Wind and Structures

  • 제19권3호
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  • Pages.249-270
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  • 2014
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Wind characteristics observed in the vicinity of tropical cyclones: An investigation of the gradient balance and super-gradient flow

  • Tse, K.T. (Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology) ;
  • Li, S.W. (CLP Power Wind/Wave Tunnel Facility, The Hong Kong University of Science and Technology) ;
  • Lin, C.Q. (Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology) ;
  • Chan, P.W. (Hong Kong Observatory)
  • 투고 : 2013.12.05
  • 심사 : 2014.06.16
  • 발행 : 2014.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

Through comparing the mean wind profiles observed overland during the passages of four typhoons, and the gradient wind speeds calculated based on the sea level pressure data provided by a numerical model, the present paper discusses, (a) whether the gradient balance is a valid assumption to estimate the wind speed in the height range of 1250 m ~ 1750 m, which is defined as the upper-level mean wind speed, in a tropical cyclone over land, and (b) if the super-gradient feature is systematically observed below the height of 1500 m in the tropical cyclone wind field over land. It has been found that, (i) the gradient balance is a valid assumption to estimate the mean upper-level wind speed in tropical cyclones in the radial range from the radius to the maximum wind (RMW) to three times the RMW, (ii) the super-gradient flow dominates the wind field in the tropical cyclone boundary layer inside the RMW and is frequently observed in the radial range from the RMW to twice the RMW, (iii) the gradient wind speed calculated based on the post-landfall sea level pressure data underestimates the overall wind strength at an island site inside the RMW, and (iv) the unsynchronized decay of the pressure and wind fields in the tropical cyclone might be the reason for the underestimation.

키워드

참고문헌

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  4. Investigation of Typhoon Wind Speed Records on Top of a Group of Buildings vol.8, pp.4, 2014, https://doi.org/10.21022/ijhrb.2019.8.4.313
  5. An Analytical Framework for the Investigation of Tropical Cyclone Wind Characteristics over Different Measurement Conditions vol.9, pp.24, 2014, https://doi.org/10.3390/app9245385