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Open AccessArticle

Response of Coastal Water in the Taiwan Strait to Typhoon Nesat of 2017

by Renhao Wu 1,2, Qinghua Yang 1,3, Di Tian 4, Bo Han 1,2, Shimei Wu 1,2 and Han Zhang 4,*
1
School of Atmospheric Sciences, and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Zhuhai 519082, China
2
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
3
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100039, China
4
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(11), 2331; https://doi.org/10.3390/w11112331
Received: 29 September 2019 / Revised: 28 October 2019 / Accepted: 4 November 2019 / Published: 7 November 2019
(This article belongs to the Section Hydraulics)
The oceanic response of the Taiwan Strait (TWS) to Typhoon Nesat (2017) was investigated using a fully coupled atmosphere-ocean-wave model (COAWST) verified by observations. Ocean currents in the TWS changed drastically in response to significant wind variation during the typhoon. The response of ocean currents was characterised by a flow pattern generally consistent with the Ekman boundary layer theory, with north-eastward volume transport being significantly modified by the storm. Model results also reveal that the western TWS experienced the maximum generated storm surge, whereas the east side experienced only moderate storm surge. Heat budget analysis indicated that surface heat flux, vertical diffusion, and total advection all contributed to changes in water temperature in the upper 30 m with advection primarily affecting lower depths during the storm. Momentum balance analysis shows that along-shore volume acceleration was largely determined by a combined effect of surface wind stress and bottom stress. Cross-shore directional terms of pressure gradient and Coriolis acceleration were dominant throughout the model run, indicating that the effect of the storm on geostrophic balance was small. This work provides a detailed analysis of TWS water response to typhoon passage across the strait, which will aid in regional disaster management. View Full-Text
Keywords: Taiwan Strait; Typhoon Nesat; coupled atmosphere-ocean-wave model; volume transport; momentum balance analysis; heat budget Taiwan Strait; Typhoon Nesat; coupled atmosphere-ocean-wave model; volume transport; momentum balance analysis; heat budget
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MDPI and ACS Style

Wu, R.; Yang, Q.; Tian, D.; Han, B.; Wu, S.; Zhang, H. Response of Coastal Water in the Taiwan Strait to Typhoon Nesat of 2017. Water 2019, 11, 2331.

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