uematsu⁴, Ryuichiro Yoshie⁵ (1.Wind Engineering Institute Co.,Ltd. , 2.National Research Institute for Earth Science and Disaster Resilience, 3.Central Research Institute of Electric Power Industry, 4.Tohoku University School of Engineering, 5.Tokyo Polytechnic University)

Keywords:wind environment assessment, ultrasonic anemometer, 3 cup anemometer

The criterion for wind environment assessment by WEI is based on the relation between the mean wind speeds measured by 3 cup anemometers and the peripheral situation. Recentry, the urbanization of cities has progressed, resulting in a significant change in public opinion concerning the wind environment. In addition, ultrasonic anemometers with lower cost and higher performance has become popular and taken place of 3 cup anemometers; 3-cup anemometers respond to the wind speed change slowly for lower wind speeds while they tend to over-rotate for higher wind speeds. Furthermore, wind observation method has been changed following the specification of WMO. Considering these circumstances, we discuss a new criterion for the wind environment assessment. The present paper investigates the difference between 3 cup anemometer and ultrasonic anemometer for the measured values of wind speeds, and correction method for converting the measured values by 3 cup anemometers to ultrasonic anemometers.