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Observation of Typhoon Hato based on the 356-m high meteorological gradient tower at Shenzhen
Abstract Field measurements of tropical cyclone (TC) at coastal areas are of great significance for the prevention and control of TC disasters. Despite the increasing efforts on this topic in the last years, studies based on fast-response records of TC wind at multiple heights over land are still limited. To this end, a 365 m high meteorological observation gradient tower at Shenzhen has been constructed and put into use since 2016. It is currently the tallest mast tower in Asia and the second tallest of this kind in the world. There are 13 levels of instruments installed in a range of 10 m–350 m on the mast, to measure various weather elements at a sampling frequency utmost to 10 Hz. This paper presents an observational study on the wind characteristics of Typhoon Hato which made landfall with an intensity of severe typhoon at a distance of ~90 km from the tower on Aug. 23, 2017. The vertical profiles of mean wind speed and typical wind turbulence quantities, i.e., gust factor, turbulence intensity, integral length scale, etc., are demonstrated and compared against provisions stipulated in wind load codes. The effects of thermal stratification on these quantities are stressed.
Highlights Investigated typhoon wind over a built-up terrain based on a 356-m gradient tower. Examined thermal/in-homogenous effects on characteristics of wind quantities. Comparison of observations and provisions in wind load codes. Both upward and downward wind components were observed during TC passage.
Observation of Typhoon Hato based on the 356-m high meteorological gradient tower at Shenzhen
Abstract Field measurements of tropical cyclone (TC) at coastal areas are of great significance for the prevention and control of TC disasters. Despite the increasing efforts on this topic in the last years, studies based on fast-response records of TC wind at multiple heights over land are still limited. To this end, a 365 m high meteorological observation gradient tower at Shenzhen has been constructed and put into use since 2016. It is currently the tallest mast tower in Asia and the second tallest of this kind in the world. There are 13 levels of instruments installed in a range of 10 m–350 m on the mast, to measure various weather elements at a sampling frequency utmost to 10 Hz. This paper presents an observational study on the wind characteristics of Typhoon Hato which made landfall with an intensity of severe typhoon at a distance of ~90 km from the tower on Aug. 23, 2017. The vertical profiles of mean wind speed and typical wind turbulence quantities, i.e., gust factor, turbulence intensity, integral length scale, etc., are demonstrated and compared against provisions stipulated in wind load codes. The effects of thermal stratification on these quantities are stressed.
Highlights Investigated typhoon wind over a built-up terrain based on a 356-m gradient tower. Examined thermal/in-homogenous effects on characteristics of wind quantities. Comparison of observations and provisions in wind load codes. Both upward and downward wind components were observed during TC passage.
Observation of Typhoon Hato based on the 356-m high meteorological gradient tower at Shenzhen
Luo, Y.P. (author) / Fu, J.Y. (author) / Li, Q.S. (author) / Chan, P.W. (author) / He, Y.C. (author)
2020-10-05
Article (Journal)
Electronic Resource
English
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