STUDY ON PROPAGATION CHARACTERISTICS OF TYPHOON WAVES IN MULTI-ISLAND SEA

Dong Weiliang; Huang Shichang; Huang Junbao; Shao Jie; Yao Wenwei

doi:10.19912/j.0254-0096.tynxb.2024-1178

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 1-10. DOI: 10.19912/j.0254-0096.tynxb.2024-1178

STUDY ON PROPAGATION CHARACTERISTICS OF TYPHOON WAVES IN MULTI-ISLAND SEA

Dong Weiliang¹, Huang Shichang¹, Huang Junbao¹, Shao Jie^1,2, Yao Wenwei¹

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Abstract

To enhance the prediction accuracy of waves in multi-island sea regions, this study uses the measured wave data of 57 typhoons in the Yangtze River Estuary and the coastal waters of Zhejiang Province from 1987 to 2022 to investigate the attenuation coefficients of wave height in various sea areas through data processing and analysis. The leef-sheltering coefficients is employed to quantify the influence of reef location, size and other factors on the average periods of mixed waves. Based on the measured wave height-period relationship of mixed waves, a method for determining the maximum and minimum periods of mixed waves is proposed. Finally, the friction coefficient of the wave bottom in the study area is calculated by using theoretical formulas. As shown in the results, the wave height gradually diminishes during the wave propagation towards the inshore, and the wave energy attenuates more rapidly in the areas with numerous islands than in open areas without islands. In a multi-island sea area, the period of mixed waves will gradually decrease under the effect of reef shielding, while the degree of period reduction increases with the increase of the reef shielding degree. For a certain wave height, the wave-period relationship of the strong wave direction at offshore stations can be regarded as the maximum possible period of the mixed wave, while the wave-period relationship of the wind waves can be taken as the minimum possible period of the mixed wave. As demonstrated in the calculation, in the Yangtze River Estuary and the near-shore regions of Zhejiang Province, the wave bottom friction coefficient Cb is 0.050 m²/s³, and the bottom friction coefficient f is 0.009.

Key words

wave energy / buoys / friction / wave period / island sheltering / typhoon wave / attenuation

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Dong Weiliang, Huang Shichang, Huang Junbao, Shao Jie, Yao Wenwei. STUDY ON PROPAGATION CHARACTERISTICS OF TYPHOON WAVES IN MULTI-ISLAND SEA[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 1-10 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1178

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