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Observation and numerical experiments for drag coefficient under typhoon wind forcing

Content Provider	Springer Nature Link
Author	Cao, Huiqiu Zhou, Liangming Li, Shuiqing Wang, Zhifeng
Copyright Year	2017
Abstract	This paper presents a study on drag coefficients under typhoon wind forcing based on observations and numerical experiments. The friction velocity and wind speed are measured at a marine observation platform in the South China Sea. Three typhoons: SOULIK (2013), TRAMI (2013) and FITOW (2013) are observed at a buoy station in the northeast sea area of Pingtan Island. A new parameterization is formulated for the wind drag coefficient as a function of wind speed. It is found that the drag coefficient (C $_{ d }$) increases linearly with the slope of 0.083×10$^{−3}$ for wind speed less than 24 m s$^{−1}$. To investigate the drag coefficient under higher wind conditions, three numerical experiments are implemented for these three typhoons using SWAN wave model. The wind input data are objective reanalysis datasets, which are assimilated with many sources and provided every six hours with the resolution of 0.125°×0.125°. The numerical simulation results show a good agreement with wave observation data under typhoon wind forcing. The results indicate that the drag coefficient levels off with the linear slope of 0.012×10$^{−3}$ for higher wind speeds (less than 34 m s$^{−1}$) and the new parameterization improvese the simulation accuracy compared with the Wu (1982) default used in SWAN.
Starting Page	35
Ending Page	41
Page Count	7
File Format	PDF
ISSN	16725182
Journal	Journal of Ocean University of China
Volume Number	16
Issue Number	1
e-ISSN	19935021
Language	English
Publisher	Science Press
Publisher Date	2017-01-08
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	drag coefficient SWAN high wind speed typhoon Oceanography Meteorology
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering

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