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Profiles of mean wind and turbulence intensity during strong typhoon landfall
https://orcid.org/0000-0002-4034-0478
https://orcid.org/0000-0001-7489-923X
Abstract It is established that the mean wind in a typhoon structure is related to the typhoon intensity ΔP and the normalized distance D/R outer between the typhoon center and observation spot. To further investigate the influence of ΔP and D/R outer on extreme winds under typhoon conditions, field measurements of mean wind speeds U and turbulence intensities I u at different heights below 70 m during the strong typhoons Haitang, Matsa, and Khanun were carried out during the landing process along the southeast coastline of China. It was concluded based on analyses that the profiles of U and I u in typhoon conditions can be approximated by a power law. Furthermore, most of their exponents about mean wind α U and ones about turbulence intensity α Iu are significantly larger than the code value of 0.12 in terrain A. The α U and α Iu during the three strong typhoons fluctuated roughly before landing and linear stationary variation after landfall. After landing, α U decreased with U and ΔP for the three typhoons. α U increased with D during the typhoons Matsa and Khanun, whereas it decreased with D/R outer during Haitang. After landfall, α Iu decreased with ΔP and increased with D/R outer during Matsa and Khanun, whereas it varied in a converse manner during Haitang.
Highlights Field measurements of time-variant wind profiles during typhoon landfall were conducted. Typhoon wind profiles were statistically related to typhoon intensity and distance between typhoon center and observation site. Mean wind & turbulence profiles during typhoons approximated by power law are significantly different from local provisions.
Profiles of mean wind and turbulence intensity during strong typhoon landfall
https://orcid.org/0000-0002-4034-0478
https://orcid.org/0000-0001-7489-923X
Abstract It is established that the mean wind in a typhoon structure is related to the typhoon intensity ΔP and the normalized distance D/R outer between the typhoon center and observation spot. To further investigate the influence of ΔP and D/R outer on extreme winds under typhoon conditions, field measurements of mean wind speeds U and turbulence intensities I u at different heights below 70 m during the strong typhoons Haitang, Matsa, and Khanun were carried out during the landing process along the southeast coastline of China. It was concluded based on analyses that the profiles of U and I u in typhoon conditions can be approximated by a power law. Furthermore, most of their exponents about mean wind α U and ones about turbulence intensity α Iu are significantly larger than the code value of 0.12 in terrain A. The α U and α Iu during the three strong typhoons fluctuated roughly before landing and linear stationary variation after landfall. After landing, α U decreased with U and ΔP for the three typhoons. α U increased with D during the typhoons Matsa and Khanun, whereas it decreased with D/R outer during Haitang. After landfall, α Iu decreased with ΔP and increased with D/R outer during Matsa and Khanun, whereas it varied in a converse manner during Haitang.
Highlights Field measurements of time-variant wind profiles during typhoon landfall were conducted. Typhoon wind profiles were statistically related to typhoon intensity and distance between typhoon center and observation site. Mean wind & turbulence profiles during typhoons approximated by power law are significantly different from local provisions.
Profiles of mean wind and turbulence intensity during strong typhoon landfall
https://orcid.org/0000-0002-4034-0478
https://orcid.org/0000-0001-7489-923X
Abstract It is established that the mean wind in a typhoon structure is related to the typhoon intensity ΔP and the normalized distance D/R outer between the typhoon center and observation spot. To further investigate the influence of ΔP and D/R outer on extreme winds under typhoon conditions, field measurements of mean wind speeds U and turbulence intensities I u at different heights below 70 m during the strong typhoons Haitang, Matsa, and Khanun were carried out during the landing process along the southeast coastline of China. It was concluded based on analyses that the profiles of U and I u in typhoon conditions can be approximated by a power law. Furthermore, most of their exponents about mean wind α U and ones about turbulence intensity α Iu are significantly larger than the code value of 0.12 in terrain A. The α U and α Iu during the three strong typhoons fluctuated roughly before landing and linear stationary variation after landfall. After landing, α U decreased with U and ΔP for the three typhoons. α U increased with D during the typhoons Matsa and Khanun, whereas it decreased with D/R outer during Haitang. After landfall, α Iu decreased with ΔP and increased with D/R outer during Matsa and Khanun, whereas it varied in a converse manner during Haitang.
Highlights Field measurements of time-variant wind profiles during typhoon landfall were conducted. Typhoon wind profiles were statistically related to typhoon intensity and distance between typhoon center and observation site. Mean wind & turbulence profiles during typhoons approximated by power law are significantly different from local provisions.
Profiles of mean wind and turbulence intensity during strong typhoon landfall
Yi, Guixiang (author) / Pan, Jingjing (author) / Zhao, Lin (author) / Song, Lili (author) / Fang, Genshen (author) / Cui, Wei (author) / Ge, Yaojun (author)
2022-07-19
Article (Journal)
Electronic Resource
English
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