ISSN 1674-0629
CN 44-1643/TK
CN 44-1643/TK
Typhoon Wind Field Observation Method for Overhead Transmission Lines in Coastal Area Using Doppler Lidar
Yanfeng CAI , Zenghao HUANG , Xinqiao WU , Tao CHEN , Xiaobo MENG , Hailong WANG
›› 2020, Vol. 14 ›› Issue (4) : 17 -23.
Typhoon Wind Field Observation Method for Overhead Transmission Lines in Coastal Area Using Doppler Lidar
To study the temporal and spatial characteristics of near-ground wind field during typhoon period and accumulate the field wind speed data around the coastal transmission line tower during typhoon,a domestic 3D scanning Doppler lidar is deployed in an in situ wind field observation campaign during the landing of No. 1604 Typhoon "Nida". Data from Doppler beam swing and plain position indicator scan modes are retrieved and analyzed,verifying the capabilities of the observation method based on Doppler lidar. The results indicate that the eye zone of typhoon "Nida" shows a typical "U" shape in air pressure while its eyewall zone presents a relatively typical "double peak type" shape in wind speed. The variation of wind speed,wind direction and gust coefficient with height is obvious between the strong wind area of eyewall zone and the eye zone of typhoon. Wind speed profile above 300 m height obviously deviates from the form of exponential law or logarithmic law profile. Wind direction deflects at a certain degree to the right side under the influence of geostrophic effect from near surface to upper air,and gust coefficient decrease with the increase of height and mean wind speed. The influence of terrain on local wind field can be distinguished in radar radial wind velocity distribution map of low elevation horizontal azimuth scanning,and the wind speed around transmission towers under different terrain is obviously different.
Doppler lidar / overhead transmission line / typhoon
Science and Technology Project of Electric Power Reserch Institute,CSG(ZBKJXM20170046)
National Key Research and Development Program of China(2018YFB1501104)
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