Enhanced Circular Subregion Method in Typhoon Hazard Analysis
Publication: Journal of Structural Engineering
Volume 147, Issue 6
Abstract
The coastal region of China suffers from severe typhoons. Hazard mitigation and risk management require a good estimation of the typhoon wind speed. In this study, an enhanced circular subregion method (CSM) is proposed. The efforts are mainly made in three aspects. First, a new treatment is developed to model the observed central pressure difference better. Second, the appropriate size for the enhanced CSM is discussed. Studies indicate that 500 km is appropriate. Third, Nataf transformation is introduced to incorporate the correlations among typhoon key parameters in wind hazard estimation. The enhanced CSM combined with a typhoon wind field model is used to assess the typhoon hazard for nine cities located in the coastal region of mainland China. Results show the design wind speeds predicted by traditional CSM are lower than those by the enhanced CSM for nine cities with an averaged difference of 4.3% for 50-year and 4.9% for 100-year return periods. The maximum difference was 6.1% in Fuzhou for 100-year return periods. Results also show the consideration of correlations among typhoon key parameters results in a change of the design wind speed at less than 2% for nine cities. Note that the consideration of correlations may not be neglected in other countries.
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Data Availability Statement
All data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The support by the National Natural Science Foundation of China (Grant No. 51778546), 111 Project (Grant No. B18062), and the Science and Technology Development Program of Shandong Province (2018GGX104006) are greatly acknowledged.
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Journal of Structural Engineering
Volume 147 • Issue 6 • June 2021
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© 2021 American Society of Civil Engineers.
History
Received: Nov 13, 2019
Accepted: Jan 8, 2021
Published online: Mar 27, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 27, 2021
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