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Article

Inversion of Wind-Stress Drag Coefficient in Simulating Storm Surges by Means of Regularization Technique

1
School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao 266100, China
2
College of Engineering, Ocean University of China, Qingdao 266100, China
3
Key Laboratory of Physical Oceanography (Ocean University of China), Ministry of Education, Ocean University of China, Qingdao 266100, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(19), 3591; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16193591
Received: 31 July 2019 / Revised: 18 September 2019 / Accepted: 23 September 2019 / Published: 25 September 2019
(This article belongs to the Special Issue Advances in Hazard, Risk and Disaster Management)
In this study, water levels observed at tide stations in the Bohai Sea, Yellow Sea, and East China Sea during Typhoons 7203 and 8509 were assimilated into a numerical assimilation storm surge model combined with regularization technique to study the wind-stress drag coefficient. The Tikhonov regularization technique with different regularization parameters was tested during the assimilation. Using the regularization technique, the storm surge elevations were successfully simulated in the whole sea areas during Typhoons 7203 and 8509. The storm surge elevations calculated with the regularization technique and the elevations calculated with independent point method were separately compared with the observed data. Comparison results demonstrated that the former was closer to the observed data. The regularization technique had the best performance when the regularization parameter was 100. The spatial distribution of the inverted drag coefficient, storm surge elevations, and the wind fields during both typhoons were presented. Simulated results indicated that the change of drag coefficient is more significant in the coastal regions of the Bohai Sea and north of the Yellow Sea. Further analysis showed that the rising water elevation in the Bohai Sea is mostly attributed to the influence of onshore winds, and the negative storm surge in the South Yellow Sea is mainly caused by offshore winds. View Full-Text
Keywords: storm surge; adjoint assimilation; regularization technique; typhoon; drag coefficient storm surge; adjoint assimilation; regularization technique; typhoon; drag coefficient
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MDPI and ACS Style

Xu, J.; Zhang, Y.; Lv, X.; Liu, Q. Inversion of Wind-Stress Drag Coefficient in Simulating Storm Surges by Means of Regularization Technique. Int. J. Environ. Res. Public Health 2019, 16, 3591. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16193591

AMA Style

Xu J, Zhang Y, Lv X, Liu Q. Inversion of Wind-Stress Drag Coefficient in Simulating Storm Surges by Means of Regularization Technique. International Journal of Environmental Research and Public Health. 2019; 16(19):3591. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16193591

Chicago/Turabian Style

Xu, Junli, Yuhong Zhang, Xianqing Lv, and Qiang Liu. 2019. "Inversion of Wind-Stress Drag Coefficient in Simulating Storm Surges by Means of Regularization Technique" International Journal of Environmental Research and Public Health 16, no. 19: 3591. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph16193591

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