Impact of wind drag coefficients on wave simulation using SWAN model

Ding Lei; Yu Bo

doi:10.3969/j.issn.0253-4193.2017.11.002

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Ding Lei, Yu Bo. Impact of wind drag coefficients on wave simulation using SWAN model[J]. Haiyang Xuebao, 2017, 39(11): 14-23. doi: 10.3969/j.issn.0253-4193.2017.11.002

Citation:

Ding Lei, Yu Bo. Impact of wind drag coefficients on wave simulation using SWAN model[J]. Haiyang Xuebao, 2017, 39(11): 14-23. doi: 10.3969/j.issn.0253-4193.2017.11.002

Ding Lei, Yu Bo. Impact of wind drag coefficients on wave simulation using SWAN model[J]. Haiyang Xuebao, 2017, 39(11): 14-23. doi: 10.3969/j.issn.0253-4193.2017.11.002

Citation:

Ding Lei, Yu Bo. Impact of wind drag coefficients on wave simulation using SWAN model[J]. Haiyang Xuebao, 2017, 39(11): 14-23. doi: 10.3969/j.issn.0253-4193.2017.11.002

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Impact of wind drag coefficients on wave simulation using SWAN model

doi: 10.3969/j.issn.0253-4193.2017.11.002

Ding Lei¹,
Yu Bo²

1.
College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China;Tianjin Marine Environmental Protection and Restoration Technology Engineering Center, Tianjing 300457, China
2.
College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China

Received Date: 2016-11-08
Rev Recd Date: 2017-03-14

Abstract

Abstract

Impact of wind drag coefficients in SWAN model on wave simulation was studied in the paper. Sensitivity experiments were conducted under wind speed 14 m/s, 31.5 m/s and 50 m/s (representing the conditions of strong wind, strong tropical storm and strong typhoon, respectively). Haringvliet in Holland was chosen as experimental area. Results show that in shallow water (shallower than 20 m), the wind drag coefficient has little effect on significant wave height. When the wind speed reaches a certain speed, wave breaking becomes a major factor affecting the significant wave height. In deep water (deeper than 30 m), the effect of wind drag coefficients on significant wave height is still small in condition of strong wind. As the wind speed increases further, the influence of wind drag coefficients on significant wave height becomes obvious gradually. The wind drag coefficient and wind speed have little influence on mean wave period whereas the wave breaking affects it significantly. According to the results of sensitivity experiments, choice of wind drag coefficients in SWAN model is suggested as follows. When the wind waves in shallow water are simulated, the default wind drag coefficient in SWAN can be directly used. As for deep water case, the default wind drag coefficient can be applied in condition of strong wind. When the wind speed is higher, the default wind drag coefficient can be tested firstly, and then it can be modified in terms of the field data if needed.
- wind drag coefficient,
- SWAN model,
- wave simulation,
- significant wave height,
- mean wave period

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References(20)

References

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